Calculation method, system and equipment for biogas slurry and chemical fertilizer compound fertilization for rice planting and medium

Abstract

The invention relates to the technical field of biogas slurry returning-to-field fertilization, and discloses a calculation method, system, equipment and medium for biogas slurry and chemical fertilizer compound fertilization for rice planting. By comprehensively quantifying the basic fertilizer supply capacity of soil, the nutrient content of biogas slurry and the nutrient requirement of rice in the whole growth period, precise and balanced combined application of biogas slurry and chemical fertilizer is achieved; the method can overcome the defects that in the prior art, the recommended biogas slurry dosage is wide, dynamic supply of soil nutrients is neglected, and overall planning of the whole growth period is lacked, fertilizer damage is effectively avoided, the fertilizer utilization efficiency is improved, a set of scientific and systematic biogas slurry fertilization solution with high operability is provided for rice planting, and economic and environmental benefits are both achieved.

Description

Technical Field

[0001] This invention relates to the field of biogas slurry fertilization technology, and in particular to a calculation method, system, equipment and medium for compound fertilization of biogas slurry fertilizer for rice cultivation. Background Technology

[0002] As a byproduct of biogas projects, biogas slurry not only contains a large amount of nutrients such as nitrogen, phosphorus, potassium, and organic matter, but also micronutrients such as zinc, copper, iron, and calcium, as well as secondary metabolites beneficial to plant growth, such as vitamins, hormones, and active enzymes, making it a high-quality organic fertilizer resource. Numerous studies have confirmed that biogas slurry fertilization can improve soil quality, enhance crop quality, and increase crop yields and income. In production practice, biogas slurry produced by biogas plants can be applied locally to various planting systems in surrounding fields, facilities, and orchards. In January 2025, the State Administration for Market Regulation issued the "Technical Specifications for Returning Livestock and Poultry Manure to the Field," which recommends the application rate of liquid manure, including biogas slurry, on different crops. Prior to this, many regions had also issued their own local standards for returning biogas slurry to the field to guide local agricultural production using biogas slurry fertilization. However, in actual production, biogas slurry fertilization still faces many problems. For example, different types of biogas slurry have different nutrients, making it difficult for users to determine the appropriate dosage. In addition, the nutrients in biogas slurry are not balanced, and applying biogas slurry alone not only cannot increase production, but may also cause fertilizer damage due to excessive dosage. It is usually necessary to mix it with chemical fertilizers to balance the application of nutrients.

[0003] Rice cultivation is one of the important sites for returning biogas slurry to the field. Compared with facility cultivation and fruit tree planting, the application of biogas slurry in rice fields requires less sophisticated equipment and is convenient to apply. Biogas slurry can be used for fertilization through conventional pipeline irrigation. This method has been widely used in rice-producing areas from southern my country to the Yangtze River Delta. Anhui Province's local standards recommend a biogas slurry dosage of 4.5 to 22.5 tons per mu (approximately 0.067 hectares) for rice cultivation based on its nitrogen content. Similarly, Jiangsu Province's rice-wheat rotation system recommends that biogas slurry can replace 40% to 50% of nitrogen in rice cultivation. Hubei Province proposes that biogas slurry can be used as a base fertilizer, recommending a dosage of no more than 20 tons per mu. These local technical regulations are all based on local production experience and the nitrogen requirements of rice. Although they mention supplemental fertilization with chemical fertilizers, they lack further explanation and do not consider the availability of nutrients from the soil itself. The recommended dosage range for biogas slurry is too broad. Some existing methods of compounding biogas slurry with chemical fertilizers assess soil nutrient supply solely through soil fertility grading, without considering straw return to the field, which has a significant impact on soil nitrogen and potassium supply. The calculation methods are still relatively crude. On the other hand, the compounding of chemical fertilizers only reflects the supplementation of nutrients from biogas slurry, without considering the allocation of fertilizers during the growing season, and lacks a holistic fertilization plan design. Summary of the Invention

[0004] This invention provides a calculation method, system, equipment, and medium for compound fertilization of biogas slurry fertilizer in rice cultivation, in order to overcome the deficiencies of the prior art.

[0005] This invention provides a calculation method for compound fertilization of biogas slurry fertilizer in rice cultivation, comprising: Acquire soil data, fertilization data for rice cultivation, biogas slurry data to be applied, and planting data for the target rice variety to be planted in the target area. Based on the soil data of the target planting area, the nitrogen supply per unit area of ​​soil in the target planting area is obtained; Based on the nitrogen supply per unit area of ​​soil in the target planting area, the fertilization data of rice planting, and the planting data of the target rice, the amount of pure nitrogen applied per unit area in the target planting area is obtained. Based on the amount of pure nitrogen applied per unit area in the target planting area, the fertilization data for rice planting, and the data on biogas slurry to be applied, the amount of biogas slurry applied per unit area in the target planting area is obtained. Based on the amount of pure nitrogen applied per unit area in the target planting area and the fertilization data of rice planting, the amount of supplemental nitrogen fertilizer for the target rice throughout its entire growth period is obtained. Based on the soil data of the target planting area, the phosphorus supply per unit area and potassium supply per unit area of ​​the soil in the target planting area are obtained; Based on the phosphorus and potassium supply per unit area of ​​soil in the target planting area, as well as the planting data of the target rice and the fertilization data of rice planting, the phosphorus and potassium application per unit area of ​​the target planting area are obtained. Based on the phosphorus application rate per unit area, the biogas slurry application rate per unit area, and the biogas slurry data to be applied in the target planting area, the amount of supplemental phosphorus fertilizer for planting the target rice in the target planting area is obtained. Based on the potassium application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied and the fertilization data for rice planting, the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area is obtained.

