High-yield corn cultivation method

Abstract

The invention belongs to the technical field of corn cultivation, and relates to a high-yield corn cultivation method which comprises the following steps: cultivating robust seedlings by adopting a seedling culture substrate with a specific formula, and spraying a root-promoting and growth-promoting nutrient solution; base fertilizer and functional matrix are laid in the planting pits in a layered mode during transplanting, so that a friendly root system environment is created; layered and positioned root precise topdressing is carried out in the jointing stage; special leaf fertilizers are sprayed in the jointing stage, the tasseling and silking stage and the early grouting stage respectively. Through integration of strong seedling cultivation, stress reduction transplanting, segmented accurate fertilizer and water management and soil ecological cultivation, the problems of weak seedling stress resistance, large transplanting stress, low fertilizer utilization rate, extensive water management and the like in traditional cultivation are systematically solved. By applying the method, corn root development can be remarkably promoted, plant stress resistance is enhanced, water and fertilizer utilization efficiency is improved, and accordingly remarkable yield increase and quality improvement of corn are achieved.

Description

Technical Field

[0001] This invention belongs to the field of maize cultivation technology and relates to a high-yield maize cultivation method. Background Technology

[0002] As a globally important food and feed crop, maize cultivation techniques have long revolved around soil tillage, variety selection, planting density, fertilizer application, and water management. Traditional and current mainstream maize cultivation methods generally suffer from the following shortcomings: 1) The seedling raising process is extensive, resulting in weak seedling resistance. Current technologies mostly employ direct sowing in the field or simple seedling trays, with arbitrary substrate preparation and a lack of systematic nutritional design for maize seedling root development and stress resistance. Poor root development and weak stress resistance during the seedling stage often lead to a long recovery period and low survival rate after transplanting. This is especially true in regions with drastic climate changes, where seedlings are susceptible to stresses such as low temperatures and drought, posing a threat to high and stable yields later on.

[0003] 2) Transplanting causes significant stress and creates an unfriendly root environment. Conventional transplanting methods often involve directly transplanting seedlings from the nursery environment into the field, resulting in a drastic change in the environment around the roots. Current technologies rarely involve fine-grained stratification within the planting hole, leaving a lack of continuous and slow-release nutrient reservoirs below the roots. This hinders the roots from quickly adapting to the new environment and growing deeper, affecting the plant's ability to utilize deep water and nutrients and limiting its drought resistance and overall growth.

[0004] 3) The fertilization strategy is singular and the nutrient utilization rate is low. Current cultivation methods rely heavily on one-time application of base fertilizer or the timing and method of topdressing, which are relatively extensive. The nitrogen, phosphorus and potassium ratios are fixed, and there is a lack of precise nutrient design based on the different growth stages of corn (such as strengthening stalks and promoting ear formation during the jointing stage, promoting flowering and pollen retention during the tasseling stage, and increasing weight and improving quality during the grain filling stage). Fertilizers are prone to volatilization, leaching or fixation, and the utilization rate is generally low, which not only increases production costs but may also cause environmental pollution.

[0005] 4) Water management lacks precise, segmented control. Traditional irrigation often relies on experience and lacks a mechanism for precise control based on the water sensitivity and demand patterns of maize at different growth stages. For example, excessive water during the jointing stage can lead to excessive vegetative growth, insufficient water during the tasseling stage can severely affect pollination, and excessive water in the late grain-filling stage can delay maturity and affect quality. Existing technologies fail to systematically combine soil moisture content indicators with key growth stages, making it difficult to achieve a synergistic effect between efficient water use and maximum yield formation.

[0006] 5) Insufficient attention to soil health and biological activity, coupled with long-term continuous cropping and the extensive use of chemical fertilizers, has led to prominent problems such as soil compaction, decline in organic matter, and imbalance of the microbial community. Existing cultivation methods typically focus on chemical nutrient supply, while the application of comprehensive measures to improve soil structure, activate soil biological activity, and promote nutrient transformation and root health by adding specific functional microbial agents and organic materials is insufficient, thus limiting the improvement of sustainable soil productivity. Summary of the Invention

[0007] To address the above problems, this invention provides a high-yield corn cultivation method, specifically comprising the following steps: Step 1: Spread corn seeds at a concentration of 450-500g / m³ 3 Sow seeds at the appropriate density in the seedling substrate. From seed emergence to the stage of one leaf and one bud, spray with root-promoting nutrient solution 1-2 times at a rate of 150-200 mL / m². 2 From the time the seedlings have two leaves and one bud until transplanting, spray them 2-3 times with a growth-promoting nutrient solution, at a rate of 150-200 mL / m². 2 After transplanting the seedlings, the seedling substrate should be retained for future use.

