Amino acid water-soluble fertilizer time sequence fertilization method for improving quality of facility peach

Abstract

The application relates to the technical field of water and fertilizer management of facility fruit trees, and discloses an amino acid water-soluble fertilizer time sequence fertilization method for improving the quality of facility peaches, which determines the application concentration and cumulative fertilization frequency of drip irrigation fertilizer liquid according to different varieties of facility peach trees; amino acid raw powder is mixed with irrigation water to prepare amino acid water-soluble fertilizer with a corresponding concentration; the 30th day after the flowering of the facility peach is taken as the first fertilization time, and a fixed interval of 10 days is taken, and the drip irrigation fertilizer liquid is applied to the root zone of the peach through a drip irrigation system. The application concentration of Zhongyoupan No. 13 is set as 1.0 g / L, and the fertilization is performed 3 or 4 times; the application concentration of Zhongyoupan No. 9 is set as 4.0 g / L, and the fertilization is performed 3 times. The method matches the fertilization parameters with the physiological development characteristics of different varieties of fruits, and can effectively improve the single fruit weight, horizontal and vertical diameters and part of the chemical quality indexes of the fruits.

Description

Technical Field

[0001] This invention relates to the field of water and fertilizer management technology for greenhouse fruit trees, specifically a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches. Background Technology

[0002] Greenhouse peach cultivation, through the regulation of environmental conditions such as temperature, humidity, and light, can enable peach trees to flower, set fruit, and ripen earlier. It has become an important cultivation method for year-round peach supply and improving planting efficiency. In a greenhouse environment, the root growth space, water migration process, and nutrient supply conditions of peach trees differ from those of open-field cultivation. Fertilization management during the fruit development stage directly affects fruit enlargement, dry matter accumulation, and flavor quality formation.

[0003] Amino acid water-soluble fertilizers have the characteristics of good water solubility and easy application with water. They can be delivered to the root zone of peach trees through drip irrigation. They are currently used as supplementary fertilizers during the growth period of fruit trees. However, existing fertilization management usually focuses on the type and total amount of fertilizer applied, and lacks clear and interrelated restrictions on the time of the first fertilization, the interval between adjacent fertilizations, and the cumulative number of fertilizations. In actual production, the fertilization date and number of fertilizations are determined based on planting experience, which can easily lead to inconsistencies in the timing of fertilization between different batches, thus affecting the stability and repeatability of fertilization effects.

[0004] During the fruit development process of greenhouse peaches after flowering, the demand for water and nutrients changes at different stages. If fertilization is done too early, the nutrients applied may not match the needs of the fruit enlargement stage. If fertilization is done too late or the cumulative number of fertilizations is too many, it may not necessarily continue to increase the fruit weight and size. In addition, different peach varieties have different fruit development processes, fruit size, and sugar and acid accumulation characteristics. Using the same concentration of amino acid water-soluble fertilizer and the number of fertilizations may have different effects on different varieties. Therefore, simply increasing the fertilizer concentration or the number of fertilizations is not enough to stably improve the quality of greenhouse peaches.

[0005] Existing technologies lack a fertilization method that allows for corresponding settings for greenhouse peach varieties, amino acid water-soluble fertilizer concentrations, the timing of the first post-flowering fertilization, fixed fertilization intervals, and cumulative fertilization frequency. This makes it difficult to match fertilization parameters with the fruit development process of different varieties. Therefore, it is necessary to provide a sequential fertilization method for amino acid water-soluble fertilizer with clear operation time, fixed fertilization parameters, and applicability to different greenhouse peach varieties. This would improve the consistency of fertilization operations and enhance the fruit weight, fruit size, and related quality indicators of greenhouse peaches. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches. This method solves the problem that existing methods for fertilizing greenhouse peaches lack specific limits on the application concentration, start time, fertilization interval, and cumulative number of applications of amino acid water-soluble fertilizer that are not matched with the peach variety, resulting in unstable improvement effects on fruit weight, fruit size, and quality indicators.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches, employing the following technical solution: Amino acid raw powder with a free amino acid content ≥30% is mixed with irrigation water and formulated into the amino acid water-soluble fertilizer according to the determined application concentration. According to the different varieties of peach trees in the facility, the application concentration and cumulative number of fertilizations of amino acid water-soluble fertilizer are determined respectively, wherein the application concentration is 1.0g / L or 4.0g / L, and the cumulative number of fertilizations is 3 or 4 times; The first fertilization is initiated on the 30th day after the peach trees in the facility bloom, with a fixed interval of 10 days between two consecutive drip irrigation fertilizations. The amino acid water-soluble fertilizer is applied to the root zone of the peach trees in the facility through the drip irrigation system according to the determined cumulative number of fertilizations.

