A method and system for calculating zinc supply in double-cropping rice field soil in a year

Abstract

The present application relates to a kind of double-season rice field soil zinc supply year's estimation method and system, belong to agricultural soil fertilization prediction field, method includes: obtaining the total zinc content value of the soil of the region to be determined;Obtain the rice planting data of the region to be determined, and calculate the total yield value of double-season rice of the region to be determined;According to the total zinc content value of the soil of the region to be determined, judge the zinc supply stage that the soil of the region to be determined currently is;According to the total zinc content value of the soil of the region to be determined and the total yield value of double-season rice, the soil zinc supply limit period corresponding to current zinc supply stage to zinc supply deficiency stage is calculated.The present application can accurately calculate the soil zinc supply limit period, timely supplement zinc fertilizer for soil before soil zinc deficiency, avoid the problem that crop yield and quality are reduced due to soil severe zinc deficiency, provide reference for fertilization opportunity.

Description

Technical Field

[0001] This invention relates to the field of agricultural soil fertilization prediction, and in particular to a method and system for estimating the year of zinc supply in double-cropping paddy fields. Background Technology

[0002] The zinc content in paddy soil has a significant impact on the zinc content of rice. When the total zinc content in the soil is less than 30 mg / kg, it indicates a zinc deficiency. Under these conditions, both rice yield and quality decrease. Therefore, timely supplementation with zinc fertilizer before the zinc in the paddy soil reaches its limit can prevent the negative impact of zinc deficiency on rice yield and quality. Thus, timely and accurate prediction of the soil zinc supply limit (i.e., the time required for the current zinc content in the soil to reach its limit) is essential.

[0003] Currently, the prediction of the soil zinc supply limit is generally based on the personal experience of growers, which has low accuracy. Incorrect predictions can easily lead to situations where zinc fertilizer is not replenished in time after the soil's zinc levels have been depleted. Furthermore, growers lack effective, rapid, and convenient methods to measure soil zinc content, let alone predict zinc depletion. They only consider disease or nutrient deficiency when crop growth is poor and yields decline. Determining nutrient deficiency has a high threshold, requiring sophisticated instruments for measuring soil zinc, which most growers lack diagnostic capabilities for, let alone prediction. Therefore, under limited conditions, accurately and promptly calculating the soil zinc supply limit through one or a few soil zinc nutrient measurements to avoid situations where zinc fertilizer is not replenished in time after the soil's zinc levels have been depleted, leading to reduced rice yield and quality, is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for calculating the year of zinc supply in double-cropping paddy fields. This method can accurately calculate the limit of zinc supply in the soil, enabling early prediction before zinc deficiency occurs and reminding farmers to supplement the soil with zinc fertilizer, thus avoiding the problem of reduced crop yield and quality due to severe zinc deficiency.

[0005] To achieve the above objectives, the present invention provides the following solution: On the one hand, this invention proposes a method for estimating the year of zinc supply in double-cropping paddy fields, the method comprising: Obtain total zinc data of soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; Obtain rice planting data for the area to be measured, and calculate the total yield of double-cropping rice in the area to be measured; the total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; Based on the total zinc content of the soil in the area to be tested, the current zinc supply stage of the soil in the area to be tested is determined; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc-deficient stage. Based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice, the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc supply deficiency stage are calculated.

[0006] Optionally, obtaining the total zinc data of the soil in the area to be tested specifically includes: The total zinc content of the soil in the test area was determined by HF-HNO3-HClO4 digestion-atomic absorption spectrophotometry after the late rice harvest, and the total zinc content value of the soil in the test area was obtained.

[0007] Optionally, obtaining rice planting data for the area to be measured and calculating the total yield of double-cropping rice in the area to be measured specifically includes: Collect rice planting data for the area to be measured; the rice planting data includes planting area, total rice weight, impurity content, empty rice rate, and moisture content; Based on the rice planting data of the area to be tested, calculate the early rice yield and late rice yield of the area to be tested respectively; The total yield of double-cropping rice in the area to be measured is calculated by summing the yields of early rice and late rice in the area to be measured.