[0008] Preferably, the seedling substrate comprises decomposed straw, decomposed manure, attapulgite soil, vermiculite, perlite, soybean meal powder, compound fertilizer, and compound microbial powder, in a mass ratio of (30-40):(15-25):(10-20):(8-12):(8-12):(4-6):(1-2):1. Most preferably, the decomposed straw is decomposed corn straw, the decomposed manure is decomposed cow manure, the compound fertilizer is 15-15-15 compound fertilizer, and the compound microbial powder is Bacillus subtilis powder, Bacillus mucilaginosus powder, and Trichoderma harzianum powder, in a mass ratio of (2-3):(1-2):(1-2).

[0009] Preferably, the root-promoting nutrient solution, based on water, comprises 0.2-0.4 g / L potassium dihydrogen phosphate, 0.15-0.25 g / L magnesium sulfate, 0.1-0.2 g / L seaweed extract, and 40-60 mg / L betaine.

[0010] Preferably, the growth-promoting nutrient solution, based on water, comprises 0.7-0.9 g / L urea, 0.35-0.45 g / L potassium dihydrogen phosphate, 0.2-0.4 g / L magnesium sulfate, and 0.2-0.3 g / L seaweed extract.

[0011] Step Two: 7-10 days before transplanting, prepare the land by deep tilling to a depth of 30-35cm. Dig planting holes according to a wide-narrow row spacing: 75-85cm for wide rows and 35-45cm for narrow rows, with a plant spacing of 20-30cm. The planting hole diameter should be 25-35cm and the depth 27-29cm. In the planting hole, layer 7-9cm of base fertilizer and 16-18cm of functional substrate from bottom to top, and finally cover with 2-3cm of field soil before transplanting the seedlings. This step places the seedling roots in a friendly microenvironment composed of the original seedling substrate. The base fertilizer layer below and around the roots provides a continuous, layered nutrient reservoir for downward and outward root extension, greatly reducing transplanting stress and guiding deep root development.

[0012] Preferably, the base fertilizer comprises well-rotted straw, well-rotted manure, and calcium magnesium phosphate fertilizer in a mass ratio of (4-6):(4-6):(2-4). Most preferably, the well-rotted straw is well-rotted corn straw, the well-rotted manure is well-rotted cow manure, and the calcium magnesium phosphate fertilizer has a P2O5 content ≥15%, a CaO content ≥40%, and a MgO content ≥12%.

[0013] Preferably, the functional substrate comprises seedling substrate, urea and potassium sulfate in a mass ratio of (40-60):(2-3):(1-2).

[0014] Step 3: When the corn plants reach the jointing stage, apply 8-12 kg / mu of ammonium polyphosphate and 10-15 kg / mu of calcium ammonium nitrate in a trench 15-20 cm away from the base of the corn plant stem. This topdressing aims to strongly promote robust stems and ear differentiation. Deep application can reduce nitrogen volatilization, and ammonium polyphosphate facilitates the movement of phosphorus in the soil and improves its utilization rate.

[0015] When the corn plants reach the jointing stage, apply 20-30 kg / mu of urea, 18-22 kg / mu of potassium sulfate, and 80-120 kg / mu of functional substrate in a 10-15 cm trench 25-30 cm away from the plant.

[0016] Preferably, the ammonium polyphosphate (P2O5) content is ≥40%.

[0017] Step 4: During the jointing stage of corn plants, combine with root fertilization by spraying 30-40L / mu of foliar fertilizer to promote ear growth, 1-2 times, with an interval of 6-7 days; during the tasseling and silking stage of corn plants, spray 40-50L / mu of foliar fertilizer to promote flowering, 1-2 times, with an interval of 7-8 days; during the early grain-filling stage of corn plants, spray 40-50L / mu of foliar fertilizer to promote weight gain, 1-2 times, with an interval of 9-10 days.

[0018] Preferably, the foliar fertilizer for increasing spikelets comprises, based on water, 4-6 g / L urea, 2-4 g / L potassium dihydrogen phosphate, 1-2 g / L zinc sulfate, and 8-12 mg / L brassinolide.