[0006] According to the present invention, a calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation is provided. Soil data for the target planting area include any one or any combination of the following: soil available nitrogen content, soil pH value, soil organic matter content, soil available phosphorus content, and soil available potassium content; The data for the biogas slurry to be applied include any one or any combination of the following: total nitrogen content, total phosphorus content, and total potassium content; The planting data for the target rice includes any one or any combination of the following: the type of target rice, the target yield of the target rice, the nitrogen requirement for obtaining 100 kg of target rice yield, the phosphorus requirement for obtaining 100 kg of target rice yield, and the potassium requirement for obtaining 100 kg of target rice yield. Fertilization data for rice cultivation includes any one or any combination of the following: nitrogen use efficiency, the proportion of nitrogen fertilizer as base fertilizer, phosphorus use efficiency, potassium use efficiency, previous crop conditions, and the rate of biogas slurry replacing chemical fertilizers.

[0007] According to the present invention, a calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation is provided, wherein obtaining the nitrogen supply per unit area of ​​soil in the target planting area based on soil data of the target planting area includes: Based on soil data from the target planting area, the nitrogen supply per unit area of ​​soil in the target planting area is obtained using the first expression and the first constraint condition. The first expression is: , In the formula, N S Nitrogen supply per unit area of ​​soil, expressed in kg N / mu, where AN is the soil available nitrogen content, and β pH β is the soil pH correction factor, SOM is the soil organic matter content, and β is the soil pH correction factor. Npc This is the correction factor for the previous crop.

[0008] The first constraint is: When SOM-2≤0 in the first expression, SOM-2=0; According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation is provided. The method involves obtaining the amount of pure nitrogen applied per unit area of ​​the target planting area based on the soil nitrogen supply per unit area of ​​the target planting area, fertilization data for rice cultivation, and planting data of the target rice. This includes: Based on the soil nitrogen supply per unit area in the target planting area, fertilization data for rice cultivation, and planting data for the target rice, the amount of pure nitrogen applied per unit area in the target planting area is obtained using the second expression. The second expression is: , In the formula, N ar The amount of pure nitrogen applied per unit area, expressed in kg N / mu. r100 Let Y be the nitrogen requirement for achieving the target yield of 100 kg of rice, and N be the target yield of the target rice. S E represents the amount of nitrogen supplied to the soil per unit area. N Nitrogen utilization efficiency.

[0009] According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation is provided, wherein the step of obtaining the amount of biogas slurry applied per unit area of ​​the target planting area based on the amount of pure nitrogen applied per unit area of ​​the target planting area, fertilization data for rice cultivation, and biogas slurry data to be applied includes: Based on the amount of pure nitrogen applied per unit area in the target planting area, fertilization data for rice cultivation, and data on the amount of biogas slurry to be applied, the amount of biogas slurry applied per unit area in the target planting area is obtained using the third expression, where the third expression is: , In the formula, V BS This refers to the amount of biogas slurry applied per unit area, expressed in tons per acre (N). ar The amount of pure nitrogen applied per unit area, NF b R represents the proportion of nitrogen fertilizer as base fertilizer. N To determine the rate at which biogas slurry replaces chemical fertilizer, N BS The nitrogen content in biogas slurry, β BS This is the correction factor for biogas slurry usage.

[0010] According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation, wherein the method for obtaining the amount of supplemental nitrogen fertilizer for the entire growth period of the target rice based on the amount of pure nitrogen applied per unit area of ​​the target planting area and the fertilization data of rice cultivation includes: Based on the amount of pure nitrogen applied per unit area in the target planting area and the fertilization data for rice cultivation, the application rates of urea as basal fertilizer, urea during the tillering stage, and urea during the panicle stage are obtained using the fourth, fifth, and sixth expressions. The fourth expression is as follows: , The fifth expression is: , The sixth expression is: , In the formula, UR b For the application rate of urea as base fertilizer, UR t Urea application rate during tillering stage, URs represents urea application rate under panicle fertilizer, and N... ar The amount of pure nitrogen applied per unit area, NF b R represents the proportion of nitrogen fertilizer as base fertilizer. N The rate at which biogas slurry replaces chemical fertilizer.

[0011] According to the present invention, a calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation is provided, wherein the step of obtaining the phosphorus supply per unit area and the potassium supply per unit area of ​​soil in the target planting area based on soil data of the target planting area includes: Based on soil data from the target planting area, the phosphorus and potassium supply per unit area of ​​soil in the target planting area are obtained using expressions seven and eight. Expression seven is as follows: , The eighth expression is: , In the formula, P S Phosphorus supply per unit area of ​​soil, expressed in kg P2O5 / mu. AP represents the available phosphorus content in the soil. S The value represents the amount of potassium supplied to the soil per unit area, expressed in kg K2O / mu. AK represents the available potassium content in the soil.

[0012] According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation is provided. The method involves obtaining the phosphorus and potassium application rates per unit area of ​​the target planting area based on the soil phosphorus and potassium supply per unit area, the target rice planting data, and the rice cultivation fertilization data. The method includes: Based on the phosphorus and potassium supply per unit area of ​​soil in the target planting area, as well as the planting data and fertilization data for the target rice, the phosphorus and potassium application rates per unit area of ​​the target planting area are obtained using expressions nine and ten. Expression nine is as follows: , The tenth expression is: , In the formula, P ar The phosphorus application rate is expressed in kg P2O5 / mu. r100 To obtain the phosphorus requirement for every 100 kilograms of target rice yield, P S E represents the amount of phosphorus supplied per unit area of ​​soil. P For phosphorus utilization efficiency, K ar Potassium application rate per unit area, expressed in kgK2O / mu (kgK2O / mu). r100 To determine the potassium requirement for achieving the target rice yield of 100 kilograms, K S E represents the amount of potassium supplied per unit area of ​​soil. K For potassium utilization efficiency, β Kst denoted as the straw return-to-field correction coefficient, and Y represents the target yield for rice cultivation.