[0008] Optionally, the early rice yield and late rice yield of the area to be measured can be calculated using the following formulas: Yield=(10000 / S)×W×(1-I)×(1-E)×[(1-M) / (1-Mo)]; Where Yield represents yield, S represents planting area, W represents total weight of rice, I represents impurity content, E represents empty rice rate, M represents moisture content, and Mo represents standard dry weight moisture content. The total yield of double-cropping rice in the area to be measured is calculated using the following formula: Yield_t = Yield_e + Yield_l; Where Yield_t represents the total yield of double-cropping rice, Yield_e represents the yield of early rice, and Yield_l represents the yield of late rice.

[0009] Optionally, before the step of determining the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested, the following steps are further included: Historical rice yield data and historical total zinc content data were collected from multiple regions in different years. Based on the historical total zinc content data, the soil total zinc content level is divided into three intervals: extremely rich zinc level interval, rich zinc level interval, and zinc deficient level interval, which correspond to the extremely rich zinc supply stage, the rich zinc supply stage, and the zinc deficient stage, respectively. Based on the historical rice yield data, the soil total zinc consumption rate was calculated for the ranges of extremely rich zinc, rich zinc, and zinc deficient zinc at different yield levels. Based on the historical rice yield data, the historical total zinc content data, and the soil total zinc consumption rate data, calculation formulas are determined for the soil zinc supply limit years corresponding to the extremely abundant zinc supply stage, the abundant zinc supply stage, and the zinc deficiency stage, respectively.

[0010] Alternatively, the soil total zinc consumption rate can be calculated using the following formula: V = dx / dt; Where V represents the soil total zinc consumption rate, dx represents the difference in soil total zinc content from year i to year j, dt represents the year difference from year i to year j, i and j are positive integers, and i < j.

[0011] Optionally, determining the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested specifically includes: When 80≤QZn<300mg / kg, it is determined that the soil in the area to be tested is currently in a stage of extremely rich zinc supply; When 50 ≤ QZn < 80 mg / kg, it is determined that the soil in the area to be tested is currently in a stage of abundant zinc supply. When 30 ≤ QZn < 50 mg / kg, it is determined that the soil in the area to be tested is currently in a zinc-deficient stage. QZn represents the total zinc content of the soil in the area to be tested.

[0012] Optionally, the step of calculating the soil zinc supply limit years from the current zinc supply stage to the zinc supply deficiency stage based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice specifically includes: Substituting the total zinc content and total yield of double-cropping rice in the soil of the area to be tested into the formula for calculating the soil zinc supply limit years, the soil zinc supply limit years corresponding to each zinc supply stage are calculated, including: When the current zinc supply stage is the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the rich zinc supply stage, and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated respectively. When the current zinc supply stage is the zinc supply abundance stage, the soil zinc supply limit years corresponding to the zinc supply extreme abundance stage are set to 0, and the soil zinc supply limit years corresponding to the zinc supply abundance stage and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated respectively. When the current zinc supply stage is a zinc supply deficiency stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage and the soil zinc supply limit years corresponding to the rich zinc supply stage are both set to 0, and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated. The soil zinc supply limit years corresponding to the extremely abundant zinc supply stage, the soil zinc supply limit years corresponding to the abundant zinc supply stage, and the soil zinc supply limit years corresponding to the deficient zinc supply stage are summed to obtain the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc supply deficiency stage in the area to be measured.

[0013] Optionally, the formula for calculating the soil zinc supply limit years specifically includes: The JFF formula was used to calculate the soil zinc supply limit years corresponding to the extremely abundant zinc supply stage: The FF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply abundance stage: The QF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply deficiency stage: Wherein, JFF represents the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, FF represents the soil zinc supply limit years corresponding to the rich zinc supply stage, and QF represents the soil zinc supply limit years corresponding to the zinc deficiency stage; QZn represents the total zinc content of the soil in the area to be tested, in mg / kg; Yield_t represents the total yield of double-cropping rice, in kg / hectare.

[0014] On the other hand, the present invention also proposes a system for estimating the year of zinc supply in soil of double-cropping paddy fields, including: The total zinc content acquisition module is used to acquire total zinc data of the soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; The double-cropping rice yield calculation module is used to acquire rice planting data of the area to be measured and to calculate the total yield of double-cropping rice in the area to be measured; the total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; The soil zinc supply stage determination module is used to determine the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc deficiency stage; The soil zinc supply limit calculation module is used to calculate the soil zinc supply limit years from the current zinc supply stage to the zinc supply deficiency stage based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice.