[0019] Preferably, the flower-promoting foliar fertilizer, based on water, comprises 4-6 g / L potassium nitrate, 0.4-0.6 g / L boric acid, 0.2-0.4 g / L manganese sulfate, and 0.1-0.3 g / L alginic acid.

[0020] Preferably, the weight-enhancing foliar fertilizer, based on water, comprises 5-7 g / L potassium dihydrogen phosphate, 1-3 g / L urea, and 0.8-1.2 g / L magnesium sulfate.

[0021] Step 5: Transplant the seedlings to the jointing stage of the corn plants, maintaining a soil moisture content of 60%-65% to promote root development and prevent excessive growth.

[0022] During the jointing stage of corn plants, maintain the relative soil moisture content at 70%-75% and combine it with topdressing to promote stem and leaf growth.

[0023] From the tasseling stage to the large trumpet stage of corn plants, sufficient water must be ensured, maintaining a relative soil moisture content of 75%-85%. If the soil moisture content is ≤40%, irrigation should be carried out for 30-40 minutes. 3 / mu.

[0024] Maintaining a soil relative moisture content of 70%-80% during the corn stalk grain-filling stage is beneficial for the transfer of photosynthetic products to the grains. Irrigate 1-2 times during this period, with each irrigation providing 30-40 cubic meters of water. 3 / mu.

[0025] About 15 days before harvest, the relative soil moisture content drops to below 60% to promote grain dehydration and maturation.

[0026] The present invention has the following advantages: 1) Compared to existing extensive seedling cultivation methods, this invention combines a specially formulated seedling substrate (containing decomposed organic matter, inorganic support, soybean meal powder, and compound functional microbial powder) with segmented, precise nutrient solutions (root-promoting solution and growth-promoting solution) for spraying, systematically promoting root development and robust stems in the early stages of seedling growth. Its advantages include: high seedling vigor, dark green leaves, strong root vitality, and strong stress resistance even before transplanting, laying a solid physiological foundation for coping with changes in the transplanting environment and subsequent biotic and abiotic stresses, effectively solving the problems of weak seedlings and slow seedling establishment associated with traditional methods.

[0027] 2) Addressing the issue of high stress during traditional transplanting, this invention innovatively constructs a three-dimensional structure within the planting hole: a base fertilizer layer, a functional substrate layer, and a soil covering layer. The seedling substrate is reused and mixed with urea and potassium sulfate to create a functional substrate, which surrounds the seedling roots. Its significant advantages lie in greatly mitigating the drastic changes in the root environment caused by transplanting, significantly shortening the recovery period, and improving the survival rate. Simultaneously, the lower layer of base fertilizer and the surrounding functional substrate create a gradient of nutrient release, effectively inducing the roots to extend deeper into the soil and outwards, enhancing the plant's drought resistance and nutrient absorption range in the later stages.

[0028] 3) This invention changes the traditional extensive fertilization model. Based on the specific physiological needs of key growth stages of maize, such as the jointing stage, tasseling and silking stage, and early grain-filling stage, it designs a precise model combining root topdressing and foliar fertilization. For example, during the jointing stage, ammonium polyphosphate and calcium ammonium nitrate are applied deeply at close range to strengthen the stems and promote ear differentiation, while urea, potassium sulfate, and functional substrates are applied at medium distance to provide continuous nutrition. At each stage, specially developed foliar fertilizers for increasing ears, promoting flowering, and increasing weight are added. Its advantages lie in achieving a high degree of alignment between nutrient supply and the key periods for maize yield formation, significantly improving fertilizer utilization, and reducing nutrient loss and environmental pollution risks. This precise regulation effectively promotes strong stems to prevent lodging, promotes ear differentiation to increase the number of grains per ear, ensures pollination and fertilization to improve the seed setting rate, and accelerates grain filling to increase the thousand-grain weight.

[0029] 4) This invention clarifies specific control indicators and irrigation amounts for soil moisture content (or relative moisture content) at each stage, from transplanting, jointing stage, large trumpet stage to tasseling stage, grain filling stage, and finally to harvest. Its advantages lie in ensuring sufficient water for corn during critical water-demand periods (such as tasseling stage), preventing yield reduction due to drought; controlling water during water-sensitive but not excessively water-demanding periods (such as jointing stage) to prevent excessive vegetative growth; and reducing moisture content in the later grain filling stage to promote grain dehydration and maturation, improving quality. This refined water management model achieves a balance between water conservation and high yield, effectively avoiding yield fluctuations caused by uneven drought and flooding in traditional methods.