[0008] By adopting the above technical solution, and by using a coupling method that combines fertilization parameters based on strong differences in the variety library, and fixed timing after flowering with drip irrigation of high free amino acid pollen, the effect of steadily increasing the single fruit weight and soluble solids content of specific varieties of greenhouse peaches can be achieved.

[0009] The specific physiological response mechanism and innovative principle are as follows: Step 1: Matching the timing of rhizosphere nutrient input. The 30th day after flowering in greenhouse peach trees marks a physiological inflection point where fruit cells rapidly expand and dry matter accumulates. At this time, the root system's demand for organic nitrogen and carbon sources increases dramatically. Using this point as the first fertilization day ensures that the supply curve of exogenous amino acids coincides with the fruit growth and consumption curve. A fixed 10-day fertilization interval aligns with the physiological cycle of root absorption, assimilation, and upward transport of large doses of amino acids, avoiding rhizosphere osmotic pressure stress caused by continuous fertilization.

[0010] Step 2: Free amino acid assimilation metabolism. The free amino acids in the amino acid powder have small molecular weights. After seeping into the dense root zone with irrigation water, they directly enter the cells through amino acid transport proteins in the root epidermal cells.

[0011] Step 3: Variety-Specific Concentration Matching Mechanism. Different greenhouse peach varieties exhibit physiological and genetic differences in fruit sink strength. High concentrations of exogenous amino acids can have a feedback inhibitory effect on varieties with low sink strength, inducing excessive vegetative organ growth; while low-concentration fertilization cannot meet the nutrient amplification needs of varieties with high sink strength. By establishing specific matching rules between varieties and fertilization concentrations and frequencies, the total amount of input nutrients can be balanced with the maximum carrying capacity of the target variety's fruit cells, eliminating quality differences caused by indiscriminate cross-variety fertilization.

[0012] Preferably, the application concentration and cumulative number of fertilizations are set according to any of the following schemes: When the peach trees in the facility are Zhongyoupan No. 13 peach trees, the application concentration is 1.0g / L, and drip irrigation fertilization is carried out once on the 30th day after flowering, the 40th day after flowering and the 50th day after flowering, for a total of 3 fertilizations; Alternatively, apply fertilizer via drip irrigation on the 30th, 40th, 50th, and 60th day after flowering, for a total of four applications. When the peach trees in the facility are Zhongyoupan No. 9 peach trees, the application concentration is 4.0 g / L, and drip irrigation fertilization is carried out once on the 30th day after flowering, the 40th day after flowering, and the 50th day after flowering, for a total of 3 fertilizations.

[0013] By adopting the above technical solution, a low-concentration, high-frequency supply strategy is set for Zhongyoupan 13, while a high-concentration, high-frequency supply strategy is set for Zhongyoupan 9. This ensures that the fertilization intensity matches the characteristics of Zhongyoupan 13, which has a medium fruit size and is sensitive to organic nitrogen, while also meeting the material needs of Zhongyoupan 9, which has a large fruit size and rapidly accumulates carbohydrates. This maximizes the potential of free amino acids to promote the extension of the transverse and longitudinal diameters of different varieties of fruit and the synthesis of vitamin C.

[0014] Preferably, the application concentration refers to the ratio of the mass of the amino acid raw powder added during the preparation of the amino acid water-soluble fertilizer to the total volume of the prepared amino acid water-soluble fertilizer. The organic matter content of the amino acid raw powder is not less than 40%.