[0015] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: This invention provides a method and system for estimating the year of zinc supply in double-cropping paddy fields. The method includes: acquiring total zinc data of the soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; acquiring rice planting data of the area to be tested and calculating the total yield value of double-cropping rice in the area to be tested; the total yield value of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; determining the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested; the zinc supply stage includes a zinc-rich stage, a zinc-rich stage, and a zinc-deficient stage; and calculating the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc-deficient stage based on the total zinc content value of the soil in the area to be tested and the total yield value of double-cropping rice. This invention only requires collecting the total zinc content of the soil and the total yield of double-cropping rice. Based on the total zinc content, the current zinc supply stage of the soil in the area to be tested can be determined, namely, a stage of extremely abundant zinc supply, a stage of abundant zinc supply, or a stage of deficient zinc supply. Then, based on the total zinc content of the soil and the total yield of double-cropping rice, the limit of the soil zinc supply from the current zinc supply stage to the zinc deficiency stage can be accurately and reliably calculated. This allows for timely supplementation of zinc fertilizer based on the calculation results, ensuring the yield and quality of rice cultivation in the area to be tested, and avoiding the situation where the soil zinc has been depleted to the limit and zinc fertilizer has not been supplemented in time, resulting in a decrease in rice yield and quality. This provides a reference for the timing of fertilization. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The following drawings are not intentionally drawn to scale to actual size; their focus is on illustrating the main points of the present invention.

[0017] Figure 1 A flowchart illustrating the method for estimating the year of zinc supply in double-cropping paddy fields provided in Embodiment 1 of the present invention; Figure 2 A schematic diagram illustrating the method for estimating the year of zinc supply in double-cropping paddy fields provided in Embodiment 1 of the present invention; Figure 3 This is a structural block diagram of the system for estimating the year of zinc supply in double-cropping paddy fields provided in Embodiment 2 of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] As indicated in this invention and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0020] While this invention makes various references to certain modules in systems according to embodiments of the invention, any number of different modules can be used and run on user terminals and / or servers. The modules are merely illustrative, and different aspects of the systems and methods may use different modules.

[0021] This invention uses flowcharts to illustrate the operations performed by the system according to embodiments of the invention. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously, as needed. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0022] The purpose of this invention is to provide a method and system for estimating the year of zinc supply in double-cropping paddy fields, which can accurately estimate the limit of zinc supply in the soil, thereby enabling timely replenishment of zinc fertilizer to the soil before zinc deficiency occurs, and avoiding the problem of reduced crop yield and quality due to zinc deficiency.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 like Figure 1As shown in the figure, this embodiment provides a method for estimating the year of zinc supply in double-cropping paddy fields. The method specifically includes: Step S1: Obtain total zinc data of the soil in the area to be tested. The total zinc data includes the total zinc content value of the soil in the area to be tested. The total zinc content represents the total content of zinc in all forms, including water-soluble zinc, exchangeable zinc, insoluble zinc, and organic zinc, contained in the soil.

[0025] Step S1 specifically includes the following steps: The total zinc content of the soil in the test area was determined by HF-HNO3-HClO4 digestion-atomic absorption spectrophotometry after the late rice harvest, and the total zinc content value of the soil in the test area was obtained.

[0026] Atomic absorption spectrophotometry, or atomic absorption spectrometry for short, is a method for quantitative elemental analysis that utilizes the absorption characteristics of the ground-state atomic vapor of the analyte to its resonance radiation. This method offers advantages such as high sensitivity, good precision, wide applicability, minimal interference, and rapid and simple operation. The following atomic absorption spectrophotometric method can be used: First, within the instrument's recommended concentration range, prepare at least three reference solutions containing zinc, with the concentration increasing sequentially. Add the corresponding reagents used to prepare the test solution for each zinc element. Simultaneously, prepare a blank control solution using the corresponding reagents. After starting the instrument as instructed, sequentially measure the absorbance of the blank control solution and the reference solutions at each concentration, and record the readings. Plot a standard curve with the average of the three absorbance readings at each concentration as the ordinate and the corresponding concentration as the abscissa. Prepare the test solution according to the specifications for each variety, ensuring the estimated zinc concentration is within the range of the standard curve. Measure the absorbance, take the average of three readings, and find the corresponding concentration from the standard curve. Calculate the zinc content, thus achieving accurate determination of the total zinc content in the soil of the test area. This provides an accurate and reliable total zinc content value, laying the foundation for accurately estimating the soil zinc supply limit years and ensuring the accuracy of the results. This embodiment uses the HF-HNO3-HClO4 digestion-atomic absorption spectrophotometry method, which is existing technology; the specific process will not be described further here.