[0013] According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation includes obtaining the supplemental phosphorus fertilizer amount for planting the target rice in the target planting area based on the phosphorus application rate per unit area, the biogas slurry application rate per unit area, and the biogas slurry data to be applied in the target planting area. Based on the phosphorus application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied, the supplementary phosphorus fertilizer amount for planting the target rice in the target planting area is obtained using the eleventh expression and the second constraint. The eleventh expression is as follows: , In the formula, CS b To supplement the amount of phosphate fertilizer (the amount of superphosphate applied), P ar V is the phosphorus application rate per unit area. BS P is the amount of biogas slurry applied per unit area. BS The phosphorus content in biogas slurry; The second constraint is: When P in the eleventh expression ar ≤V BS ×P BS When the ratio is ×1000, the amount of phosphate fertilizer to be supplemented is 0.

[0014] According to the present invention, a method for calculating the compound application of biogas slurry fertilizer for rice cultivation is provided. The method involves obtaining the required amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area based on the potassium application rate per unit area, the biogas slurry application rate per unit area, the biogas slurry data to be applied, and the fertilization data for rice cultivation in the target planting area. The method includes: Based on the potassium application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied and the fertilization data for rice cultivation, the supplementary potassium fertilizer amount for the entire growth period of the target rice in the target planting area is obtained using the twelfth expression and the third constraint. The twelfth expression is: , , In the formula, KC b K represents the amount of potassium chloride applied as base fertilizer, KCs represents the amount of potassium chloride applied as top dressing, and K represents the amount of potassium chloride applied as top dressing. ar Potassium application rate per unit area, KF b V represents the proportion of nitrogen fertilizer as base fertilizer. BS K is the amount of biogas slurry applied per unit area. BS Potassium content in biogas slurry; The third constraint is: When K in the twelfth expression ar ≤V BS ×K BS When ×1000, the amount of potassium fertilizer supplemented during the complete growth period of the target rice in the target planting area is 0, and when K in the twelfth expression... ar × K Fb ≤ V BS × K BS ×1000≤ K ar At that time, KCb =0, the KCs formula is modified as follows: , In the formula, KCs' is the amount of potassium chloride applied as top dressing, and K ar V is the amount of potassium applied per unit area. BS K is the amount of biogas slurry applied per unit area. BS This refers to the potassium content in the biogas slurry.

[0015] This invention also provides a calculation system for compound fertilization of biogas slurry fertilizer in rice cultivation, comprising: The data acquisition module is used to: acquire soil data of the target planting area, fertilization data of rice planting, biogas slurry data to be applied, and planting data of the target rice to be planted in the target planting area; The module for obtaining soil nitrogen supply per unit area is used to: obtain the soil nitrogen supply per unit area of ​​the target planting area based on soil data of the target planting area; The module for obtaining the amount of pure nitrogen applied per unit area is used to: obtain the amount of pure nitrogen applied per unit area in the target planting area based on the soil nitrogen supply per unit area of ​​the target planting area, the fertilization data of rice planting, and the planting data of the target rice. The module for obtaining the amount of biogas slurry applied per unit area is used to: obtain the amount of biogas slurry applied per unit area of ​​the target planting area based on the amount of pure nitrogen applied per unit area of ​​the target planting area, the fertilization data of rice planting, and the data of biogas slurry to be applied. The module for obtaining the amount of nitrogen fertilizer supplementation is used to: obtain the amount of nitrogen fertilizer supplementation for the entire growth period of the target rice based on the amount of pure nitrogen applied per unit area of ​​the target planting area and the fertilization data of rice planting. The module for obtaining phosphorus / potassium supply per unit area of ​​soil is used to: obtain the phosphorus supply per unit area of ​​soil and the potassium supply per unit area of ​​soil in the target planting area based on soil data of the target planting area; The module for obtaining phosphorus / potassium application per unit area is used to: obtain the phosphorus and potassium application per unit area of ​​the target planting area based on the phosphorus and potassium supply per unit area of ​​the soil in the target planting area, as well as the planting data and fertilization data of the target rice. The module for obtaining the amount of supplemental phosphate fertilizer is used to: obtain the amount of supplemental phosphate fertilizer for planting the target rice in the target planting area based on the amount of phosphate applied per unit area, the amount of biogas slurry applied per unit area, and the data on the biogas slurry to be applied in the target planting area. The module for obtaining supplemental potassium fertilizer is used to: obtain the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area based on the amount of potassium applied per unit area, the amount of biogas slurry applied per unit area, the data on biogas slurry to be applied, and the fertilization data for rice planting in the target planting area.

[0016] The present invention also provides an electronic device, including a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the calculation method for compound application of biogas slurry fertilizer for rice cultivation as described above.

[0017] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the calculation method for compound application of biogas slurry fertilizer for rice cultivation as described above.

[0018] The present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute any of the above-described calculation methods for compound application of biogas slurry fertilizer for rice cultivation.

[0019] The present invention provides a calculation method, system, equipment, and medium for compound fertilization of biogas slurry fertilizer in rice cultivation, which has at least the following beneficial effects: This invention achieves a quantitative assessment of the soil's nitrogen, phosphorus, and potassium supply capacity by comprehensively acquiring soil data, biogas slurry characteristics, and rice cultivation requirements of the target planting area, overcoming the limitations of existing technologies that rely solely on soil fertility classification or rough estimation. In particular, by quantifying the impact of straw return to the field on soil nutrient supply, it significantly improves the accuracy and scientific rigor of biogas slurry and fertilizer application.

[0020] This invention dynamically determines the amount of fertilizer to be supplemented at different growth stages by calculating the fertilizer requirements for nitrogen, phosphorus, and potassium separately and the nutrient contribution of biogas slurry, ensuring a balanced supply of nutrients throughout the entire growth period of rice. This not only avoids the nutrient imbalance or fertilizer damage that may result from the sole application of biogas slurry, but also generates customized fertilization plans based on the specific soil conditions and crop needs of each field.