[0030] (5) This invention incorporates the concept of healthy soil cultivation throughout, using compound microbial powder (containing Bacillus subtilis, Bacillus mucilaginosus, Trichoderma harzianum, etc.) in conjunction with a large amount of well-rotted organic materials (straw, cow manure). These measures not only improve soil aggregate structure and increase organic matter content, but also activate nutrients fixed in the soil, inhibit soil-borne pathogens, and promote root growth. Thus, while providing crop nutrition, it gradually repairs and enhances the soil microecology, strengthens the soil's buffering capacity and sustainable production capacity, and overcomes the drawbacks of traditional cultivation's over-reliance on chemical fertilizers. Detailed Implementation

[0031] The technical solutions in the embodiments of the invention are described clearly and completely 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.

[0032] Example 1 Raw material preparation: The compound microbial powder consists of Bacillus subtilis powder (purchased from Jinan Jianhui Chemical Co., Ltd.), Bacillus jellyoides powder (purchased from Shandong Ruiyuan Biotechnology Co., Ltd.), and Trichoderma harzianum powder (purchased from Shandong Nuojie Biotechnology Co., Ltd.), with a mass ratio of 3:2:2.

[0033] Seedling substrate: well-rotted corn stalks, well-rotted cow manure, attapulgite soil, vermiculite, perlite, soybean meal powder, 15-15-15 compound fertilizer and compound microbial powder, with a mass ratio of 35:20:15:10:10:5:1.5:1.

[0034] Root-promoting nutrient solution: Based on water, it includes 0.3 g / L potassium dihydrogen phosphate, 0.2 g / L magnesium sulfate, 0.15 g / L seaweed extract (purchased from Lanzhou Waterles Biotechnology Co., Ltd.) and 50 mg / L betaine.

[0035] Growth-promoting nutrient solution: Based on water, it includes 0.8 g / L urea, 0.4 g / L potassium dihydrogen phosphate, 0.3 g / L magnesium sulfate, and 0.25 g / L seaweed extract (purchased from Lanzhou Waterles Biotechnology Co., Ltd.).

[0036] Base fertilizer: well-rotted corn stalks, well-rotted cow manure, and calcium magnesium phosphate fertilizer (P2O5 content ≥15%, CaO content ≥40%, MgO content ≥12%), in a mass ratio of 5:5:3.

[0037] Functional substrate: seedling substrate, urea and potassium sulfate, in a mass ratio of 50:2.5:1.5.

[0038] Foliar fertilizer for increasing spikelets: Based on water, it includes 5 g / L urea, 3 g / L potassium dihydrogen phosphate, 1.5 g / L zinc sulfate and 10 mg / L brassinolide.

[0039] Foliar fertilizer to promote flowering: Based on water, it includes 5g / L potassium nitrate, 0.5g / L boric acid, 0.3g / L manganese sulfate and 0.2g / L alginic acid.

[0040] Foliar fertilizer for increasing body weight: Based on water, it includes 6g / L potassium dihydrogen phosphate, 2g / L urea and 1g / L magnesium sulfate.

[0041] Step 1: Mix the corn seeds at 475g / m³ 3Sow seeds at the appropriate density in the seedling substrate. Spray once with a root-promoting nutrient solution during the period from seed emergence to the first leaf and one bud stage, at a rate of 175 mL / m². 2 From the time the seedlings have two leaves and one bud until transplanting, spray them twice with a growth-promoting nutrient solution at a rate of 185 mL / m². 2 After transplanting the seedlings, the seedling substrate should be retained for future use.

[0042] Step 2: Prepare the land 9 days before transplanting the seedlings. Deeply cultivate the soil to a depth of 33cm. Dig planting holes according to the width and narrow row spacing, with a width of 80cm and a narrow row spacing of 40cm. The plant spacing is 25cm, the diameter of the planting hole is 30cm, and the depth is 28cm. In the planting hole, lay 8cm of base fertilizer and 17cm of functional substrate from bottom to top. Finally, cover with 3cm of field soil and then transplant the seedlings.

[0043] Step 3: When the corn plants reach the jointing stage, apply 10 kg / mu of ammonium polyphosphate (ammonium polyphosphate with a P2O5 content of 45%) and 13 kg / mu of calcium ammonium nitrate in a trench 18 cm away from the base of the corn plant stem.