[0015] By adopting the above technical solution, the volume concentration of amino acid water-soluble fertilizer is defined by the absolute mass of the raw powder, avoiding the deviation in actual nutrient input caused by differences in the moisture content of commercial fertilizers, and unifying the field application standard. At the same time, the high proportion of organic matter in the raw powder enters the rhizosphere soil, supplementing the free carbon source needed for the reproduction of rhizosphere microorganisms, promoting the release of auxins and gibberellins and other rhizosphere metabolic secondary products by beneficial bacteria, further activating the vitality of peach tree capillary roots, and enhancing the chelation and absorption capacity of mineral elements.

[0016] Preferably, the volume of the amino acid water-soluble fertilizer applied to a single peach tree in a single drip irrigation is 2.0L. Two drippers are installed in the root zone of each peach tree, with the two drippers respectively positioned on both sides of the trunk and symmetrically arranged around the trunk. The rated flow rate of each dripper is 2.0L / h, and the duration of each drip irrigation fertilization is 0.5h.

[0017] By adopting the above technical solution, a fixed numerical closed loop is formed between the rated flow rate, drip irrigation duration, and total fertilizer application per tree, establishing a standardized physical liquid supply model. Symmetrically arranged drippers form a uniform ellipsoidal root zone moist body on both sides of the tree trunk. The 0.5-hour supply time and 2.0L supply volume allow the substrate water containing amino acids to be precisely transported to the soil depth where the main absorbing roots of the peach tree are distributed under the combined action of gravity and soil capillary force, cutting off the path of fertilizer leakage to non-absorption areas and improving the spatial utilization rate of water and free amino acids.

[0018] Preferably, the method further includes applying sulfur-based fully water-soluble compound fertilizer to the peach trees in the facility, wherein the mass ratio of nitrogen, phosphorus pentoxide and potassium oxide in the sulfur-based fully water-soluble compound fertilizer is 12:8:30.

[0019] By adopting the above technical solution, an inorganic basic nutrient system with a high potassium ratio is introduced. Free amino acids, acting as natural chelating agents in plants, can coordinate and complex with potassium and phosphate ions in compound fertilizers, enhancing the transmembrane transport efficiency of inorganic ions. Adequate potassium intake accelerates the unloading of soluble sugars synthesized through photosynthesis to the fruit phloem, creating a synergistic effect with the carbon and nitrogen skeleton provided by amino acids, jointly driving the degradation of titratable acid and the accumulation of total soluble sugar content in greenhouse peaches.

[0020] Preferably, six of the aforementioned greenhouse peach trees are planted in each row, and the total volume of the amino acid water-soluble fertilizer applied to each row of greenhouse peach trees in a single drip irrigation is 12.0L. The greenhouse peach trees are planted in a solar greenhouse, and the soil in which the greenhouse peach trees are cultivated is sandy loam.

[0021] By adopting the above technical solution, the fertilization method is nested with the constant microclimate of the greenhouse and the physical pore structure of sandy loam. The inherent solid particle arrangement characteristics of sandy loam provide suitable water-air equivalent conduction space for amino acid fertilizer solution, maintain the rhizosphere in an aerobic metabolic state, and ensure that root cortex cells continuously produce ATP to maintain the energy consumption of the active transport process of amino acids.

[0022] Preferably, the age of the facility peach trees is 3 years; when the facility peach trees are Zhongyoupan No. 13 peach trees, the spacing between trees is 1.5m × 2.0m; when the facility peach trees are Zhongyoupan No. 9 peach trees, the spacing between trees is 1.5m × 3.0m.

[0023] By adopting the above technical solutions, a population planting spatial structure adapted to the aforementioned fertilizer liquid hydrodynamic parameters and nutrient requirement model of varieties is established, eliminating the negative interference of excessive canopy closure on photosynthetic radiation interception rate, and ensuring that the photosynthetic products produced by the leaves can be efficiently assembled with the amino acids pumped in by the roots in the fruit bank.