[0021] This invention provides a complete method from data input to fertilizer dosage calculation, which can be integrated into computing systems, devices, or media for easy application by farmers or agricultural technicians. Through a standardized calculation process, it addresses the problem of existing local standards having a wide range of biogas slurry dosages and lacking specific application guidance, making it suitable for planting scenarios in different regions, with different soil types, and for different rice varieties.

[0022] This invention optimizes the ratio of biogas slurry to chemical fertilizer, maximizing the organic fertilizer effect of biogas slurry while reducing excessive use of chemical fertilizers, thus mitigating the risk of agricultural non-point source pollution and aligning with the requirements of green agriculture and sustainable development. Simultaneously, it improves the efficiency of biogas slurry resource utilization, supporting the development of circular agriculture.

[0023] This invention not only focuses on the combined application of biogas slurry and chemical fertilizer during the basal fertilizer stage, but also takes into account the nutrient requirements and distribution throughout the entire growth period of rice, forming a systematic fertilization plan. This makes up for the shortcomings of existing technologies that only supplement without overall planning, and helps to achieve the unity of high yield, high quality and economical fertilization of rice. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating a calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation, provided by the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of a calculation system for compound application of biogas slurry fertilizer in rice cultivation, provided by the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Figure 1 This is a flowchart illustrating a calculation method for compound fertilization with biogas slurry fertilizer in rice cultivation, provided by the present invention. The execution entity of this calculation method for compound fertilization with biogas slurry fertilizer in rice cultivation can be any suitable terminal-side device or network-side device, such as a calculation device for compound fertilization with biogas slurry fertilizer in rice cultivation.

[0030] See Figure 1 The present invention provides a calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation, which may include: S110. Obtain soil data, fertilization data for rice planting, biogas slurry data to be applied, and planting data for the target rice to be planted in the target planting area.

[0031] In one embodiment, before rice planting and after the previous crop harvest, soil data, biogas slurry data to be applied, and planting data of the target rice to be planted in the target planting area can be collected. For example, soil samples of 0-20cm can be collected at at least 5 points in the target planting area and thoroughly mixed for soil data measurement, while 500ml of fresh biogas slurry from the biogas station can be collected for biogas slurry data measurement.

[0032] Specifically, soil data for the target planting area includes any one or any combination of the following: soil available nitrogen content, soil pH value, soil organic matter content, soil available phosphorus content, and soil available potassium content. Data on the biogas slurry to be applied includes any one or any combination of the following: total nitrogen content, total phosphorus content, and total potassium content. Planting data for the target rice includes any one or any combination of the following: type of target rice (e.g., single-season rice, early rice, late rice, hybrid single-season rice, hybrid early rice, hybrid late rice), nitrogen requirement per 100 kg of target rice yield, target yield of target rice, phosphorus requirement per 100 kg of target rice yield, and potassium requirement per 100 kg of target rice yield. Fertilization data for rice planting includes any one or any combination of the following: nitrogen use efficiency, proportion of nitrogen fertilizer as basal fertilizer, phosphorus use efficiency, potassium use efficiency, previous crop conditions, and biogas slurry substitution rate for chemical fertilizers.

[0033] S120. Based on the soil data of the target planting area, the nitrogen supply per unit area of ​​the soil in the target planting area is obtained using the first expression and the first constraint conditions. This embodiment considers that the nitrogen-to-phosphorus ratio in the biogas slurry is higher than that absorbed by the crop; therefore, the calculation of biogas slurry usage is based on nitrogen, starting from nitrogen supply and demand. When calculating the soil nitrogen supply, in addition to the nitrogen content in the soil itself, the influence of soil pH, the influence of soil organic matter mineralization, and the influence of the previous crop must also be considered, taking into account various factors.

[0034] The first expression is: , In the formula, N S Nitrogen supply per unit area of ​​soil, expressed in kg N / mu, where AN is the soil available nitrogen content, and β pH β is the soil pH correction factor, which is applied when soil pH is 5.5 ≤ pH ≤ 8.5. pH = 1, outside this range, β pH = 0.75, SOM is soil organic matter content, β Npcβ is the correction factor for the previous crop. When the previous crop is Gramineae and is returned to the field in situ, β Npc = 0.8, when the current crop is legumes, β Npc = 1.2, except for the cases mentioned above, β Npc = 1.0.

[0035] The first constraint is: When SOM-2≤0 in the first expression, SOM-2=0; S130. Based on the soil nitrogen supply per unit area of ​​the target planting area, the fertilization data for rice cultivation, and the planting data of the target rice, the amount of pure nitrogen applied per unit area of ​​the target planting area is obtained using the second expression, wherein the second expression is: , In the formula, N ar The amount of pure nitrogen applied per unit area, expressed in kg N / mu. r100 The nitrogen requirement for achieving the target rice yield per 100 kg varies depending on the rice planting type, as detailed in Table 1. Y represents the target yield of the target rice, ranging from 300 to 750, which can be determined based on the local average rice yield. N... S E represents the amount of nitrogen supplied to the soil per unit area. N The nitrogen use efficiency ranges from 35% to 45%.

[0036]

[0037] S140. Based on the amount of pure nitrogen applied per unit area in the target planting area, the fertilization data for rice cultivation, and the data on the biogas slurry to be applied, the amount of biogas slurry applied per unit area in the target planting area is obtained using the third expression. In this embodiment, biogas slurry is preferably used as a base fertilizer and applied after the previous crop is harvested. The impact of whether or not straw is returned to the field on nitrogen utilization is also taken into consideration.

[0038] The third expression is: , In the formula, V BS This refers to the amount of biogas slurry applied per unit area, expressed in tons per acre (N). ar The amount of pure nitrogen applied per unit area, NF b The proportion of nitrogen fertilizer as base fertilizer ranges from 40% to 50%. N For the rate at which biogas slurry replaces chemical fertilizer, 0 ≤ R N ≤ 80%, recommended range is 30% ~ 70%, N BS The nitrogen content in biogas slurry, β BS β is the correction factor for biogas slurry usage. When the previous crop straw is returned to the field, β BS= 0.60, when there is no straw return to the field, β BS = 0.85.

