Special corn water and fertilizer integrated fertilizer, preparation method and application

Abstract

The application discloses a corn water-fertilizer integrated special fertilizer, a preparation method and application, and relates to the technical field of fertilizer mixtures. The corn water-fertilizer integrated special fertilizer comprises a jointing period special fertilizer, a big bell mouth period special fertilizer, a tasseling period special fertilizer and a grain filling period special fertilizer. Compared with the prior art, the special fertilizer provides timely and appropriate nutrient supply for the growth cycle of corn, guarantees stable yield and yield increase of corn, effectively alleviates the problem of soil nutrient imbalance, reduces soil degradation and acidification, improves the anti-negative pressure blockage performance in irrigation application, effectively prevents the blockage problem of a drip irrigation system, reduces maintenance cost, and improves the economic benefits and implementation effect of the water-fertilizer integrated technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fertilizer mixtures, in particular to a corn water-fertilizer integrated special fertilizer, a preparation method and application. BACKGROUND

[0002] With the growth of global population and the tension of agricultural resources, improving crop yield and optimizing agricultural management have become an urgent task. The high yield and stable yield of corn play a crucial role in food production safety. In order to pursue high yield, the traditional fertilization method of corn requires high fertilizer input, and the fertilizer utilization rate is very low. Although high water and high fertilizer can obtain higher yield, the utilization efficiency is not high, and at the same time, it can also cause a large amount of accumulation of nitrogen, phosphorus and potassium elements in the soil, change the original physicochemical properties of the soil, and cause damage to the farmland ecological environment. The trace elements related to human health in the soil are absorbed by crops, and people can only supplement the nutrients needed by the body after eating crops. The deterioration of the quality of cultivated soil will lead to insufficient transformation and storage of nutrients in crops after absorption, which will not only affect the growth of crops and the quality of agricultural products, but also affect human health through the food chain if the soil itself contains insufficient nutrients.

[0003] The traditional irrigation and fertilization method of corn can cause nitrogen, phosphorus and potassium to solidify in the soil, cause compaction, lead to soil nutrient loss, deterioration of soil physicochemical properties, and decline of soil fertility. Water-fertilizer integrated technology can effectively alleviate the imbalance of nutrients in the soil, reduce soil degradation and acidification, and improve the soil water and fertilizer retention capacity. At the same time, it can also promote the reproduction of beneficial microorganisms in the soil, improve the biological activity of the soil, and further improve the soil environment. Therefore, in order to improve the traditional irrigation and fertilization method, it is necessary to precisely and scientifically match a variety of nutrient elements that cannot be achieved by traditional cultivation technology, to produce chelation by using advanced technology, to make functional fertilizers targeted for each key growth period of crops, and to comprehensively improve the taste, nutrient content and weight of corn, so as to achieve the purpose of improving planting benefits.

[0004] CN104311203A discloses a corn water and fertilizer integrated special fertilizer and its application method, the water and fertilizer integrated special fertilizer includes emergence special fertilizer, ear special fertilizer, flower and grain special fertilizer; the three special fertilizers all include the following components: urea, diammonium phosphate, potassium chloride, chelated zinc, boric acid, chelated manganese, chelated magnesium, chelated iron, chelated copper. The corn water and fertilizer integrated special fertilizer of the application is developed according to the demand law of corn for nutrients, different fertilizer formulations are used in different growth periods of corn, and the effect is strong; the nitrogen, phosphorus and potassium ratio is reasonable, the demand of corn at different growth and development stages for macronutrients is met, trace elements are added, the effect of balanced fertilization is achieved, the fertilizer utilization efficiency is higher, the corn yield can be obviously improved, and the purpose of yield increase and income increase is achieved; all nutrients are available nutrients, water-soluble, stable, combined with the drip irrigation method, the drip head is not blocked in the drip irrigation process, the advantages of saving fertilizer and water are achieved, and the application is suitable for popularization and application. The application patent only starts from the formula, different special fertilizers are prepared by using different formulations for different growth periods, the nutrient demand of growth and development is met, the purpose of yield increase and income increase is achieved, and the problems of drip head blockage in the water and fertilizer drip irrigation process and soil pollution caused by rich fertilizer nutrients are not solved.

[0005] CN104969705A discloses a corn water and fertilizer integrated fertilization method based on farmland nitrogen balance. In the agricultural production process, in order to improve crop yield, a large amount of fertilizer is input, among which, chemical fertilizer, especially nitrogen fertilizer, plays a dominant role. The nitrogen in the soil cannot be completely utilized by crops, and part of the nitrogen is accumulated in the deep soil and part of the nitrogen is leached out of the root zone with irrigation and precipitation and enters the underground water, which causes serious environmental pollution. Therefore, the application needs to determine the soil nutrient content, plant nutrient content, nitrogen transport contribution rate, and the like, so as to obtain the ecological optimal nitrogen application amount considering environmental factors, and reduce agricultural non-point source pollution from the source by improving the water and fertilizer utilization efficiency of crops. The application patent solves the problem of soil pollution by strictly controlling the fertilization amount and adjusting the fertilizer formula, and does not solve the problems of saving fertilizer and water, yield increase and income increase at the same time. SUMMARY

[0006] In view of the above defects of the prior art, the technical problem to be solved by the application is to provide a corn water and fertilizer integrated special fertilizer including the jointing stage, the big bell mouth stage, the tassel stage and the grain filling stage, and application of the corn water and fertilizer integrated special fertilizer in an irrigation method, so as to solve the problems of acidification and pollution of soil caused by the composite liquid fertilizer, the anti-blocking problem in the application of the water and fertilizer integrated irrigation device, the soil nutrient loss caused by the low utilization rate of the composite liquid fertilizer, and the problem of non-obvious effect of saving fertilizer and water.

[0007] In order to achieve the above-mentioned purpose, the application provides a corn water and fertilizer integrated special fertilizer, a preparation method and application.

[0008] Specifically, the component and amount of the jointing period special fertilizer, the big bell mouth period special fertilizer, the tasseling period special fertilizer and the grain filling period special fertilizer are as follows:

[0009] (1) The jointing period special fertilizer comprises the following components in parts by weight: urea 6-8 parts, superphosphate 4-6 parts, potassium chloride 2-4 parts, zinc sulfate 1-2 parts, boric acid 1-2 parts, and synergist 1-2 parts.

[0010] (2) The big bell mouth period special fertilizer comprises the following components in parts by weight: urea 10-12 parts, diammonium phosphate 8-10 parts, potassium sulfate 1-2 parts, magnesium sulfate 1-2 parts, ferrous sulfate 1-2 parts, and synergist 1-2 parts.