[0027] Step S2: Obtain rice planting data for the area to be measured, and calculate the total yield of double-cropping rice in the area to be measured; the total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year.

[0028] Step S2 specifically includes the following steps: Step S2.1: Collect rice planting data for the area to be measured; the rice planting data includes planting area, total weight of rice, impurity content, empty rice rate and moisture content.

[0029] In this embodiment, the collection of rice planting data specifically includes the following steps: Step S2.1.1: Measure the planting area of ​​the area to be measured; Step S2.1.2: Weigh the early rice and late rice harvested in the same year under the planted area to obtain the total weight of early rice and the total weight of late rice. Step S2.1.3: Randomly select 1 / 10 of the rice from the early rice and late rice, remove impurities, weigh, and determine the impurity content; Step S2.1.4: Randomly select 1 kg of rice from the early rice and late rice after removing impurities for moisture content determination, dry them until the moisture content is less than 20%, remove empty grains, and determine the empty grain rate of early rice and late rice. Step S2.1.5: Use a grain moisture meter to measure the moisture content of early rice and late rice respectively, repeat 10 times and take the average moisture content.

[0030] Step S2.2: Calculate the early rice yield and late rice yield of the area to be measured based on the rice planting data of the area to be measured.

[0031] In this embodiment, the early rice yield and late rice yield of the area to be measured are calculated using the following formulas: Yield=(10000 / S)×W×(1-I)×(1-E)×[(1-M) / (1-Mo)]; Where Yield represents yield; S represents planting area, in m². 2 W represents the total weight of rice in kg; I represents the impurity content; E represents the empty rice rate; M represents the moisture content; Mo represents the standard dry weight moisture content. In this embodiment, the standard dry weight moisture content of indica rice is 13.5%, and the standard dry weight moisture content of japonica rice is 14.5%. Japonica rice is mainly grown in northern regions, while indica rice is mainly grown in southern regions.

[0032] Step S2.3: Sum the early rice yield and late rice yield of the area to be measured to calculate the total yield of double-cropping rice in the area to be measured.

[0033] In this embodiment, the total yield of double-cropping rice in the area to be measured is calculated using the following formula: Yield_t = Yield_e + Yield_l; Where Yield_t represents the total yield of double-cropping rice, Yield_e represents the yield of early rice, and Yield_l represents the yield of late rice.

[0034] Before step S3, the following steps are also included: (1) Collect historical rice yield data and historical total zinc content data from multiple regions in different years.

[0035] (2) Based on the historical total zinc content data, the soil total zinc content level is divided into three intervals: extremely rich zinc level interval, rich zinc level interval, and zinc deficient level interval, which correspond to the extremely rich zinc supply stage, the rich zinc supply stage, and the zinc deficient stage, respectively.

[0036] (3) Based on the historical rice yield data, calculate the soil total zinc consumption rate corresponding to the zinc-rich, zinc-rich and zinc-deficient ranges at different yield levels.

[0037] In this embodiment, the soil total zinc consumption rate is calculated using the following formula: V = dx / dt; Where V represents the soil total zinc consumption rate, dx represents the difference in soil total zinc content from year i to year j, dt represents the year difference from year i to year j, i and j are positive integers, and i < j.

[0038] Furthermore, by transforming the formula for calculating the total zinc consumption rate in soil, we obtain dt=dx / V, where the dividend is the total zinc consumption rate in soil. In practical applications, the annual difference between years i and j can be calculated based on the difference in total zinc content in soil from year i to year j and the total zinc consumption rate in soil. Using this principle, the limit of zinc supply can be estimated in practical applications, thus determining the specific year in which zinc is completely depleted.

[0039] In this embodiment, when dividing the zinc supply into extremely abundant, abundant, and deficient stages, a curve was plotted using extensive historical rice yield and total zinc content data, with time (year) on the x-axis and soil total zinc content on the y-axis. Based on the different slopes of the curves, three zinc supply stage intervals were defined: extremely abundant, abundant, and deficient. The soil total zinc consumption rate was calculated based on the difference between the upper and lower limits of soil total zinc content for each interval, as well as the year difference within that interval.