[0039] S150. Based on the amount of pure nitrogen applied per unit area in the target planting area and the fertilization data for rice planting, the application rates of urea as basal fertilizer, urea during the tillering stage, and urea during the heading stage are obtained using the fourth, fifth, and sixth expressions. In this embodiment, urea is the preferred nitrogen fertilizer, and topdressing is carried out during the tillering and heading stages, accounting for 55% and 45% respectively.

[0040] The fourth expression is: , The fifth expression is: , The sixth expression is: , In the formula, UR b For the application rate of urea as base fertilizer, UR t Urea application rate during tillering stage, URs represents urea application rate under panicle fertilizer, and N... ar The amount of pure nitrogen applied per unit area, NF b R represents the proportion of nitrogen fertilizer as base fertilizer. N To determine the rate at which biogas slurry replaces chemical fertilizer, N ar NF b R N The value is consistent with step S140.

[0041] S160. Based on the soil data of the target planting area, the phosphorus supply per unit area and potassium supply per unit area of ​​the soil in the target planting area are obtained using the seventh and eighth expressions. The seventh expression is: , The eighth expression is: , In the formula, P S Phosphorus supply per unit area of ​​soil, expressed in kg P2O5 / mu. AP represents the available phosphorus content in the soil. S The value represents the amount of potassium supplied to the soil per unit area, expressed in kg K2O / mu. AK represents the available potassium content in the soil.

[0042] S170. Based on the phosphorus and potassium supply per unit area of ​​soil in the target planting area, as well as the planting data and fertilization data of the target rice, the phosphorus (P2O5) and potassium (K2O) application rates per unit area in the target planting area are obtained using expressions nine and ten. Expression nine is as follows: , The tenth expression is: , In the formula, P ar The phosphorus application rate is expressed in kg P2O5 / mu. r100 To obtain the phosphorus requirement for every 100 kilograms of target rice yield, P S E represents the amount of phosphorus supplied per unit area of ​​soil. P Phosphorus utilization efficiency, ranging from 50% to 60%, K ar Potassium application rate per unit area, expressed in kg K2O / mu. r100 To determine the potassium requirement for achieving the target rice yield of 100 kilograms, K S E represents the amount of potassium supplied per unit area of ​​soil. K Potassium utilization efficiency, ranging from 50% to 60%, β Kst β is the straw return correction factor, which is used when rice is planted in the previous crop and straw is returned to the field. Kst = 0.7, β without straw return to the field Kst = 1.0, Y is the target yield for rice cultivation, ranging from 300 to 750, P r100 and K r100 The differences vary depending on the type of rice cultivation, as detailed in Table 1.

[0043] S180. Based on the phosphorus application rate per unit area and the biogas slurry application rate per unit area of ​​the target planting area, as well as the biogas slurry data to be applied, the supplementary phosphorus fertilizer amount for planting the target rice in the target planting area is obtained using the eleventh expression and the second constraint. In this embodiment, superphosphate is preferred as the phosphorus fertilizer and is applied as a base fertilizer in one application.

[0044] The eleventh expression is: , In the formula, CS b To supplement the amount of phosphate fertilizer (the amount of superphosphate applied), P ar V is the phosphorus application rate per unit area. BS P is the amount of biogas slurry applied per unit area. BS The phosphorus content in biogas slurry; The second constraint is: When P in the eleventh expression ar ≤V BS ×P BS When the value is ×1000, it means that the amount of phosphorus introduced into the biogas slurry is higher than the required amount of phosphate fertilizer, i.e., CS b If the concentration is ≤ 0, then no additional phosphate fertilizer is needed, and the amount of phosphate fertilizer to be supplemented is 0.

[0045] S190. Based on the amount of potassium applied per unit area and the amount of biogas slurry applied per unit area in the target planting area, as well as the data on the biogas slurry to be applied and the fertilization data for rice planting, the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area is obtained using the twelfth expression and the third constraint. In this embodiment, potassium chloride is preferably used as the potassium fertilizer, and it is used as the base fertilizer and the panicle fertilizer.

[0046] The twelfth expression is: , , In the formula, KC b K represents the amount of potassium chloride applied as base fertilizer, KCs represents the amount of potassium chloride applied as top dressing, and K represents the amount of potassium chloride applied as top dressing. ar Potassium application rate per unit area, KF b The proportion of nitrogen fertilizer as base fertilizer ranges from 50% to 60%. BS K is the amount of biogas slurry applied per unit area. BS Potassium content in biogas slurry; The third constraint is: Before calculation, it is necessary to determine the relationship between the amount of potassium introduced into the biogas slurry and the amount of potassium to be applied. ar × K Fb ≥ V BS ×K BS When × 1000, the twelfth expression can be used for calculation; when K in the twelfth expression ar ≤V BS ×K BS When ×1000, the amount of potassium fertilizer supplemented during the complete growth period of the target rice in the target planting area is 0, and when K in the twelfth expression... ar ×K Fb ≤ V BS × K BS ×1000≤ K ar At that time, KC b =0, the KCs formula is modified as follows: , In the formula, KCs' is the amount of potassium chloride applied as top dressing, and K ar V is the amount of potassium applied per unit area. BS K is the amount of biogas slurry applied per unit area. BS This refers to the potassium content in the biogas slurry.

[0047] The following is a specific application example to illustrate the calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation provided by the present invention.