[0011] (3) The tasseling period special fertilizer comprises the following components in parts by weight: urea 4-6 parts, potassium sulfate 4-6 parts, superphosphate 4-6 parts, copper sulfate 1-2 parts, manganese sulfate 1-2 parts, and synergist 1-2 parts.

[0012] (4) The grain filling period special fertilizer comprises the following components in parts by weight: calcium nitrate 6-8 parts, fluorapatite 0.1-1 part, sodium silicate 1-2 parts, and synergist 1-2 parts.

[0013] The synergist is a mixture of any two or more of polyaspartic acid, modified polyaspartic acid, D-sodium gluconate and polyepoxysuccinic acid.

[0014] Preferably, the synergist is a mixture of modified polyaspartic acid, D-sodium gluconate and polyepoxysuccinic acid; preferably, the components in parts by weight are as follows: modified polyaspartic acid 0.4-0.8 parts, D-sodium gluconate 0.3-0.6 parts, and polyepoxysuccinic acid 0.3-0.6 parts.

[0015] The modification method of the modified polyaspartic acid is as follows: polyaspartic acid is dissolved in water, polyglutamic acid is added, stirring is carried out at 100-120 DEG C for 2-4 hours, concentration and drying are carried out at 60-70 DEG C, and grinding and sieving are carried out to obtain modified polyaspartic acid.

[0016] The amount of the polyaspartic acid, water and polyglutamic acid is in a weight ratio of 1.5-2.5:15-25:0.2-0.4.

[0017] The grinding and sieving is carried out through a 40-50 mesh sieve.

[0018] The application further provides a preparation method of the corn water and fertilizer integrated special fertilizer, which is as follows:

[0019] The jointing stage special fertilizer, the big trumpet mouth stage special fertilizer, the tasseling stage special fertilizer and the grain filling stage special fertilizer are respectively dissolved in water to prepare a jointing stage compound liquid fertilizer, a big trumpet mouth stage compound liquid fertilizer, a tasseling stage compound liquid fertilizer and a grain filling stage compound liquid fertilizer by dilution at a ratio of 1:10, and then the compound liquid fertilizers are injected into the water-fertilizer integrated irrigation device to drip irrigation fertilization in the corresponding growth development period.

[0020] The application further provides application of the corn water-fertilizer integrated special fertilizer in irrigation mode, and the method is as follows:

[0021] (1) install the water-fertilizer integrated irrigation device, and correspondingly arrange one thin pipe for each corn, and the pipe opening is located above the corn root;

[0022] (2) connect the buried pipe with the drip irrigation belt after sowing;

[0023] (3) calculate the amount of fertilizer for this time according to the specific area of the farmed crops, and weigh or measure the fertilizer for each round irrigation area, for example as follows:

[0024] The jointing stage compound liquid fertilizer is used in an amount of 4-5 kg / mu, and the water consumption in this stage is 300-400 cubic meters / mu, and irrigation should be avoided during the corn flowering period, and irrigation should be performed before the flowering period;

[0025] When the planting density is 5000-5499 plants / mu, the big trumpet mouth stage compound liquid fertilizer is used in an amount of 8-8.5 kg / mu;

[0026] When the planting density is 5500-5999 plants / mu, the big trumpet mouth stage compound liquid fertilizer is used in an amount of 9-9.5 kg / mu;

[0027] When the planting density is 6000-6499 plants / mu, the big trumpet mouth stage compound liquid fertilizer is used in an amount of 10-10.5 kg / mu;

[0028] When the planting density is 6500-6999 plants / mu, the big trumpet mouth stage compound liquid fertilizer is used in an amount of 11-11.5 kg / mu;

[0029] When the planting density is 7000-7499 plants / mu, the big trumpet mouth stage compound liquid fertilizer is used in an amount of 12-12.5 kg / mu;

[0030] The tasseling stage compound liquid fertilizer is used in an amount of 4-5 kg / mu, and the water consumption in this stage is 400-500 cubic meters / mu;

[0031] The grain filling stage compound liquid fertilizer is used in an amount of 4-5 kg / mu, and the water consumption in this stage is 450-550 cubic meters / mu;

[0032] (4) open the water-fertilizer integrated irrigation device, and slowly drip the compound liquid fertilizer and water to the corn root;

[0033] (5) After irrigation, drain the water in the fertilizer tank, and tightly cover the tank cover.

[0034] The corn water and fertilizer integrated special fertilizer of the application includes jointing period special fertilizer, big trumpet period special fertilizer, tassel period special fertilizer and grain filling period. The jointing period is the key period of corn vegetative growth, and sufficient nitrogen fertilizer is needed to support the growth of stems. Urea as the main nitrogen source can be rapidly absorbed and utilized by plants, promoting the elongation of stems and the expansion of leaves. Combined with the phosphorus and potassium elements provided by superphosphoric acid calcium and potassium chloride, the development of root system is promoted and the disease resistance of plants is enhanced, and the overall growth and development quality is improved. The addition of zinc sulfate and boric acid helps to prevent plant deficiency symptoms, such as small leaf disease caused by zinc deficiency and pollination problems affected by boron deficiency. The use of synergist further improves the utilization rate of fertilizer, ensures that plants can more efficiently absorb and utilize nutrients, reduces nutrient loss, and improves the economic benefit of fertilizer investment.

[0035] The big trumpet period is the transition stage from vegetative growth to reproductive growth of corn, and the demand for phosphorus and potassium increases. The increase of diammonium phosphate and potassium sulfate helps to support the reproductive growth of corn and enhance the formation and development of flower organs. The addition of magnesium sulfate and ferrous sulfate improves the energy metabolism and respiration of plants, further promoting the healthy growth of plants. The use of synergist further enhances the absorption and utilization of nutrients by plants.

[0036] If nutrients are missing during the tassel period of corn, it will affect the differentiation of tassel and pollen formation. Urea as a nitrogen source helps to support the overall growth of plants and the development of tassel. Potassium sulfate provides essential potassium elements, which have a beneficial effect on pollen formation and quality. The phosphorus element supplemented by superphosphoric acid calcium is crucial for the development of plant roots, energy conversion and seed formation. Copper sulfate and manganese sulfate are crucial for key physiological processes such as photosynthesis, enzyme activity, nitrogen metabolism, antioxidant and protein synthesis in plants, which can promote the healthy growth of corn and increase yield. The addition of synergist improves the utilization rate of fertilizer and the absorption efficiency of crops to nutrients, ensuring that nutrients can be more effectively absorbed and utilized by corn, thereby promoting the full development of tassel and the healthy formation of pollen during the tassel period, laying a good foundation for subsequent pollination and seed setting.