[0024] This invention provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches. It has the following beneficial effects: 1. This invention uses the 30th day after the peach blossoms in the facility as the time for the first fertilization and drip irrigation fertilization 3 or 4 times at a fixed interval of 10 days. Therefore, the application process of amino acid water-soluble fertilizer can be limited to the fruit enlargement stage, reducing the management differences caused by the inconsistent fertilization time and improving the repeatability of the fertilization plan.

[0025] 2. This invention determines the application concentration and cumulative number of fertilizations of amino acid water-soluble fertilizer based on Zhongyoupan No. 13 and Zhongyoupan No. 9 respectively. Therefore, the fertilization parameters can be matched with the fruit development characteristics of different varieties, thereby improving the single fruit weight, transverse diameter, longitudinal diameter and some chemical quality indicators.

[0026] 3. This invention adopts a drip irrigation method in which the dripper flow rate, drip irrigation time and fertilizer solution volume per tree correspond to each other, and keeps the concentration and amount of fertilizer consistent for each application of the same treatment. Therefore, the fertilizer solution can be applied to the root zone of peach trees according to the set amount, reducing the impact of the fluctuation of fertilizer amount in each application on the experimental and production results. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0028] I. Experimental materials, cultivation conditions and drip irrigation equipment The greenhouse peach varieties used in the following examples and comparative examples are Zhongyoupan 13 and Zhongyoupan 9, both with a tree age of 3 years. The spacing between plants for Zhongyoupan 13 is 1.5m × 2.0m, and the spacing for Zhongyoupan 9 is 1.5m × 3.0m, with 6 peach trees planted in each row.

[0029] The facility type was a solar greenhouse, and the cultivation soil was sandy loam. Before the experiment began, the soil pH was 6.2 and the electrical conductivity was 0.84 mS / cm.

[0030] The amino acid water-soluble fertilizer used in the following examples and comparative examples is a mixture of commercially available amino acid raw powder (e.g., amino acid raw powder produced by Shandong Lvlong Biotechnology Co., Ltd., enterprise standard: Q / 370782LL016-2022) and irrigation water. This amino acid raw powder is a concentrated animal-type amino acid extract, appearing as a pale yellow powder with a pH of 3-6; its total free amino acid content is not less than 30%, containing 18 kinds of free amino acids; and the raw powder contains 10%-20% chloride ions.

[0031] In addition to amino acid water-soluble fertilizer, sulfur-based fully water-soluble compound fertilizer should be applied in conjunction with the fertilizer application process. The mass ratio of nitrogen, phosphorus pentoxide and potassium oxide in the sulfur-based fully water-soluble compound fertilizer is 12:8:30.

[0032] The amino acid water-soluble fertilizer application concentration mentioned below refers to the ratio of the mass of amino acid raw powder added during the preparation of the amino acid water-soluble fertilizer to the total volume of the prepared amino acid water-soluble fertilizer. The application concentrations of the amino acid water-soluble fertilizer used in each treatment were 1.0 g / L, 4.0 g / L, or 7.0 g / L, respectively.

[0033] The experiment used drip irrigation tape for fertilization. Two drippers were installed per peach tree, positioned on either side of the root zone. Each dripper had a rated flow rate of 2.0 L / h, and each fertilization session lasted 0.5 hours. Therefore, the volume of amino acid water-soluble fertilizer applied per peach tree per application was 2.0 L; with 6 peach trees per row, the total volume of amino acid water-soluble fertilizer applied per row per application was 12.0 L.

[0034] Unless otherwise specified, all embodiments and comparative examples use the same facility cultivation management measures, basic fertilization measures and irrigation conditions. The main difference lies in the application concentration of amino acid water-soluble fertilizer and the cumulative number of fertilizations.

[0035] II. Explanation of Test Treatment Numbering To facilitate the description of combinations of different amino acid water-soluble fertilizer application concentrations and cumulative application times, the following examples, comparative examples, and test results use a unified treatment number.