[0048] In a rice-growing area in South China, it is planned to use biogas slurry from a nearby pig farm's biogas plant as base fertilizer to replace part of the chemical fertilizer. The physicochemical properties of the paddy field soil were measured after the early rice harvest as follows: available nitrogen 140 mg / kg, organic matter 3.51%, available phosphorus 24.97 mg / kg, available potassium 48.32 mg / kg, pH 5.62. Simultaneously, the biogas slurry samples were analyzed as follows: total nitrogen 0.113%, total phosphorus 0.050%, and total potassium 0.066%. The rice variety to be planted is Xiangzhu Xiangsimiao, a conventional late-season rice; the annual yield is typically 400-500 kg / mu, therefore the target yield is set at 500 kg / mu (Y). The previous crop was early rice, and all straw was returned to the field. Based on the soil physicochemical properties, the calculated nitrogen supply to the soil is 5.74 kg N / mu (N S Nitrogen utilization rate is set at 40% (E). N The proportion of nitrogen fertilizer as base fertilizer is set at 50% (NF). b The biogas slurry replacement rate for chemical fertilizer is set at 60% (R). N The calculated amount of biogas slurry returned to the field is 5.65 tons / mu (V). BS At the same time, 6.95 kg / mu of urea needs to be added as base fertilizer (UR). b Based on the ratio of nitrogen basal fertilizer to topdressing, and the proportion of nitrogen fertilizer allocated during the tillering and heading stages, it is calculated that 7.46 kg / mu of urea (UR) is required during the tillering stage. t During the heading stage, apply 6.25 kg / mu (URs). Based on the available phosphorus and available potassium content in the soil of this region, the soil phosphorus supply is calculated to be 0.599 kg / mu (P). S The soil potassium supply is 7.24 kg / mu (K). S Further calculations based on rice's phosphorus and potassium requirements yielded a phosphorus application rate of 5.27 kg / mu (P). ar Potassium application rate: 11.23 kg / mu (K) ar Based on the amount of biogas slurry returned to the field, the calculated phosphorus and potassium content is 2.82 kg / mu and 3.72 kg / mu respectively. Therefore, a one-time application of superphosphate (CS20.4 kg / mu) is required as base fertilizer. b The ratio of potassium fertilizer in basal fertilizer and top dressing is set at 60% (KF). b Based on the calculations of 40% and 50%, the required base fertilizer supplement is 5.03 kg / mu of potassium chloride (KC). b The top dressing requires 7.49 kg / mu of potassium chloride (KCs).

[0049] This invention addresses four key factors in a selected rice-growing area: soil physicochemical properties (e.g., available nitrogen, organic matter, available phosphorus, available potassium, and pH), planting history (e.g., previous crop type and straw return status), nutrients to be applied via biogas slurry (e.g., total nitrogen, total phosphorus, and total potassium), and rice type. Based on the principle of quantitative nitrogen application and phosphorus and potassium supplementation, it constructs a precise fertilizer compounding calculation model for biogas slurry as base fertilizer, supplemented with chemical fertilizer, covering the rice tillering and heading stages. Applying this calculation method, a complete scientific fertilization plan for biogas slurry return and chemical fertilizer compounding throughout the rice growth cycle can be developed for specific regions. This guides growers in the rational, efficient, and accurate application of biogas slurry, while saving on chemical fertilizer input, avoiding nutrient waste, and promoting regional crop-livestock cycling.

[0050] The following describes the calculation system for compound fertilization of biogas slurry fertilizer for rice cultivation provided by the present invention. The calculation system for compound fertilization of biogas slurry fertilizer for rice cultivation described below can be referred to in correspondence with the calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation described above.

[0051] See Figure 2 The present invention provides a calculation system for compound fertilization of biogas slurry fertilizer in rice cultivation, which may include: The data acquisition module is used to: acquire soil data of the target planting area, fertilization data of rice planting, biogas slurry data to be applied, and planting data of the target rice to be planted in the target planting area; The module for obtaining soil nitrogen supply per unit area is used to: obtain the soil nitrogen supply per unit area of ​​the target planting area based on soil data of the target planting area; The module for obtaining the amount of pure nitrogen applied per unit area is used to: obtain the amount of pure nitrogen applied per unit area in the target planting area based on the soil nitrogen supply per unit area of ​​the target planting area, the fertilization data of rice planting, and the planting data of the target rice. The module for obtaining the amount of biogas slurry applied per unit area is used to: obtain the amount of biogas slurry applied per unit area of ​​the target planting area based on the amount of pure nitrogen applied per unit area of ​​the target planting area, the fertilization data of rice planting, and the data of biogas slurry to be applied. The module for obtaining the amount of nitrogen fertilizer supplementation is used to: obtain the amount of nitrogen fertilizer supplementation for the entire growth period of the target rice based on the amount of pure nitrogen applied per unit area of ​​the target planting area and the fertilization data of rice planting. The module for obtaining phosphorus / potassium supply per unit area of ​​soil is used to: obtain the phosphorus supply per unit area of ​​soil and the potassium supply per unit area of ​​soil in the target planting area based on soil data of the target planting area; The module for obtaining phosphorus / potassium application per unit area is used to: obtain the phosphorus and potassium application per unit area of ​​the target planting area based on the phosphorus and potassium supply per unit area of ​​the soil in the target planting area, as well as the planting data and fertilization data of the target rice. The module for obtaining the amount of supplemental phosphate fertilizer is used to: obtain the amount of supplemental phosphate fertilizer for planting the target rice in the target planting area based on the amount of phosphate applied per unit area, the amount of biogas slurry applied per unit area, and the data on the biogas slurry to be applied in the target planting area. The module for obtaining supplemental potassium fertilizer is used to: obtain the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area based on the amount of potassium applied per unit area, the amount of biogas slurry applied per unit area, the data on biogas slurry to be applied, and the fertilization data for rice planting in the target planting area.

[0052] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions stored in the memory 830 to execute the steps of the aforementioned calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation.

[0053] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0054] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to perform the steps of the above-described calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation.

[0055] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation.