[0037] The grouting period is a key stage of corn kernel maturity, at which time the kernel rapidly accumulates starch and other organic matter, requiring a large amount of calcium to strengthen the cell wall, and an appropriate amount of phosphorus to support energy conversion, and the addition of calcium nitrate can enhance the structure of the cell wall, improve the kernel solidity and storage and transportation resistance; phosphorus element is crucial to energy conversion and metabolic process, and is helpful to the synthesis of starch and protein inside the kernel, and fluorapatite can continuously provide phosphorus nutrition as a slow-release phosphorus source, and promote kernel plumpness; sodium silicate can enhance the silicification of plant cell walls, improve the mechanical strength and disease resistance of plants, so that corn can more effectively resist the invasion of pests and diseases, and ensure the healthy development of kernels. Combined with the use of synergists, the nutrient requirements and synergistic effects of the fertilizer formula are comprehensively improved, which is helpful to improve the yield and quality of corn.

[0038] The synergist in the application is composed of polyaspartic acid, modified polyaspartic acid, D-sodium gluconate, polyepoxysuccinic acid, etc., wherein the D-sodium gluconate as a natural chelating agent reduces the precipitation of metal ions in the fertilizer and improves the fertilizer utilization; it can also adjust the pH value of the liquid fertilizer and maintain a suitable acid-base environment; it is helpful to adjust the carbon-nitrogen ratio in the plant body and promote the photosynthesis and growth of the plant. The addition of polyepoxysuccinic acid is mainly to improve the scale inhibition performance of the fertilizer, reduce the scaling problem that may occur in the irrigation system, and ensure the efficient operation of the water-fertilizer integrated system; at the same time, through its dispersion effect, it helps to maintain the uniformity of the composite liquid fertilizer, so that the plant can more uniformly absorb nutrients and improve the utilization efficiency of the fertilizer; as a biodegradable polymer, polyepoxysuccinic acid can gradually decompose in the environment after application, reducing the residue of chemical substances, and being conducive to maintaining the ecological balance and long-term fertility of the soil.

[0039] Polyaspartic acid can form stable chelates with multivalent metal ions such as calcium, magnesium, copper, iron, etc., thereby improving the solubility and bioavailability of these metal ions and enhancing the utilization rate of the fertilizer; at the same time, it also has scale inhibition and dispersion effects, which have a positive significance for preventing scaling problems in the irrigation system, ensuring the smoothness and efficient operation of the irrigation system. Further, the polyaspartic acid is modified in the application, and its chelating ability and biodegradability are enhanced through combination with polyglutamic acid, reducing the potential impact on the environment; the modified polyaspartic acid effectively prevents the formation of calcium carbonate scale by reducing the completeness and order of the crystal; the modified polyaspartic acid improves the scale inhibition and dispersion of the composite liquid fertilizer, solving the scaling problem in the irrigation system.

[0040] Under the technology, by reasonably increasing the corn planting density, the water and fertilizer required for the growth of corn is accurately controlled, the irrigation water and the fertilizer are cooperated, and are delivered to the roots of crops, the amount of irrigation and fertilization can be accurately controlled, the irrigation water and the fertilizer can be efficiently utilized, the water and fertilizer utilization efficiency is improved, the bottleneck of corn yield increase is broken, and meanwhile, water and fertilizer waste and environmental pollution are reduced.

[0041] The beneficial effects of the present application are as follows:

[0042] 1. In practical application, the irrigation water and the fertilizer are cooperated, and are delivered to the roots of crops, the amount of irrigation and fertilization can be accurately controlled, the irrigation water and the fertilizer can be efficiently utilized, the water and fertilizer utilization efficiency is improved, the formula of the special fertilizer is closely combined with the growth cycle of corn, the timely and appropriate supply of nutrients is ensured, the healthy growth of corn is promoted, the stress resistance of corn is enhanced, and the stable yield and yield increase of corn are ensured.

[0043] 2. The problem of nutrient imbalance in the soil is effectively alleviated, the soil degradation and acidification are reduced, the stability of the soil pH value is maintained, the environmental pollution and the growth obstacles of crops caused by soil acidification are reduced, and the best soil environment for the growth of corn is created.

[0044] 3. The anti-negative pressure blocking performance in the application of the special fertilizer irrigation is improved, the clogging problem of the buried drip irrigation pipe is effectively prevented, the maintenance cost is reduced, and the implementation effect and economic benefit of the water and fertilizer integration technology are improved. DETAILED DESCRIPTION

[0045] The parameters of the specific chemical substances used in the examples are as follows:

[0046] Polyglutamic acid: purity 25wt%, manufacturer Shandong Fentai Biological Technology Co., Ltd., model ft66.

[0047] Polyaspartic acid: manufacturer Zhengzhou Shengyu Chemical Product Co., Ltd., model CY-D2.

[0048] D-Gluconic acid sodium: manufacturer Hebei Runying Biological Technology Co., Ltd., item number 128.

[0049] Polyepoxy succinic acid: manufacturer Runyang Chemical Co., Ltd., item number GY-319.

[0050] Example 1

[0051] A preparation method of a corn water-fertilizer integrated special fertilizer is as follows:

[0052] The jointing period special fertilizer, the big bell mouth period special fertilizer, the tasseling period special fertilizer and the grain filling period special fertilizer are respectively dissolved in water to dilute at a ratio of 1:10 to prepare the jointing period compound liquid fertilizer, the big bell mouth period compound liquid fertilizer, the tasseling period compound liquid fertilizer and the grain filling period compound liquid fertilizer, and then the compound liquid fertilizers are injected into the water-fertilizer integrated irrigation device to drip irrigation fertilization in the corresponding growth development period.

[0053] Specifically, components and amounts of the jointing period special fertilizer, the big bell mouth period special fertilizer, the tasseling period special fertilizer and the grain filling period special fertilizer are as follows:

[0054] (1) The jointing period special fertilizer and the amount, including the following components: urea 6 kg, superphosphate 4 kg, potassium chloride 2 kg, zinc sulfate 1.5 kg, boric acid 1.5 kg, synergist 1 kg;

[0055] The synergist is composed of modified polyaspartic acid 0.4 kg, D-gluconic acid sodium 0.3 kg and polyepoxy succinic acid 0.3 kg.