[0036] CK represents the blank control treatment, which means that under the condition of keeping the basic fertilization, irrigation and other cultivation management measures basically the same, the same volume of water (amino acid content 0g / L) was used instead of amino acid water-soluble fertilizer.

[0037] The letter D indicates the application concentration of amino acid water-soluble fertilizer, where: D1 indicates that the application concentration of the amino acid water-soluble fertilizer is 1.0 g / L; D2 indicates that the application concentration of the amino acid water-soluble fertilizer is 4.0 g / L; D3 indicates that the application concentration of the amino acid water-soluble fertilizer is 7.0 g / L.

[0038] The letter T indicates the cumulative number of drip irrigation fertilization applications performed according to a fixed time sequence, where: T1 indicates that drip irrigation fertilization should be carried out once 30 days after flowering; T2 means that drip irrigation fertilization is carried out once 30 days after flowering and once 40 days after flowering, for a total of 2 fertilizations; T3 means that drip irrigation fertilization will be carried out once 30 days after flowering, once 40 days after flowering, and once 50 days after flowering, for a total of 3 fertilizations; T4 indicates that drip irrigation fertilization should be carried out once at 30 days, 40 days, 50 days and 60 days after flowering, for a total of 4 fertilizations.

[0039] When concentration numbers and time sequence numbers are used in combination, they are used to indicate the corresponding experimental treatments. For example, D1T4 indicates that the application concentration of amino acid water-soluble fertilizer is 1.0 g / L, and drip irrigation fertilization is carried out at 30 days, 40 days, 50 days and 60 days after flowering, for a total of 4 applications. D3T4 indicates that the application concentration of the amino acid water-soluble fertilizer is 7.0 g / L, and the fertilizer is applied a total of 4 times according to the T4 time sequence.

[0040] The above processing numbers are only used to simplify the description of the embodiments, comparative examples and test results, and do not constitute an additional limitation on the technical solution of the present invention.

[0041] Example 1: This embodiment provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches, specifically including the following steps: Three-year-old Zhongyoupan No. 13 peach trees were selected as the fertilization targets. The peach trees were planted in a greenhouse in sandy loam soil, with a spacing of 1.5m × 2.0m between trees.

[0042] Drip irrigation tape was laid in the planting rows of peach trees, and one dripper was installed on each side of the root zone of each peach tree, that is, two drippers were installed per tree, and the rated flow rate of each dripper was 2.0L / h.

[0043] The first fertilization was started 30 days after flowering, with a fixed interval of 10 days between two consecutive fertilizations. Drip irrigation fertilization was carried out once each on the 30th, 40th, 50th, and 60th day after flowering, for a total of 4 fertilizations.

[0044] Commercial amino acid raw powder was mixed with irrigation water to prepare an amino acid water-soluble fertilizer with a concentration of 1.0 g / L.

[0045] On each scheduled fertilization day, apply amino acid water-soluble fertilizer to the root zone of the peach trees through drip irrigation. Each drip irrigation fertilization lasts for 0.5 hours, with 2.0L of amino acid water-soluble fertilizer applied to each peach tree in a single application; when planting 6 peach trees per row, apply 12.0L of amino acid water-soluble fertilizer to each row in a single application.

[0046] This embodiment corresponds to D1T4 processing.

[0047] Example 2: This embodiment provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches, specifically including the following steps: Three-year-old Zhongyoupan No. 13 peach trees were selected as the fertilization targets. The peach trees were planted in a greenhouse in sandy loam soil, with a spacing of 1.5m × 2.0m between trees.

[0048] Drip irrigation tape was laid in the planting rows of peach trees, and one dripper was installed on each side of the root zone of each peach tree, that is, two drippers were installed per tree, and the rated flow rate of each dripper was 2.0L / h.

[0049] The first fertilization was started 30 days after flowering, with a fixed interval of 10 days between two consecutive fertilizations. Drip irrigation fertilization was carried out once on the 30th, 40th and 50th day after flowering, for a total of 3 fertilizations.