[0056] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0057] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calculation method for compound fertilization of biogas slurry fertilizer used in rice cultivation, characterized in that, include: Acquire soil data, fertilization data for rice cultivation, biogas slurry data to be applied, and planting data for the target rice variety to be planted in the target area. Based on the soil data of the target planting area, the nitrogen supply per unit area of ​​soil in the target planting area is obtained; Based on the nitrogen supply per unit area of ​​soil in the target planting area, the fertilization data of rice planting, and the planting data of the target rice, the amount of pure nitrogen applied per unit area in the target planting area is obtained. Based on the amount of pure nitrogen applied per unit area in the target planting area, the fertilization data for rice planting, and the data on biogas slurry to be applied, the amount of biogas slurry applied per unit area in the target planting area is obtained. Based on the amount of pure nitrogen applied per unit area in the target planting area and the fertilization data of rice planting, the amount of supplemental nitrogen fertilizer for the target rice throughout its entire growth period is obtained. Based on the soil data of the target planting area, the phosphorus supply per unit area and potassium supply per unit area of ​​the soil in the target planting area are obtained; Based on the phosphorus and potassium supply per unit area of ​​soil in the target planting area, as well as the planting data of the target rice and the fertilization data of rice planting, the phosphorus and potassium application per unit area of ​​the target planting area are obtained. Based on the phosphorus application rate per unit area, the biogas slurry application rate per unit area, and the biogas slurry data to be applied in the target planting area, the amount of supplemental phosphorus fertilizer for planting the target rice in the target planting area is obtained. Based on the potassium application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied and the fertilization data for rice planting, the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area is obtained.

2. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 1, characterized in that, Soil data for the target planting area include any one or any combination of the following: soil available nitrogen content, soil pH value, soil organic matter content, soil available phosphorus content, and soil available potassium content; The data for the biogas slurry to be applied include any one or any combination of the following: total nitrogen content, total phosphorus content, and total potassium content; The planting data for the target rice includes any one or any combination of the following: the type of target rice, the target yield of the target rice, the nitrogen requirement for obtaining 100 kg of target rice yield, the phosphorus requirement for obtaining 100 kg of target rice yield, and the potassium requirement for obtaining 100 kg of target rice yield. Fertilization data for rice cultivation includes any one or any combination of the following: nitrogen use efficiency, the proportion of nitrogen fertilizer as base fertilizer, phosphorus use efficiency, potassium use efficiency, previous crop conditions, and the rate of biogas slurry replacing chemical fertilizers.

3. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 2, characterized in that, The step of obtaining the nitrogen supply per unit area of ​​soil in the target planting area based on soil data includes: Based on soil data from the target planting area, the nitrogen supply per unit area of ​​soil in the target planting area is obtained using the first expression and the first constraint condition. The first expression is: ， In the formula, Nitrogen supply per unit area of ​​soil, expressed in kgN / acre, where AN is the available nitrogen content in the soil, and β... pH β is the soil pH correction factor, SOM is the soil organic matter content, and β is the soil pH correction factor. Npc The correction factor is the previous crop's coefficient. The first constraint is: When SOM-2≤0 in the first expression, SOM-2=0; Furthermore, the step of obtaining the amount of pure nitrogen applied per unit area of ​​the target planting area based on the soil nitrogen supply per unit area of ​​the target planting area, the fertilization data of rice planting, and the planting data of the target rice includes: Based on the soil nitrogen supply per unit area in the target planting area, fertilization data for rice cultivation, and planting data for the target rice, the amount of pure nitrogen applied per unit area in the target planting area is obtained using the second expression. The second expression is: ， In the formula, N ar The amount of pure nitrogen applied per unit area, expressed in kg N / mu. r100 Let Y be the nitrogen requirement for achieving the target yield of 100 kg of rice, and N be the target yield of the target rice. S E represents the amount of nitrogen supplied to the soil per unit area. N Nitrogen utilization efficiency.

4. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 3, characterized in that, The method of obtaining the amount of biogas slurry applied per unit area of ​​the target planting area based on the amount of pure nitrogen applied per unit area of ​​the target planting area, fertilization data for rice planting, and data on the biogas slurry to be applied includes: Based on the amount of pure nitrogen applied per unit area in the target planting area, fertilization data for rice cultivation, and data on the amount of biogas slurry to be applied, the amount of biogas slurry applied per unit area in the target planting area is obtained using the third expression, where the third expression is: ， In the formula, V BS This refers to the amount of biogas slurry applied per unit area, expressed in tons per acre (N). ar The amount of pure nitrogen applied per unit area, NF b R represents the proportion of nitrogen fertilizer as base fertilizer. N To determine the rate at which biogas slurry replaces chemical fertilizer, N BS The nitrogen content in biogas slurry, β BS This is the correction factor for biogas slurry usage.

5. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 4, characterized in that, The method of obtaining the supplemental nitrogen fertilizer amount for the entire growth period of the target rice based on the amount of pure nitrogen applied per unit area of ​​the target planting area and the fertilization data of rice planting includes: Based on the pure nitrogen application rate per unit area in the target planting area and fertilization data for rice cultivation, the application rates of urea as basal fertilizer, urea during the tillering stage, and urea during the panicle stage are obtained using the fourth, fifth, and sixth expressions. The fourth expression is as follows: ， The fifth expression is: ， The sixth expression is: ， In the formula, UR b For the application rate of urea as base fertilizer, UR t Urea application rate during tillering stage, URs represents urea application rate under panicle fertilizer, and N... ar The amount of pure nitrogen applied per unit area, NF b R represents the proportion of nitrogen fertilizer as base fertilizer. N The rate at which biogas slurry replaces chemical fertilizer.

6. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 5, characterized in that, The step of obtaining the phosphorus supply per unit area and potassium supply per unit area of ​​soil in the target planting area based on soil data includes: Based on soil data from the target planting area, the phosphorus and potassium supply per unit area of ​​soil in the target planting area are obtained using expressions seven and eight. Expression seven is as follows: ， The eighth expression is: ， In the formula, P S Phosphorus supply per unit area of ​​soil, expressed in kg P2O5 / mu. AP represents the available phosphorus content in the soil. S The amount of potassium supplied to the soil per unit area is expressed in kg K2O / mu, and AK represents the available potassium content in the soil. Furthermore, the step of obtaining the phosphorus and potassium application rates per unit area of ​​the target planting area based on the soil phosphorus and potassium supply per unit area of ​​the target planting area, as well as the planting data and fertilization data of the target rice, includes: Based on the phosphorus and potassium supply per unit area of ​​soil in the target planting area, as well as the planting data and fertilization data for the target rice, the phosphorus and potassium application rates per unit area of ​​the target planting area are obtained using expressions nine and ten. Expression nine is as follows: ， The tenth expression is: ， In the formula, P ar The phosphorus application rate is expressed in kg P2O5 / mu. r100 To obtain the phosphorus requirement for every 100 kilograms of target rice yield, P S E represents the amount of phosphorus supplied per unit area of ​​soil. P For phosphorus utilization efficiency, K ar Potassium application rate per unit area, expressed in kg K2O / mu. r100 To determine the potassium requirement for achieving the target rice yield of 100 kilograms, K S E represents the amount of potassium supplied per unit area of ​​soil. K For potassium utilization efficiency, β Kst denoted as the straw return-to-field correction coefficient, and Y represents the target yield for rice cultivation.

7. The calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation according to claim 6, characterized in that, The method of obtaining the supplementary phosphorus fertilizer amount for planting the target rice in the target planting area based on the phosphorus application rate per unit area, the biogas slurry application rate per unit area, and the biogas slurry data to be applied includes: Based on the phosphorus application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied, the supplementary phosphorus fertilizer amount for planting the target rice in the target planting area is obtained using the eleventh expression and the second constraint. The eleventh expression is as follows: ， In the formula, CS b To supplement the amount of phosphate fertilizer, P ar V is the phosphorus application rate per unit area. BS P is the amount of biogas slurry applied per unit area. BS The phosphorus content in biogas slurry; The second constraint is: When P in the eleventh expression ar ≤V BS ×P BS When the ratio is ×1000, the amount of phosphate fertilizer to be supplemented is 0. Furthermore, the step of obtaining the supplemental potassium fertilizer amount for the entire growth period of the target rice in the target planting area based on the potassium application rate per unit area, the biogas slurry application rate per unit area, the biogas slurry data to be applied, and the fertilization data for rice planting, includes: Based on the potassium application rate per unit area and the biogas slurry application rate per unit area in the target planting area, as well as the biogas slurry data to be applied and the fertilization data for rice cultivation, the supplementary potassium fertilizer amount for the entire growth period of the target rice in the target planting area is obtained using the twelfth expression and the third constraint. The twelfth expression is: ， ， In the formula, KC b K represents the amount of potassium chloride applied as base fertilizer, KCs represents the amount of potassium chloride applied as top dressing, and K represents the amount of potassium chloride applied as top dressing. ar Potassium application rate per unit area, KF b V represents the proportion of nitrogen fertilizer as base fertilizer. BS K is the amount of biogas slurry applied per unit area. BS Potassium content in biogas slurry; The third constraint is: When K in the twelfth expression ar ≤V BS ×K BS When ×1000, the amount of potassium fertilizer supplemented during the complete growth period of the target rice in the target planting area is 0, and when K in the twelfth expression... ar × K Fb ≤ V BS × K BS ×1000≤ K ar At that time, KC b =0, the KCs formula is modified as follows: ， In the formula, KCs' is the amount of potassium chloride applied as top dressing, and K ar V is the amount of potassium applied per unit area. BS K is the amount of biogas slurry applied per unit area. BS This refers to the potassium content in the biogas slurry.

8. A calculation system for compound fertilization of biogas slurry fertilizer in rice cultivation, characterized in that, include: The data acquisition module is used to: acquire soil data of the target planting area, fertilization data of rice planting, biogas slurry data to be applied, and planting data of the target rice to be planted in the target planting area; The module for obtaining soil nitrogen supply per unit area is used to: obtain the soil nitrogen supply per unit area of ​​the target planting area based on soil data of the target planting area; The module for obtaining the amount of pure nitrogen applied per unit area is used to: obtain the amount of pure nitrogen applied per unit area in the target planting area based on the soil nitrogen supply per unit area of ​​the target planting area, the fertilization data of rice planting, and the planting data of the target rice. The module for obtaining the amount of biogas slurry applied per unit area is used to: obtain the amount of biogas slurry applied per unit area of ​​the target planting area based on the amount of pure nitrogen applied per unit area of ​​the target planting area, the fertilization data of rice planting, and the data of biogas slurry to be applied. The module for obtaining the amount of nitrogen fertilizer supplementation is used to: obtain the amount of nitrogen fertilizer supplementation for the entire growth period of the target rice based on the amount of pure nitrogen applied per unit area of ​​the target planting area and the fertilization data of rice planting. The module for obtaining phosphorus / potassium supply per unit area of ​​soil is used to: obtain the phosphorus supply per unit area of ​​soil and the potassium supply per unit area of ​​soil in the target planting area based on soil data of the target planting area; The module for obtaining phosphorus / potassium application per unit area is used to: obtain the phosphorus and potassium application per unit area of ​​the target planting area based on the phosphorus and potassium supply per unit area of ​​the soil in the target planting area, as well as the planting data and fertilization data of the target rice. The module for obtaining the amount of supplemental phosphate fertilizer is used to: obtain the amount of supplemental phosphate fertilizer for planting the target rice in the target planting area based on the amount of phosphate applied per unit area, the amount of biogas slurry applied per unit area, and the data on biogas slurry to be applied in the target planting area. The module for obtaining supplemental potassium fertilizer is used to: obtain the amount of supplemental potassium fertilizer for the entire growth period of the target rice in the target planting area based on the amount of potassium applied per unit area, the amount of biogas slurry applied per unit area, the data on biogas slurry to be applied, and the fertilization data for rice planting in the target planting area.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the calculation method for compound fertilization of biogas slurry fertilizer for rice cultivation as described in any one of claims 1 to 7.

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