[0056] (2) The big bell mouth period special fertilizer and the amount, including the following components: urea 12 kg, diammonium phosphate 10 kg, potassium sulfate 2 kg, magnesium sulfate 2 kg, ferrous sulfate 2 kg, synergist 2 kg;

[0057] The synergist is composed of modified polyaspartic acid 0.8 kg, D-gluconic acid sodium 0.6 kg and polyepoxy succinic acid 0.6 kg.

[0058] (3) The tasseling period special fertilizer and the amount, including the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, manganese sulfate 1 kg, synergist 1.5 kg;

[0059] The synergist is composed of modified polyaspartic acid 0.6 kg, D-gluconic acid sodium 0.45 kg and polyepoxy succinic acid 0.45 kg.

[0060] (4) The grain filling period special fertilizer and the amount, including the following components: calcium nitrate 8 kg, fluorapatite 0.5 kg, sodium silicate 2 kg, synergist 1.5 kg;

[0061] The synergist is composed of modified polyaspartic acid 0.6 kg, D-gluconic acid sodium 0.45 kg and polyepoxy succinic acid 0.45 kg.

[0062] The modification method of the modified polyaspartic acid is: 2.5 kg of polyaspartic acid is dissolved in 25 kg of water, 0.25 kg of polyglutamic acid is added, stirring at 110 DEG C for 2 hours, concentrated and dried at 65 DEG C, and ground through a 40 mesh sieve to obtain the modified polyaspartic acid.

[0063] Comparative Example 1

[0064] A preparation method of a corn water-fertilizer integrated special fertilizer is as follows:

[0065] The jointing period special fertilizer, the big bell mouth period special fertilizer, the male stage special fertilizer and the grain filling period special fertilizer are respectively dissolved in water to be diluted at a ratio of 1:10 to prepare the jointing period compound liquid fertilizer, the big bell mouth period compound liquid fertilizer, the male stage compound liquid fertilizer and the grain filling period compound liquid fertilizer, and then the compound liquid fertilizers are injected into the water-fertilizer integrated irrigation device to perform drip irrigation fertilization in the corresponding growth development period.

[0066] Specifically, components and amounts of the jointing period special fertilizer, the big bell mouth period special fertilizer, the male stage special fertilizer and the grain filling period special fertilizer are as follows:

[0067] (1) The jointing period special fertilizer and the amount, including the following components: urea 6 kg, superphosphate 4 kg, potassium chloride 2 kg, zinc sulfate 1.5 kg, boric acid 1.5 kg, and synergist 1 kg;

[0068] The synergist is composed of modified polyaspartic acid 0.4 kg, D-sodium gluconate 0.3 kg and polyepoxysuccinic acid 0.3 kg.

[0069] (2) The big bell mouth period special fertilizer and the amount, including the following components: urea 12 kg, diammonium phosphate 10 kg, potassium sulfate 2 kg, magnesium sulfate 2 kg, ferrous sulfate 2 kg, and synergist 2 kg;

[0070] The synergist is composed of modified polyaspartic acid 0.8 kg, D-sodium gluconate 0.6 kg and polyepoxysuccinic acid 0.6 kg.

[0071] (3) The male stage special fertilizer and the amount, including the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, manganese sulfate 1 kg, and synergist 1.5 kg;

[0072] The synergist is composed of modified polyaspartic acid 0.6 kg, D-sodium gluconate 0.45 kg and polyepoxysuccinic acid 0.45 kg.

[0073] (4) The grain filling period special fertilizer and the amount, including the following components: calcium nitrate 8 kg, fluorapatite 0.5 kg, sodium silicate 2 kg, and synergist 1.5 kg;

[0074] The synergist is composed of modified polyaspartic acid 0.6 kg, D-gluconic acid sodium 0.45 kg, polyepoxysuccinic acid 0.45 kg.

[0075] The modification method of the modified polyaspartic acid is as follows: 2.5 kg of polyaspartic acid is dissolved in 25 kg of water, 0.25 kg of lysine is added, stirring at 110 DEG C for 2 hours, concentrated and dried at 65 DEG C, and ground through a 40 mesh sieve to obtain the modified polyaspartic acid.

[0076] Comparative Example 2

[0077] A preparation method of a corn water-fertilizer integrated special fertilizer is as follows:

[0078] The jointing period special fertilizer, the big bell mouth period special fertilizer, the male stage special fertilizer and the grain filling period special fertilizer are respectively dissolved in water to be diluted at a ratio of 1:10 to prepare the jointing period compound liquid fertilizer, the big bell mouth period compound liquid fertilizer, the male stage compound liquid fertilizer and the grain filling period compound liquid fertilizer, and then the compound liquid fertilizers are injected into a water-fertilizer integrated irrigation device to perform drip irrigation fertilization in the corresponding growth development period.

[0079] Specifically, components and amounts of the jointing period special fertilizer, the big bell mouth period special fertilizer, the male stage special fertilizer and the grain filling period special fertilizer are as follows:

[0080] (1) The jointing period special fertilizer and the amount, including the following components: urea 6 kg, superphosphate 4 kg, potassium chloride 2 kg, zinc sulfate 1.5 kg, boric acid 1.5 kg, synergist 1 kg;

[0081] The synergist is composed of modified polyaspartic acid 0.4 kg, D-gluconic acid sodium 0.3 kg, polyepoxysuccinic acid 0.3 kg.

[0082] (2) The big bell mouth period special fertilizer and the amount, including the following components: urea 12 kg, diammonium phosphate 10 kg, potassium sulfate 2 kg, magnesium sulfate 2 kg, ferrous sulfate 2 kg, synergist 2 kg;

[0083] The synergist is composed of modified polyaspartic acid 0.8 kg, D-gluconic acid sodium 0.6 kg, polyepoxysuccinic acid 0.6 kg.

[0084] (3) The male stage special fertilizer and the amount, including the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, manganese sulfate 1 kg, synergist 1.5 kg;

[0085] The synergist is composed of modified polyaspartic acid 0.6 kg, D-gluconic acid sodium 0.45 kg, polyepoxysuccinic acid 0.45 kg.

[0086] (4) the grouting period special fertilizer and dosage, including the following components: calcium nitrate 8kg, fluorapatite 0.5kg, sodium silicate 2kg, synergist 1.5kg;

[0087] The synergist is composed of modified polyaspartic acid 0.6kg, D-sodium gluconate 0.45kg, polyepoxysuccinic acid 0.45kg.