[0050] Commercial amino acid raw powder is mixed with irrigation water to prepare an amino acid water-soluble fertilizer with a concentration of 1.0 g / L.

[0051] On each scheduled fertilization day, apply amino acid water-soluble fertilizer to the root zone of the peach trees through drip irrigation. Each drip irrigation fertilization lasts for 0.5 hours, with 2.0L of amino acid water-soluble fertilizer applied to each peach tree in a single application; when planting 6 peach trees per row, apply 12.0L of amino acid water-soluble fertilizer to each row in a single application.

[0052] This embodiment corresponds to D1T3 processing.

[0053] Example 3: This embodiment provides a method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches, specifically including the following steps: Three-year-old Zhongyoupan No. 9 peach trees were selected as the fertilization targets. The peach trees were planted in a greenhouse in sandy loam soil, with a spacing of 1.5m × 3.0m between trees.

[0054] Drip irrigation tape was laid in the planting rows of peach trees, and one dripper was installed on each side of the root zone of each peach tree, that is, two drippers were installed per tree, and the rated flow rate of each dripper was 2.0L / h.

[0055] The first fertilization was started 30 days after flowering, with a fixed interval of 10 days between two consecutive fertilizations. Drip irrigation fertilization was carried out once on the 30th, 40th and 50th day after flowering, for a total of 3 fertilizations.

[0056] Commercial amino acid raw powder was mixed with irrigation water to prepare an amino acid water-soluble fertilizer with a concentration of 4.0 g / L.

[0057] On each scheduled fertilization day, apply amino acid water-soluble fertilizer to the root zone of the peach trees through drip irrigation. Each drip irrigation fertilization lasts for 0.5 hours, with 2.0L of amino acid water-soluble fertilizer applied to each peach tree in a single application; when planting 6 peach trees per row, apply 12.0L of amino acid water-soluble fertilizer to each row in a single application.

[0058] This embodiment corresponds to D2T3 processing.

[0059] Comparative Example 1: This comparative example serves as a blank control for the Zhongyoupan 13 peach tree.

[0060] This comparative example uses the same peach tree variety, age, facility conditions, cultivation soil, drip irrigation conditions, basic fertilization measures and other cultivation management measures as Example 1, the difference being that no amino acid water-soluble fertilizer is applied.

[0061] This comparative example corresponds to the CK treatment of Zhongyou Pan 13.

[0062] Comparative Example 2: This comparative example is basically the same as Example 3, except that the cumulative number of applications of the amino acid water-soluble fertilizer is different.

[0063] This comparative study used 30 days after flowering as the starting date for the first fertilization, with a fixed interval of 10 days between adjacent fertilizations. Drip irrigation fertilization was carried out once each at 30, 40, 50, and 60 days after flowering, for a total of 4 fertilizations. The concentration of amino acid water-soluble fertilizer applied each time was 4.0 g / L.

[0064] This comparative example corresponds to the D2T4 treatment of Zhongyou Pan 9.

[0065] Comparative Example 3: This comparative example is basically the same as Example 1, except that the application concentration of the amino acid water-soluble fertilizer is different.

[0066] In this comparative study, drip irrigation fertilization was performed once each at 30, 40, 50, and 60 days after flowering, for a total of four applications. The concentration of the amino acid water-soluble fertilizer applied each time was 7.0 g / L.

[0067] This comparative example corresponds to the D3T4 treatment of Zhongyou Pan 13.

[0068] Comparative Example 4: This comparative example serves as a blank control for the Zhongyoupan No. 9 peach tree.

[0069] This comparative example uses the same peach tree variety, age, facility conditions, cultivation soil, drip irrigation conditions, basic fertilization measures and other cultivation management measures as Example 3, the difference being that no amino acid water-soluble fertilizer is applied.

[0070] This comparative example corresponds to the CK treatment of Zhongyou Pan 9.

[0071] Test Example 1: Samples were taken after the facility-grown peaches in each embodiment and comparative example reached commercial harvest maturity.