[0044] When the corn plants reach the jointing stage, apply 25 kg / mu of urea, 20 kg / mu of potassium sulfate, and 100 kg / mu of functional substrate in a 13 cm trench 28 cm away from the plant.

[0045] Step 4: During the jointing stage of corn plants, apply 35L / mu of foliar fertilizer to promote ear growth, once, with an interval of 6 days; during the tasseling and silking stage of corn plants, apply 45L / mu of foliar fertilizer to promote flowering, twice, with an interval of 8 days; during the early grain-filling stage of corn plants, apply 45L / mu of foliar fertilizer to promote weight gain, twice, with an interval of 10 days.

[0046] Step 5: From the seedling transplanting stage to the corn jointing stage, maintain a soil moisture content of 62%-64%. During the corn jointing stage, maintain a relative soil moisture content of 72%-73%. From the large trumpet stage to the tasseling stage, maintain a relative soil moisture content of 78%-82%. If the soil moisture content is ≤40%, irrigate with 35m³ of water. 3 / mu. Maintain soil relative moisture content at 73%-77% during the corn stalk grain-filling stage, irrigating twice during this period, with each irrigation providing 30-40 cubic meters of water. 3 / mu. About 15 days before harvest, the relative soil moisture content drops to below 60%.

[0047] Experimental Example 1 Experimental group: The high-yield maize cultivation method of Example 1 was adopted. Other field management methods such as disease and pest control were referred to "High-quality and high-efficiency maize cultivation technology" edited by Yu Qinglai.

[0048] Control group: based entirely on "High-Quality and High-Efficiency Maize Cultivation Techniques", edited by Yu Qinglai.

[0049] Experimental area: Each group has 3 replicate plots, and each plot has an area of ​​1 mu (approximately 0.16 acres).

[0050] Specific location: Experimental field of Luoyang Academy of Agricultural and Forestry Sciences, Henan Province.

[0051] Experimental variety: Yufeng 303.

[0052] Experimental period: May to October 2023 (a complete corn growing season), with sowing and seedling raising in May and transplanting after wheat harvest in June.

[0053] Agronomic traits were measured: Ten plants were randomly sampled from each plot at the jointing stage, tasseling stage, and mid-grain filling stage to measure plant height, stem diameter, leaf area index, and SPAD value (relative chlorophyll content).

[0054] Yield determination: The actual yield of each plot at maturity is calculated, and 10 ears are sampled for seed testing. The ear length, ear diameter, tip barrenness length, number of rows per ear, number of grains per row, thousand-grain weight, and yield per mu are measured.

[0055] Quality analysis: A mixed sample of grains was sent for testing to determine the content of crude protein, crude fat, and starch.

[0056] Table 1 Comparison of agronomic traits during key growth periods

[0057] Table 2 Production Comparison

[0058] Table 3 Quality Comparison

[0059] Field comparative trials using the above-mentioned system show that the high-yield maize cultivation method provided by this invention significantly promotes plant growth. Plant height, stem diameter, leaf area index, and chlorophyll content at each growth stage are significantly better than the control group, resulting in more robust plants. This invention, through precise regulation of ear promotion, flowering promotion, and weight gain, effectively increases the number of ears per mu, the number of grains per ear, and the thousand-grain weight, thereby achieving a yield of 812.6 kg per mu, an increase of 18.9% compared to the traditional method (683.4 kg), with a statistically significant difference. The crude protein and starch content in the grains are increased by approximately 10.3% and 2.4% respectively compared to the control group, resulting in superior marketability and nutritional quality.