[0088] The modification method of the modified polyaspartic acid is: dissolving 2.5kg of polyaspartic acid in 25kg of water, adding 0.25kg of glycine, stirring at 110℃ for 2 hours, concentrating and drying at 65℃, and grinding through a 40 mesh sieve to obtain modified polyaspartic acid.

[0089] Comparative Example 3

[0090] A preparation method of a corn water-fertilizer integrated special fertilizer is as follows:

[0091] The jointing period special fertilizer, the big bell mouth period special fertilizer, the tasseling period special fertilizer, and the grouting period special fertilizer are respectively dissolved in water to be diluted at a ratio of 1:10 to prepare jointing period compound liquid fertilizer, big bell mouth period compound liquid fertilizer, tasseling period compound liquid fertilizer, and grouting period compound liquid fertilizer, respectively. Then the compound liquid fertilizers are injected into a water-fertilizer integrated irrigation device to carry out drip irrigation fertilization in the corresponding growth development period.

[0092] Specifically, components and dosages of the jointing period special fertilizer, the big bell mouth period special fertilizer, the tasseling period special fertilizer, and the grouting period special fertilizer are as follows:

[0093] (1) the jointing period special fertilizer and dosage, including the following components: urea 6kg, superphosphate 4kg, potassium chloride 2kg, zinc sulfate 1.5kg, boric acid 1.5kg, synergist 1kg;

[0094] The synergist is composed of modified polyaspartic acid 0.4kg, D-sodium gluconate 0.3kg, polyepoxysuccinic acid 0.3kg.

[0095] (2) the big bell mouth period special fertilizer and dosage, including the following components: urea 12kg, diammonium phosphate 10kg, potassium sulfate 2kg, magnesium sulfate 2kg, ferrous sulfate 2kg, synergist 2kg;

[0096] The synergist is composed of modified polyaspartic acid 0.8kg, D-sodium gluconate 0.6kg, polyepoxysuccinic acid 0.6kg.

[0097] (3) the tasseling period special fertilizer and dosage, including the following components: urea 5kg, potassium sulfate 4kg, superphosphate 4kg, copper sulfate 1kg, manganese sulfate 1kg, synergist 1.5kg;

[0098] The synergist is composed of modified polyaspartic acid 0.6kg, D-sodium gluconate 0.45kg, polyepoxysuccinic acid 0.45kg.

[0099] (4) The special fertilizer for the filling stage and the dosage, including the following components: calcium nitrate 8kg, fluorapatite 0.5kg, sodium silicate 2kg, synergist 1.5kg;

[0100] The synergist is composed of modified polyaspartic acid 0.6kg, D-sodium gluconate 0.45kg, polyepoxysuccinic acid 0.45kg.

[0101] The modification method of the modified polyaspartic acid is: dissolving 2.5kg of polyaspartic acid in 25kg of water, adding 0.25kg of phenylalanine, stirring at 110℃ for 2 hours, concentrating and drying at 65℃, and grinding through a 40 mesh sieve to obtain the modified polyaspartic acid.

[0102] Example 2

[0103] A preparation method of a corn water-fertilizer integrated special fertilizer is as follows:

[0104] The special fertilizer for the jointing stage, the special fertilizer for the big bell mouth stage, the special fertilizer for the tasseling stage, and the special fertilizer for the filling stage are respectively dissolved in water at a dilution ratio of 1:10 to prepare the jointing stage composite liquid fertilizer, the big bell mouth stage composite liquid fertilizer, the tasseling stage composite liquid fertilizer, and the filling stage composite liquid fertilizer, respectively.

[0105] Specifically, the components and dosages of the special fertilizer for the jointing stage, the special fertilizer for the big bell mouth stage, the special fertilizer for the tasseling stage, and the special fertilizer for the filling stage are as follows:

[0106] (1) The special fertilizer for the jointing stage and the dosage, including the following components: urea 6kg, superphosphate 4kg, potassium chloride 2kg, zinc sulfate 1.5kg, boric acid 1.5kg, synergist 1kg;

[0107] The synergist is composed of polyaspartic acid 0.36kg, 0.04kg of polyglutamic acid, D-sodium gluconate 0.3kg, and polyepoxysuccinic acid 0.3kg.

[0108] (2) The special fertilizer for the big bell mouth stage and the dosage, including the following components: urea 12kg, diammonium phosphate 10kg, potassium sulfate 2kg, magnesium sulfate 2kg, ferrous sulfate 2kg, synergist 2kg;

[0109] The synergist is composed of polyaspartic acid 0.72kg, 0.08kg of polyglutamic acid, D-sodium gluconate 0.6kg, and polyepoxysuccinic acid 0.6kg.

[0110] (3) the special fertilizer for the tasseling stage and the dosage, comprising the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, manganese sulfate 1 kg, and synergist 1.5 kg;

[0111] The synergist is composed of 0.54 kg of polyaspartic acid, 0.06 kg of polyglutamic acid, 0.45 kg of sodium D-gluconate, and 0.45 kg of polyepoxysuccinic acid.

[0112] (4) the special fertilizer for the grain filling stage and the dosage, comprising the following components: calcium nitrate 8 kg, fluorapatite 0.5 kg, sodium silicate 2 kg, and synergist 1.5 kg;

[0113] The synergist is composed of 0.54 kg of polyaspartic acid, 0.06 kg of polyglutamic acid, 0.45 kg of sodium D-gluconate, and 0.45 kg of polyepoxysuccinic acid.

[0114] Example 3

[0115] A preparation method of the special fertilizer for corn water-fertilizer integration is as follows:

[0116] The special fertilizers for the jointing stage, the big bell mouth stage, the tasseling stage, and the grain filling stage are respectively dissolved in water at a dilution ratio of 1:10 to prepare the jointing stage compound liquid fertilizer, the big bell mouth stage compound liquid fertilizer, the tasseling stage compound liquid fertilizer, and the grain filling stage compound liquid fertilizer, which are then injected into a water-fertilizer integration irrigation device to perform drip irrigation fertilization in the corresponding growth and development stages.

[0117] Specifically, the components and dosages of the special fertilizers for the jointing stage, the big bell mouth stage, the tasseling stage, and the grain filling stage are as follows:

[0118] (1) the special fertilizer for the jointing stage and the dosage, comprising the following components: urea 6 kg, superphosphate 4 kg, potassium chloride 2 kg, zinc sulfate 1.5 kg, boric acid 1.5 kg, and synergist 1 kg;

[0119] The synergist is composed of 0.4 kg of polyaspartic acid, 0.3 kg of sodium D-gluconate, and 0.3 kg of polyepoxysuccinic acid.