[0072] Three peach trees with similar growth were selected from the planting row of each treatment. Fruits that were normally developed and free from obvious diseases and pests were collected from different positions on the outer periphery of the canopy of each peach tree. The collected fruits were used as the test samples for the corresponding treatment.

[0073] The weight of each fruit was measured individually using an electronic balance.

[0074] After removing the pits from the fruit, the pulp was homogenized and the juice was extracted. The soluble solids content of the juice was determined using a handheld refractometer. The total soluble sugar content was determined using conventional detection methods in this field. The content of titratable acids was determined by acid-base titration; the content of vitamin C was determined by 2,6-dichlorophenolindophenol titration.

[0075] The sugar-acid ratio is calculated using the following formula: Sugar-acid ratio = Total soluble sugar content ÷ Titratable acid content.

[0076] All test results are expressed as mean ± standard deviation, and the results are shown in Table 1.

[0077] Table 1. Results of peach fruit weight and chemical quality determination at each treatment facility

[0078] in conclusion: As shown in Table 1, for the Zhongyoupan 13 variety, the single fruit weight, soluble solids content, and vitamin C content of Examples 1 and 2 were all higher than those of Comparative Example 1. Among them, Example 1 had higher single fruit weight, soluble solids content, total soluble sugar content, and sugar-acid ratio; Example 2 had a higher vitamin C content.

[0079] Example 1 and Comparative Example 3 used the same fertilization sequence and cumulative fertilization frequency, the difference being the application concentration of amino acid water-soluble fertilizer, which was 1.0 g / L and 7.0 g / L, respectively. The single fruit weight, soluble solids content, total soluble sugar content, sugar-acid ratio, and vitamin C content of Example 1 were all higher than those of Comparative Example 3, indicating that under the conditions of this experiment, increasing the application concentration of amino acid water-soluble fertilizer did not synchronously improve the above quality indicators of Zhongyoupan 13.

[0080] For Zhongyoupan 9, the single fruit weight in Example 3 was higher than that in Comparative Examples 2 and 4, indicating that under the condition of an amino acid water-soluble fertilizer application concentration of 4.0 g / L, fertilization three times is beneficial to increasing the single fruit weight of Zhongyoupan 9. The soluble solids content, soluble total sugar content, and sugar-acid ratio in Comparative Example 2 were higher than those in Example 3, indicating that the number of fertilizations has an inconsistent effect on different quality indicators of Zhongyoupan 9.

[0081] The above results indicate that there is a certain matching relationship between the application concentration and cumulative application frequency of amino acid water-soluble fertilizer and greenhouse peach varieties. Furthermore, different treatments have different effects on indicators such as fruit weight, sugar accumulation, acidity, and vitamin C. The relevant quality indicators do not increase synchronously with the increase of the application concentration or cumulative application frequency of amino acid water-soluble fertilizer.

[0082] Test Example 2: After the facility-grown peaches in each embodiment and comparative example reached commercial harvest maturity, fruit samples were collected according to the sampling method of Test Example 1.

[0083] The transverse and longitudinal diameters of the fruit were measured using digital vernier calipers. The transverse diameter is the maximum diameter at the equator of the fruit, and the longitudinal diameter is the maximum length from the top of the fruit to the stem.

[0084] All test results are expressed as mean ± standard deviation, and the results are shown in Table 2.

[0085] Table 2. Results of peach fruit morphology measurements at each treatment facility

[0086] in conclusion: As shown in Table 2, for Zhongyoupan 13, the transverse and longitudinal diameters of the fruits in Examples 1 and 2 were both higher than those in Comparative Example 1. The transverse and longitudinal diameters of the fruits in Example 1 were also higher than those in Comparative Example 3, which used 7.0 g / L amino acid water-soluble fertilizer. This indicates that under the same fertilization sequence, increasing the concentration of amino acid water-soluble fertilizer did not further promote the increase in fruit volume of Zhongyoupan 13.