[0040] (4) Based on the historical rice yield data, the historical total zinc content data and the soil total zinc consumption rate data, determine the calculation formulas for the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, the rich zinc supply stage and the zinc shortage stage, respectively.

[0041] The calculation formula for the soil zinc supply limit years corresponding to different zinc supply stages in this invention specifically includes: The JFF formula was used to calculate the soil zinc supply limit years corresponding to the extremely abundant zinc supply stage: The FF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply abundance stage: The QF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply deficiency stage: Wherein, JFF represents the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, FF represents the soil zinc supply limit years corresponding to the rich zinc supply stage, and QF represents the soil zinc supply limit years corresponding to the zinc deficiency stage; QZn represents the total zinc content of the soil in the area to be tested, in mg / kg; Yield_t represents the total yield of double-cropping rice, in kg / hectare.

[0042] Step S3: Based on the total zinc content of the soil in the area to be tested, determine the current zinc supply stage of the soil in the area to be tested; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc deficiency stage.

[0043] This invention determines the current zinc supply stage of the soil in the area to be tested, specifically as follows: When 80 ≤ QZn < 300 mg / kg, the soil in the area to be tested is determined to be in a stage of extremely rich zinc supply.

[0044] When 50 ≤ QZn < 80 mg / kg, the soil in the area to be tested is determined to be in a stage of abundant zinc supply.

[0045] When 30 ≤ QZn < 50 mg / kg, the soil in the area to be tested is determined to be in a zinc-deficient stage. Here, QZn represents the total zinc content of the soil in the area to be tested.

[0046] It should be noted that the zinc deficiency stage in this embodiment refers to a situation where the total zinc content is slightly lower than normal. Crops will still grow normally, but their growth may be slightly poor (at this time, zinc fertilizer can be supplemented appropriately). Once the total zinc content in the soil falls below the zinc deficiency stage, i.e., QZn < 30 mg / kg, the total zinc content is unfavorable for crop growth. The zinc element in the soil is basically depleted and extremely scarce. At this time, zinc fertilizer must be supplemented immediately; otherwise, crops such as rice will experience a significant reduction in yield and quality, and may even grow slowly or die. Generally, QZn < 30 mg / kg or QZn ≥ 300 mg / kg represent states of extreme zinc deficiency and zinc abundance, respectively, both of which are unfavorable for crop growth and will affect crop yield and quality.

[0047] Step S4: Based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice, calculate the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc supply deficiency stage.

[0048] Step S4 specifically includes the following steps: Step S4.1: Substitute the total zinc content and total yield of double-cropping rice in the soil of the area to be tested into the formula for calculating the soil zinc supply limit years, and calculate the soil zinc supply limit years corresponding to each zinc supply stage, such as... Figure 2 As shown, there are three possible scenarios: 1) When the current zinc supply stage is the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the rich zinc supply stage, and the soil zinc supply limit years corresponding to the zinc deficiency stage are calculated respectively.

[0049] Since the soil in the tested area is considered to be in a zinc-rich stage when 80 ≤ QZn < 300 mg / kg, a zinc-rich stage when 50 ≤ QZn < 80 mg / kg, and a zinc-deficient stage when 30 ≤ QZn < 50 mg / kg, it is necessary to calculate the soil zinc supply limit years JFF, FF, and QF corresponding to the zinc supply limit years for the zinc-rich, zinc-rich, and zinc-deficient stages, respectively.

[0050] 2) When the current zinc supply stage is the zinc supply abundance stage, the soil zinc supply limit years corresponding to the zinc supply extreme abundance stage are set to 0, and the soil zinc supply limit years corresponding to the zinc supply abundance stage and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated respectively.

[0051] If QZn < 80 mg / kg, then JFF = 0, indicating that the current total zinc content is below the stage of extremely abundant zinc supply. Therefore, the soil zinc supply limit year JFF corresponding to the extremely abundant zinc supply stage is taken as 0. At this time, if it is in the stage of abundant zinc supply, it is necessary to calculate the soil zinc supply limit year FF corresponding to the stage of abundant zinc supply and the soil zinc supply limit year QF corresponding to the stage of zinc deficiency.

[0052] 3) When the current zinc supply stage is a zinc supply deficiency stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage and the soil zinc supply limit years corresponding to the rich zinc supply stage are both set to 0, and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated.