[0120] (2) the special fertilizer for the big bell mouth stage and the dosage, comprising the following components: urea 12 kg, diammonium phosphate 10 kg, potassium sulfate 2 kg, magnesium sulfate 2 kg, ferrous sulfate 2 kg, and synergist 2 kg;

[0121] The synergist is composed of 0.8 kg of polyaspartic acid, 0.6 kg of sodium D-gluconate, and 0.6 kg of polyepoxysuccinic acid.

[0122] (3) the special fertilizer for the tasseling stage and the dosage, comprising the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, manganese sulfate 1 kg, and synergist 1.5 kg;

[0123] The synergist is composed of polyaspartic acid 0.6 kg, D-sodium gluconate 0.45 kg, and polyepoxysuccinic acid 0.45 kg.

[0124] (4) the special fertilizer for the grain filling stage and the dosage, comprising the following components: calcium nitrate 8 kg, fluorapatite 0.5 kg, sodium silicate 2 kg, and synergist 1.5 kg;

[0125] The synergist is composed of polyaspartic acid 0.6 kg, D-sodium gluconate 0.45 kg, and polyepoxysuccinic acid 0.45 kg.

[0126] Comparative Example 4

[0127] A preparation method of the special fertilizer for corn water-fertilizer integration is as follows:

[0128] The special fertilizers for the jointing stage, the big bell mouth stage, the tasseling stage, and the grain filling stage are respectively dissolved in water at a dilution ratio of 1:10 to prepare the jointing stage composite liquid fertilizer, the big bell mouth stage composite liquid fertilizer, the tasseling stage composite liquid fertilizer, and the grain filling stage composite liquid fertilizer, which are then injected into a water-fertilizer integration irrigation device to perform drip irrigation fertilization in the corresponding growth and development stages.

[0129] Specifically, the components and dosages of the special fertilizers for the jointing stage, the big bell mouth stage, the tasseling stage, and the grain filling stage are as follows:

[0130] (1) the special fertilizer for the jointing stage and the dosage, comprising the following components: urea 6 kg, superphosphate 4 kg, potassium chloride 2 kg, zinc sulfate 1.5 kg, and boric acid 1.5 kg.

[0131] (2) the special fertilizer for the big bell mouth stage and the dosage, comprising the following components: urea 12 kg, diammonium phosphate 10 kg, potassium sulfate 2 kg, magnesium sulfate 2 kg, and ferrous sulfate 2 kg.

[0132] (3) the special fertilizer for the tasseling stage and the dosage, comprising the following components: urea 5 kg, potassium sulfate 4 kg, superphosphate 4 kg, copper sulfate 1 kg, and manganese sulfate 1 kg.

[0133] (4) the special fertilizer for the grain filling stage and the dosage, comprising the following components: calcium nitrate 8 kg, fluorapatite 0.5 kg, and sodium silicate 2 kg.

[0134] Example 4

[0135] The application of a corn water and fertilizer integrated special fertilizer in irrigation method is as follows:

[0136] (1) Install a water and fertilizer integrated irrigation device, corresponding to each corn, lay a thin pipe, and the pipe opening is above the corn root;

[0137] (2) After sowing, connect the buried pipe with the drip irrigation tape;

[0138] (3) Calculate the amount of fertilizer for this time according to the specific area of the irrigated and fertilized crops, and weigh or measure the fertilizer for each wheel irrigation area, as follows:

[0139] The use amount of the compound liquid fertilizer at the jointing stage is 4 kg / mu, the water amount at this stage is 300-400 cubic meters / mu, irrigation should be avoided during the corn flowering period, and water should be irrigated before the flowering period;

[0140] When the planting density is 5000 plants / mu, the use amount of the compound liquid fertilizer at the big trumpet stage is 8 kg / mu;

[0141] When the planting density is 5500 plants / mu, the use amount of the compound liquid fertilizer at the big trumpet stage is 9 kg / mu;

[0142] When the planting density is 6000 plants / mu, the use amount of the compound liquid fertilizer at the big trumpet stage is 10 kg / mu;

[0143] When the planting density is 6500 plants / mu, the use amount of the compound liquid fertilizer at the big trumpet stage is 11 kg / mu;

[0144] When the planting density is 7000 plants / mu, the use amount of the compound liquid fertilizer at the big trumpet stage is 12 kg / mu;

[0145] The use amount of the compound liquid fertilizer at the tassel stage is 4 kg / mu, and the water amount at this stage is 400-500 cubic meters / mu;

[0146] The use amount of the compound liquid fertilizer at the filling stage is 4 kg / mu, and the water amount at this stage is 450-550 cubic meters / mu;

[0147] (4) Open the water and fertilizer integrated irrigation device, slowly drip the compound liquid fertilizer and water to the corn root;

[0148] (5) After irrigation, drain the water in the fertilizer tank, and tightly cover the tank cover.

[0149] Test Example 1

[0150] The corn water and fertilizer integrated special fertilizer obtained in Examples 1-3 and Comparative Examples 1-4 was subjected to a field test, and each test object was 1 mu of land, and the test area was 7 mu. According to the method described in Example 4, drip irrigation application was carried out, and the yield per mu of each example and test example under the condition of equal amount of fertilizer was calculated; the yield per mu is the total weight (or quantity) of crops / land area, in kg / mu, and the data is summarized in Table 1.

[0151] The test time is from May 2023 to September 2023; the test site is in Tianjin; and the test variety is Liangyu 99.

[0152] Liangyu 99 is a corn variety selected by Dandong Denghai Liangyu Seed Co., Ltd., with a variety approval number of Guoshuang 2012008. Liangyu 99 is a corn variety with a growth period of about 129 days from emergence to maturity in North China. The variety has compact plant type, tolerance to dense planting, plant height of 270 cm, ear row number of 18-20 rows, red ear shaft, orange grain, not only high yield and stable yield, but also excellent quality, and characteristics of high resistance to lodging, multiple leaf spot, rough shrinkage and fusarium head blight. Under suitable planting conditions, the yield per mu can reach about 1800 kg.