[0087] For Zhongyoupan No. 9, the transverse and longitudinal diameters of the fruit in Example 3 were higher than those in Comparative Examples 2 and 4, indicating that under the condition of an amino acid water-soluble fertilizer application concentration of 4.0 g / L, fertilization three times is more beneficial to increasing the transverse and longitudinal diameters of Zhongyoupan No. 9 fruit than fertilization four times.

[0088] The results of Test Example 1 and Test Example 2 show that under the facility cultivation conditions of this experiment, applying 1.0 g / L amino acid water-soluble fertilizer three or four times can improve fruit weight, fruit size and some chemical quality indicators of Zhongyoupan No. 13; applying 4.0 g / L amino acid water-soluble fertilizer three times can show a more obvious advantage in improving single fruit weight, transverse diameter and longitudinal diameter of Zhongyoupan No. 9.

Claims

1. A method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches, characterized in that, include: Amino acid raw powder with a free amino acid content of ≥30% is mixed with irrigation water and formulated into an amino acid water-soluble fertilizer according to the determined application concentration. According to the different varieties of peach trees in the facility, the application concentration and cumulative number of fertilizations of amino acid water-soluble fertilizer are determined respectively, wherein the application concentration is 1.0g / L or 4.0g / L, and the cumulative number of fertilizations is 3 or 4 times; The first fertilization is initiated on the 30th day after the peach trees in the facility bloom, with a fixed interval of 10 days between two consecutive drip irrigation fertilizations. The amino acid water-soluble fertilizer is applied to the root zone of the peach trees in the facility through the drip irrigation system according to the determined cumulative number of fertilizations.

2. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The application concentration and cumulative number of fertilizations shall be set according to any one of the following schemes: When the peach trees in the facility are Zhongyoupan No. 13 peach trees, the application concentration is 1.0g / L, and drip irrigation fertilization is carried out once on the 30th day after flowering, the 40th day after flowering and the 50th day after flowering, for a total of 3 fertilizations; Alternatively, apply fertilizer via drip irrigation on the 30th, 40th, 50th, and 60th day after flowering, for a total of four applications. When the peach trees in the facility are Zhongyoupan No. 9 peach trees, the application concentration is 4.0 g / L, and drip irrigation fertilization is carried out once on the 30th day after flowering, the 40th day after flowering, and the 50th day after flowering, for a total of 3 fertilizations.

3. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The application concentration refers to the ratio of the mass of the amino acid raw powder added when preparing the amino acid water-soluble fertilizer to the total volume of the prepared amino acid water-soluble fertilizer.

4. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The organic matter content of the amino acid raw powder shall not be less than 40%.

5. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The volume of the amino acid water-soluble fertilizer applied to a single peach tree in the facility during a single drip irrigation is 2.0L.

6. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 5, characterized in that, Two drippers are installed in the root zone of each of the aforementioned facility peach trees. The two drippers are respectively installed on both sides of the trunk of the facility peach tree and symmetrically arranged with the trunk as the center. The rated flow rate of each dripper is 2.0L / h, and the duration of each drip irrigation fertilization is 0.5h.

7. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The method also includes applying sulfur-based fully water-soluble compound fertilizer to the peach trees in the facility, wherein the mass ratio of nitrogen, phosphorus pentoxide and potassium oxide in the sulfur-based fully water-soluble compound fertilizer is 12:8:

30.

8. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 5, characterized in that, Six of the aforementioned facility-grown peach trees are planted in each row, and the total volume of the amino acid water-soluble fertilizer applied to each row of the facility-grown peach trees in a single drip irrigation is 12.0L.

9. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 1, characterized in that, The peach trees in the facility are planted in a solar greenhouse, and the soil in which the peach trees are planted is sandy loam.

10. The method for sequential application of amino acid water-soluble fertilizer to improve the quality of greenhouse peaches according to claim 2, characterized in that, The peach trees in the facility are 3 years old; When the peach trees in the facility are Zhongyoupan No. 13 peach trees, the spacing between trees is 1.5m × 2.0m; When the peach trees in the facility are Zhongyoupan No. 9 peach trees, the spacing between trees is 1.5m × 3.0m.

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