[0060] The above experimental data fully demonstrate that this invention, through integrated technologies such as seedling cultivation, three-dimensional planting, precise fertilization and irrigation, and segmented regulation, can systematically solve many problems existing in traditional cultivation and achieve a significant synergistic improvement in corn yield and quality.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-yield corn cultivation method, characterized in that, Includes the following steps: Step 1: Sow corn seeds in the seedling substrate. From seed emergence to the point where the seedling has one leaf and one bud, spray with a root-promoting nutrient solution at a rate of 150-200 mL / m². 2 From the time the seedlings have two leaves and one bud until transplanting, spray with a growth-promoting nutrient solution at a rate of 150-200 mL / m². 2 The seedling substrate should be retained for future use after transplanting. Step 2: Before transplanting the seedlings, till the soil, dig planting holes, and lay base fertilizer and functional substrate in the planting holes from bottom to top. Finally, cover with field soil and then transplant the seedlings. The functional substrate includes seedling substrate, urea and potassium sulfate in a mass ratio of (40-60):(2-3):(1-2). Step 3: When the corn plants reach the jointing stage, apply 8-12 kg / mu of ammonium polyphosphate and 10-15 kg / mu of calcium ammonium nitrate in trenches 15-20 cm away from the base of the corn plant stem. When the corn plants reach the jointing stage, apply 20-30 kg / mu of urea, 18-22 kg / mu of potassium sulfate, and 80-120 kg / mu of functional substrate in a trench 25-30 cm away from the plant. Step 4: During the jointing stage of corn plants, apply 30-40 L / mu of foliar fertilizer to promote ear growth; during the tasseling and silking stage of corn plants, apply 40-50 L / mu of foliar fertilizer to promote flowering; and during the early grain-filling stage of corn plants, apply 40-50 L / mu of foliar fertilizer to promote weight gain. Step 5: Transplant the seedlings to the jointing stage of the corn plants, maintaining a soil moisture content of 60%-65%; Maintain soil relative moisture content at 70%-75% during the corn plant jointing stage; From the tasseling stage to the large trumpet stage of corn plants, maintain the relative soil moisture content at 75%-85%. If the soil moisture content is ≤40%, irrigate for 30-40 minutes. 3 / mu; During the corn stalk filling stage, maintain the soil relative moisture content at 70%-80%, and irrigate 1-2 times during this period, with each irrigation providing 30-40 cubic meters of water. 3 / mu; the relative soil moisture content should be reduced to below 60% before harvest.

2. The method for high-yield maize cultivation according to claim 1, characterized in that, The seedling substrate mentioned in step one includes decomposed straw, decomposed manure, attapulgite soil, vermiculite, perlite, soybean meal powder, compound fertilizer and compound microbial powder, with a mass ratio of (30-40):(15-25):(10-20):(8-12):(8-12):(4-6):(1-2):

1.

3. The method for high-yield maize cultivation according to claim 1, characterized in that, The root-promoting nutrient solution mentioned in step one, based on water, includes 0.2-0.4 g / L potassium dihydrogen phosphate, 0.15-0.25 g / L magnesium sulfate, 0.1-0.2 g / L seaweed extract, and 40-60 mg / L betaine.

4. The high-yield maize cultivation method according to claim 1, characterized in that, The growth-promoting nutrient solution mentioned in step one, based on water, includes 0.7-0.9 g / L urea, 0.35-0.45 g / L potassium dihydrogen phosphate, 0.2-0.4 g / L magnesium sulfate, and 0.2-0.3 g / L seaweed extract.

5. The method for high-yield maize cultivation according to claim 1, characterized in that, The base fertilizer mentioned in step two includes well-rotted straw, well-rotted manure and calcium magnesium phosphate fertilizer, with a mass ratio of (4-6):(4-6):(2-4).

6. A method for high-yield maize cultivation according to claim 2 or 5, characterized in that, The decomposed straw is decomposed corn straw, the decomposed manure is decomposed cow manure, the compound fertilizer is 15-15-15 compound fertilizer, and the compound bacterial powder is Bacillus subtilis powder, Bacillus mucilaginosus powder and Trichoderma harzianum powder, with a mass ratio of (2-3):(1-2):(1-2). The calcium magnesium phosphate fertilizer has a P2O5 content ≥15%, a CaO content ≥40%, and a MgO content ≥12%.

7. The method for high-yield maize cultivation according to claim 1, characterized in that, The ammonium polyphosphate P2O5 content in step three is ≥40%.

8. The method for high-yield maize cultivation according to claim 1, characterized in that, The foliar fertilizer for increasing spikelets mentioned in step four, based on water, includes 4-6 g / L urea, 2-4 g / L potassium dihydrogen phosphate, 1-2 g / L zinc sulfate, and 8-12 mg / L brassinolide.

9. A high-yield maize cultivation method according to claim 1, characterized in that, The foliar fertilizer for promoting flowering mentioned in step four, based on water, includes 4-6 g / L potassium nitrate, 0.4-0.6 g / L boric acid, 0.2-0.4 g / L manganese sulfate, and 0.1-0.3 g / L alginic acid.

10. A high-yield maize cultivation method according to claim 1, characterized in that, The foliar fertilizer for increasing weight described in step four, based on water, includes 5-7 g / L potassium dihydrogen phosphate, 1-3 g / L urea, and 0.8-1.2 g / L magnesium sulfate.

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