[0153] The use amount of the compound liquid fertilizer at the jointing stage is 4 kg / mu, the water consumption at this stage is 300-400 cubic meters / ha, and irrigation should be avoided during the corn flowering period. Water should be irrigated before flowering, and applied in 2 times with an interval of 10 days;

[0154] The use amount of the compound liquid fertilizer at the large trumpet stage is 8 kg / mu when the planting density is 5000 plants / mu, and is applied in 4 times with an interval of 7 days;

[0155] The use amount of the compound liquid fertilizer at the tasseling stage is 4 kg / mu, the water consumption at this stage is 400-500 cubic meters / ha, and is applied in 4 times with an interval of 7 days;

[0156] The use amount of the compound liquid fertilizer at the filling stage is 4 kg / mu, the water consumption at this stage is 450-550 cubic meters / ha, and is applied in 4 times with an interval of 10 days.

[0157] Table 1 Yield per mu

[0158]

[0159] Compared with Test Example 1, in the field test of the water and fertilizer integrated special fertilizer of Example 1-3 and Comparative Example 1-4, the yield of Example 1 and Comparative Example 1-3 is obviously higher than that of Example 2-3, which indicates that the use of modified polyaspartic acid in the synergist of Example 1 and Comparative Example 1-3 has a positive effect on improving the yield of corn compared with polyaspartic acid. The yield per mu of Comparative Example 4 is the lowest among the yield per mu of other examples and comparative examples. The fertilizer formula of Comparative Example 4 is only the base fertilizer without adding polyaspartic acid, modified polyaspartic acid, D-sodium gluconate and polyepoxysuccinic acid to prepare the synergist. It can be seen that the addition of the synergist and the components of the synergist play a role in improving the efficiency of the fertilizer and the final crop yield. Example 1 modifies polyaspartic acid with polyglutamic acid as a modifier, and the yield per mu at harvest is 995 kg / mu. Comparative Example 1 modifies polyaspartic acid with lysine as a modifier, Comparative Example 2 modifies polyaspartic acid with glycine as a modifier, and Comparative Example 3 modifies polyaspartic acid with phenylalanine as a modifier. The yield per mu of Comparative Examples 1-3 is between 978-982 kg / mu, which is lower than that of Example 1. This indicates that different amino acid modifiers can affect the performance of polyaspartic acid. The type and structure of amino acids can affect the interaction between polyaspartic acid and the stability of polyaspartic acid in the soil, thereby affecting the absorption of nutrients by crops. The chelating ability and soil improvement effect of modified polyaspartic acid will affect the final yield per mu. The yield per mu of Example 1 is the highest, which can indicate that the bioavailability of nutrients and the utilization rate of the composite liquid fertilizer in the water and fertilizer integrated special fertilizer are the highest.

[0160] Test Example 2

[0161] After the end of Test Example 1, the soil of the corn water and fertilizer integrated special fertilizer field test of Example 1-3 and Comparative Example 1-4 was detected for soil acidity. The test steps are according to the industry standard NY / T 1121.2-2006 "Soil Testing Part 2: Determination of Soil pH". When the pH glass electrode and the mercury-mercury electrode are inserted into the soil suspension, a battery reaction is formed between the two, and an electric potential difference is generated between them. Since the potential of the reference electrode is fixed, the size of the electric potential difference is determined by the hydrogen ion activity in the test solution, and its negative logarithm is the pH value, which can be directly read on the pH meter, that is, the pH value of the soil in this area. In each test area, the soil acidity of 6 areas is detected on average, and the test data is averaged, as shown in Table 2.

[0162] Table 2 Summary of soil acidity

[0163] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 2 Example 3 Comparative Example 4 pH value 6.88 6.85 6.84 6.84 6.34 6.34 6.25

[0164] The change of soil pH value is affected by many factors, including but not limited to the addition of acid-base substances in the soil, the decomposition of organic matter, microbial activity, fertilizer application, the pH value of precipitation and irrigation water, etc. Test Example 2 sampled and measured the pH value of the soil after the end of the field test of Test Example 1 and concluded that the soil pH value of Example 1 was closest to neutral, the pH values of Examples 2-3 and Comparative Example 4 were significantly lower than those of Example 1 and Comparative Examples 1-3, and the lower soil pH value indicated a higher degree of soil acidification, which could indicate that the addition of the synergist to the special fertilizer had a beneficial effect on reducing the pH value and could reduce the soil acidity to a certain extent. The sodium D-glucuronate in the synergist can neutralize the acidic substances in the soil through its sodium ions, the polyepoxysuccinic acid can adsorb the acidic substances in the soil to reduce the concentration of hydrogen ions in the soil, and the modified polyaspartic acid can improve the soil and promote microbial activity to accelerate the decomposition of organic matter, further affecting the soil acidity, and ultimately helping to reduce the soil acidity.

[0165] By comparing Example 1 with Comparative Examples 1-3, it was proved that different amino acid modifiers would have different effects on soil acidity. Example 1 used polyglutamic acid as a modifier, Comparative Example 1 used lysine as a modifier, Comparative Example 2 used glycine, and Comparative Example 3 used phenylalanine. In terms of numerical values, the pH values of Comparative Examples 1-3 were only slightly lower than that of Example 1, and their effects on alleviating soil acidification were not as significant as polyglutamic acid. This may be due to the different structures and chemical properties of different amino acids, which affect the acid-base reaction in the soil and thus affect the acid-base balance of the soil. The chelating ability of modified polyaspartic acid obtained from different amino acids and the effect on microbial activity in the soil may also have an indirect effect on the pH value of the soil.

[0166] Test Example 3

[0167] Negative pressure blockage refers to the phenomenon that during the use of the buried drip irrigation pipe, the soil particles around the dripping hole are sucked into the dripping flow channel in the dripping element due to negative pressure, resulting in the dripping function of the dripping element of the drip irrigation pipe failing to meet the requirements. When the water and fertilizer integrated irrigation device is fertilizing, the buried negative pressure can cause soil particles to be sucked into the drip irrigation pipe, causing blockage and affecting the irrigation efficiency. Iron or magnesium in liquid fertilizer is easily oxidized to form a precipitate when it comes into contact with oxygen in the air, or calcium carbonate and magnesium carbonate precipitates are easily produced when the pH and hardness of water are too high. To prevent negative pressure blockage, water pressure balance can be maintained, the filtration system can be optimized, and the composite liquid fertilizer can be ensured to be fully dissolved and free of water scale, etc.

[0168] Test Example 3: Anti-negative pressure blocking performance test of corn water and fertilizer integrated special fertilizer prepared by the preparation method of Examples 1-3 and Comparative Examples 1-4. The test procedure is according to the national standard GB / T 19812.5-2019 "Plastic water-saving irrigation equipment Part 5: Buried drip irrigation pipe". The water inlet valve is connected to the composite liquid fertilizer of corn water and fertilizer integrated special fertilizer. There are 20 drip holes in each test group. Finally, the number of blocked drip heads is calculated (%). The summary is shown in Table 3.