[0053] If QZn < 50 mg / kg, then JFF = 0, FF = 0, indicating that the current total zinc content is below the zinc-rich stage. Therefore, the soil zinc supply limit years JFF corresponding to the extremely rich zinc supply stage and the soil zinc supply limit years FF corresponding to the rich zinc supply stage are both taken as 0. If the soil is in a zinc-deficient stage, then only the soil zinc supply limit years QF corresponding to the zinc-deficient stage need to be calculated.

[0054] Step S4.2: Summate the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the rich zinc supply stage, and the soil zinc supply limit years corresponding to the zinc deficiency stage to obtain the soil zinc supply limit years corresponding to the zinc supply stage from the current zinc supply stage to the zinc deficiency stage in the area to be measured.

[0055] This embodiment uses double-cropping rice yield and soil total zinc content as a basis, with the total zinc content ranging from 30-300 mg / kg (the typical zinc content range for paddy fields). It calculates the soil zinc supply limit years, where JFF represents the supply limit years corresponding to the extremely abundant zinc supply stage, FF represents the supply limit years corresponding to the abundant zinc supply stage, and QF represents the supply limit years corresponding to the zinc deficiency stage. Furthermore, since zinc consumption over time undergoes a process from extremely abundant to abundant and then to deficient, the final soil zinc supply limit years are actually the cumulative value GJY of the supply limit years for each of the above zinc supply stages, expressed as GJY = JFF + FF + QF. Figure 2 As shown.

[0056] To provide a more detailed explanation of the process for estimating the soil zinc supply limit in this invention, the following example is provided: Example 1: Suppose that the rice yield in a certain area is 9251 kg / ha and the current total zinc content in the soil is 159 mg / kg. Since 80 ≤ 159 < 300 mg / kg, the total zinc content is determined to be in the extremely rich range, that is, in the stage of extremely rich zinc supply.

[0057] First, there is a consumption time (JFF) for the total zinc content in the soil to decrease from the extremely rich range to the rich range, which can be calculated. Second, after the total zinc content enters the rich range, there is another consumption time (FF) before it decreases to the deficient range, which can also be calculated. When the total zinc content decreases to the deficient range but does not reach the state of extreme deficiency requiring immediate replenishment, this process takes time (QF). Therefore, there are three stages and three time periods. The total number of years of soil zinc supply limit is the sum of these three time periods, calculated as follows: (1) JFF=(QZn1-80) / 7.0=(159-80) / 7.0=11.3 (2) FF=(QZn2-50) / 1.9=(80-50) / 1.9=15.8 (3) QF=(QZn3-30) / 3.2=(50-30) / 3.2=6.3 (4)GJY=JFF+FF+QF=11.3+15.8+6.3=33.4 According to the method of the present invention, the limit of soil zinc supply can be calculated to be 33.4 years. That is to say, under the current planting system and conventional management, the soil will be extremely scarce in about 33.4 years and zinc fertilizer will need to be supplemented immediately, otherwise the yield and quality of crops will be severely reduced.

[0058] Example 2: Assume the rice yield in a certain area is 11200 kg / ha, and the current total zinc content in the soil is 48 mg / kg. Since 30 ≤ 48 < 50 mg / kg, the total zinc content is determined to be within the deficiency range, i.e., the area is in a zinc supply deficiency stage. The calculation process is as follows: (1) Since 48 < 80 mg / kg, therefore, JFF = 0 (2) Since 48 < 50 mg / kg, therefore, FF = 0 (3) QF=(QZn3-30) / 2.3=(48-30) / 2.3=7.8 (4)GJY=JFF+FF+QF=0+0+7.8=7.8 According to the method of the present invention, the limit of soil zinc supply can be calculated to be 7.8 years. That is to say, under the current planting system and routine management, the soil will be depleted and extremely scarce in about 7.8 years, and zinc fertilizer will need to be replenished immediately, otherwise the yield and quality of crops will be severely reduced.

[0059] This invention can accurately predict the time required for zinc deficiency in double-cropping rice and assess the stage of total zinc content in the soil. It provides fertilization guidance for farmers who haven't applied zinc fertilizer for a long time and a basis for the amount of zinc fertilizer applied to paddy fields, ensuring crop yield and quality. Furthermore, some compound fertilizers indiscriminately add large amounts of zinc, leading farmers to apply these fertilizers without knowing their soil composition, resulting in excessive zinc in the soil and toxicity to rice. To avoid soil zinc pollution, if farmers know the current zinc content of their soil, they can determine whether zinc fertilizer is needed and when to apply it. Therefore, this invention also provides farmers with a basis and guidance for purchasing and using zinc-containing compound fertilizers.