[0169] Table 3: Summary of the number of blocked drip heads

[0170]

[0171]

[0172] From the comparison of the anti-negative pressure blocking performance test of Test Example 3, it can be seen that the synergist of Example 1 contains polyaspartic acid modified by polyglutamic acid. By forming stable chelates with calcium and magnesium ions in water, it reduces the deposition of scale and soil particles at the drip head, thereby achieving a 0% blockage rate. The synergists of Comparative Examples 1-3 use lysine, glycine and phenylalanine as modifiers to obtain modified polyaspartic acid. The chelating ability of the modified polyaspartic acid may not be as good as that of Example 1, resulting in slightly lower performance in anti-negative pressure blocking than Example 1, with a blockage rate of 5%. The polyaspartic acid in the synergists of Examples 2-3 is not modified. The difference is that the synergist of Example 2 contains only glutamic acid, and the synergist of Example 3 does not contain glutamic acid. The anti-blocking performance is lower than that of Example 1, indicating that the modified product has stronger water quality management ability, ensuring that the composite liquid fertilizer can be fully dissolved without scale. Comparative Example 4 does not add any synergist, and its anti-negative pressure blocking performance is the worst, with a blockage rate of 15%, proving that the addition of synergist and its composition have beneficial effects on improving the anti-negative pressure blocking performance of the drip irrigation system.

[0173] The above describes in detail the preferred embodiments of the present application. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A corn water and fertilizer integrated special fertilizer, characterized in that, Comprise: jointing stage special fertilizer, big trumpet mouth period special fertilizer, male stage special fertilizer, grain filling stage special fertilizer; The jointing stage special fertilizer, big trumpet mouth period special fertilizer, male stage special fertilizer, grain filling stage special fertilizer components and dosage are as follows: (1) the jointing stage special fertilizer, comprising the following components by weight: urea 6-8 parts, superphosphate 4-6 parts, potassium chloride 2-4 parts, zinc sulfate 1-2 parts, boric acid 1-2 parts, synergist 1-2 parts; (2) the big trumpet mouth period special fertilizer, comprising the following components by weight: urea 10-12 parts, diammonium phosphate 8-10 parts, potassium sulfate 1-2 parts, magnesium sulfate 1-2 parts, ferrous sulfate 1-2 parts, synergist 1-2 parts; (3) the male stage special fertilizer, comprising the following components by weight: urea 4-6 parts, potassium sulfate 4-6 parts, superphosphate 4-6 parts, copper sulfate 1-2 parts, manganese sulfate 1-2 parts, synergist 1-2 parts; (4) the grain filling stage special fertilizer, comprising the following components by weight: calcium nitrate 6-8 parts, fluorapatite 0.1-1 parts, sodium silicate 1-2 parts, synergist 1-2 parts; The synergist is a mixture of modified polyaspartic acid, D-sodium gluconate and polyepoxysuccinic acid; the weight components of the synergist are: modified polyaspartic acid 0.4-0.8 parts, D-sodium gluconate 0.3-0.6 parts, polyepoxysuccinic acid 0.3-0.6 parts; The modification method of modified polyaspartic acid is: dissolving polyaspartic acid in water, adding polyglutamic acid, stirring at 100-120℃ for 2-4 hours, concentrating and drying at 60-70℃, grinding and sieving to obtain modified polyaspartic acid; the amount ratio of polyaspartic acid, water and polyglutamic acid is 1.5-2.5:15-25:0.2-0.

4.

2. The corn water and fertilizer integrated special-purpose fertilizer according to claim 1, characterized in that, The grinding and sieving is 40-50 mesh.

3. The use of the corn water and fertilizer integrated special fertilizer according to any one of claims 1-2, characterized in that, The application method is as follows: Dissolve the jointing stage special fertilizer, big trumpet mouth period special fertilizer, male stage special fertilizer and grain filling stage special fertilizer in water respectively to prepare jointing stage compound liquid fertilizer, big trumpet mouth period compound liquid fertilizer, male stage compound liquid fertilizer and grain filling stage compound liquid fertilizer respectively by dilution at a ratio of 1:10, and then inject the compound liquid fertilizer into water and fertilizer integrated irrigation device for drip irrigation fertilization in the corresponding growth period.

4. The application of the corn water and fertilizer integrated special fertilizer according to claim 3, characterized in that, The application method is as follows: (1) install water and fertilizer integrated irrigation device, lay one thin pipe for each corn, and the pipe opening is above the corn root; (2) connect the buried pipe with the drip irrigation belt after sowing; (3) calculate the amount of fertilizer for this time according to the specific area of the irrigated and fertilized crops, and weigh or measure the fertilizer for each irrigation area, as follows: The jointing stage compound liquid fertilizer is used in an amount of 4-5 kg / acre, the water consumption in this stage is 300-400 cubic meters / acre, and irrigation should be avoided during the corn flowering period, and should be done before flowering; When the planting density is 5000-5499 plants / acre, the big trumpet mouth period compound liquid fertilizer is used in an amount of 8-8.5 kg / acre; When the planting density is 5500-5999 plants / acre, the big trumpet mouth period compound liquid fertilizer is used in an amount of 9-9.5 kg / acre; When the planting density is 6000-6499 plants / acre, the big trumpet mouth period compound liquid fertilizer is used in an amount of 10-10.5 kg / acre; When the planting density is 6500-6999 plants / acre, the big trumpet mouth period compound liquid fertilizer is used in an amount of 11-11.5 kg / acre; The compound liquid fertilizer is used in an amount of 11-11.5 kg per mu when the planting density is 6500-6999 plants per mu; The compound liquid fertilizer is used in an amount of 12-12.5 kg per mu when the planting density is 7000-7499 plants per mu; The compound liquid fertilizer is used in an amount of 4-5 kg per mu during the male plucking period, and the water consumption is 400-500 cubic meters per hectare during this stage; The compound liquid fertilizer is used in an amount of 4-5 kg per mu during the grain filling period, and the water consumption is 450-550 cubic meters per hectare during this stage; (4) Turn on the water and fertilizer integrated irrigation device, and slowly drip the compound liquid fertilizer and water to the root of the corn; (5) Drain the water in the fertilizer tank after irrigation, and tightly cover the tank cover.

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