[0060] Example 2 Compared to the method for estimating the year of zinc supply in double-cropping paddy soil in Example 1, this example proposes a system for estimating the year of zinc supply in double-cropping paddy soil, such as... Figure 3 As shown, the system specifically includes: The total zinc content acquisition module M1 is used to acquire total zinc data of the soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; The double-cropping rice yield calculation module M2 is used to acquire rice planting data of the area to be measured and calculate the total yield of double-cropping rice in the area to be measured; the total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; The soil zinc supply stage determination module M3 is used to determine the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc deficiency stage; The soil zinc supply limit calculation module M4 is used to calculate the soil zinc supply limit years from the current zinc supply stage to the zinc supply deficiency stage based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice.

[0061] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as being interpreted in an idealized or highly formalized sense, unless expressly defined herein.

[0062] The foregoing description is illustrative of the invention and should not be construed as limiting it. Although several exemplary embodiments of the invention have been described, those skilled in the art will readily understand that many modifications can be made to the exemplary embodiments without departing from the novel teachings and advantages of the invention. Therefore, all such modifications are intended to be included within the scope of the invention as defined in the claims. It should be understood that the foregoing description is illustrative of the invention and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.

Claims

1. A method for estimating the year of zinc supply in double-cropping paddy fields, characterized in that, The method includes: Obtain total zinc data of soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; Obtain rice planting data for the area to be measured, and calculate the total yield of double-cropping rice in the area to be measured; the total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; Based on the total zinc content of the soil in the area to be tested, the current zinc supply stage of the soil in the area to be tested is determined; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc-deficient stage; Based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice, the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc supply deficiency stage are calculated.

2. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 1, characterized in that, The acquisition of total zinc data from the soil in the area to be tested specifically includes: The total zinc content of the soil in the test area was determined by HF-HNO3-HClO4 digestion-atomic absorption spectrophotometry after the late rice harvest, and the total zinc content value of the soil in the test area was obtained.

3. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 1, characterized in that, The process of obtaining rice planting data for the area to be measured and calculating the total yield of double-cropping rice in the area to be measured specifically includes: Collect rice planting data for the area to be measured; the rice planting data includes planting area, total rice weight, impurity content, empty rice rate, and moisture content; Based on the rice planting data of the area to be tested, calculate the early rice yield and late rice yield of the area to be tested respectively. The total yield of double-cropping rice in the area to be measured is calculated by summing the yields of early rice and late rice in the area to be measured.

4. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 3, characterized in that, The early rice yield and late rice yield of the area to be measured are calculated using the following formulas: Yield=(10000 / S)×W×(1-I)×(1-E)×[(1-M) / (1-Mo)]; Where Yield represents yield, S represents planting area, W represents total weight of rice, I represents impurity content, E represents empty rice rate, M represents moisture content, and Mo represents standard dry weight moisture content. The total yield of double-cropping rice in the area to be measured is calculated using the following formula: Yield_t = Yield_e + Yield_l; Where Yield_t represents the total yield of double-cropping rice, Yield_e represents the yield of early rice, and Yield_l represents the yield of late rice.

5. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 1, characterized in that, Before the step of determining the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested, the following steps are also included: Historical rice yield data and historical total zinc content data were collected from multiple regions in different years. Based on the historical total zinc content data, the soil total zinc content level is divided into three intervals: extremely rich zinc level interval, rich zinc level interval, and zinc deficient level interval, which correspond to the extremely rich zinc supply stage, the rich zinc supply stage, and the zinc deficient stage, respectively. Based on the historical rice yield data, the soil total zinc consumption rate was calculated for the ranges of extremely rich zinc, rich zinc, and zinc deficient zinc at different yield levels. Based on the historical rice yield data, the historical total zinc content data, and the soil total zinc consumption rate data, calculation formulas are determined for the soil zinc supply limit years corresponding to the extremely abundant zinc supply stage, the abundant zinc supply stage, and the zinc deficiency stage, respectively.

6. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 5, characterized in that, The soil total zinc consumption rate was calculated using the following formula: V = dx / dt; Where V represents the soil total zinc consumption rate, dx represents the difference in soil total zinc content from year i to year j, dt represents the year difference from year i to year j, i and j are positive integers, and i < j.

7. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 1, characterized in that, The step of determining the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested specifically includes: When 80≤QZn<300mg / kg, it is determined that the soil in the area to be tested is currently in a stage of extremely rich zinc supply; When 50 ≤ QZn < 80 mg / kg, it is determined that the soil in the area to be tested is currently in a stage of abundant zinc supply; When 30 ≤ QZn < 50 mg / kg, it is determined that the soil in the area to be tested is currently in a zinc-deficient stage. QZn represents the total zinc content of the soil in the area to be tested.

8. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 7, characterized in that, The calculation of the soil zinc supply limit years from the current zinc supply stage to the zinc supply deficiency stage, based on the total zinc content and total yield of double-cropping rice in the area to be tested, specifically includes: Substituting the total zinc content and total yield of double-cropping rice in the soil of the area to be tested into the formula for calculating the soil zinc supply limit years, the soil zinc supply limit years corresponding to each zinc supply stage are calculated respectively. Specifically, when calculating the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, QZn in the calculation formula is the total zinc content of the soil in the area to be tested; when calculating the soil zinc supply limit years corresponding to the rich zinc supply stage, QZn in the calculation formula is 80 mg / kg; when calculating the soil zinc supply limit years corresponding to the zinc deficiency stage, QZn in the calculation formula is 50 mg / kg, including: When the current zinc supply stage is the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, the soil zinc supply limit years corresponding to the rich zinc supply stage, and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated respectively. When the current zinc supply stage is the zinc supply abundance stage, the soil zinc supply limit years corresponding to the zinc supply extreme abundance stage are set to 0, and the soil zinc supply limit years corresponding to the zinc supply abundance stage and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated respectively. When the current zinc supply stage is a zinc supply deficiency stage, the soil zinc supply limit years corresponding to the extremely rich zinc supply stage and the soil zinc supply limit years corresponding to the rich zinc supply stage are both set to 0, and the soil zinc supply limit years corresponding to the zinc supply deficiency stage are calculated. The soil zinc supply limit years corresponding to the extremely abundant zinc supply stage, the soil zinc supply limit years corresponding to the abundant zinc supply stage, and the soil zinc supply limit years corresponding to the deficient zinc supply stage are summed to obtain the soil zinc supply limit years corresponding to the transition from the current zinc supply stage to the zinc supply deficiency stage in the area to be measured.

9. The method for estimating the year of zinc supply in double-cropping paddy fields according to claim 8, characterized in that, The formula for calculating the soil zinc supply limit years specifically includes: The JFF formula was used to calculate the soil zinc supply limit years corresponding to the extremely abundant zinc supply stage: The FF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply abundance stage: The QF formula was used to calculate the soil zinc supply limit years corresponding to the zinc supply deficiency stage: Wherein, JFF represents the soil zinc supply limit years corresponding to the extremely rich zinc supply stage, FF represents the soil zinc supply limit years corresponding to the rich zinc supply stage, and QF represents the soil zinc supply limit years corresponding to the zinc deficiency stage; QZn represents the total zinc content of the soil in the area to be tested, in mg / kg; Yield_t represents the total yield of double-cropping rice, in kg / hectare.

10. A system for estimating the year of zinc supply in double-cropping paddy fields, characterized in that, include: The total zinc content acquisition module is used to acquire total zinc data of the soil in the area to be tested; the total zinc data includes the total zinc content value of the soil in the area to be tested; The double-cropping rice yield calculation module is used to acquire rice planting data of the area to be measured and to calculate the total yield of double-cropping rice in the area to be measured. The total yield of double-cropping rice is the sum of the yields of early rice and late rice planted in the same year; The soil zinc supply stage determination module is used to determine the current zinc supply stage of the soil in the area to be tested based on the total zinc content value of the soil in the area to be tested; the zinc supply stage includes an extremely rich zinc supply stage, a rich zinc supply stage, and a zinc deficiency stage; The soil zinc supply limit calculation module is used to calculate the soil zinc supply limit years from the current zinc supply stage to the zinc supply deficiency stage based on the total zinc content of the soil in the area to be tested and the total yield of double-cropping rice.

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