Under-mulch drip irrigation disposable dressing-free controlled release fertilizer special for corn

Abstract

The invention belongs to the technical field of fertilizers, and particularly relates to an under-mulch drip irrigation disposable dressing-free controlled release fertilizer special for corn, which comprises the following raw materials: polyurethane coated urea, an acidic phosphate fertilizer, a granular potash fertilizer, a quick-acting nitrogen fertilizer and the like. The special controlled-release fertilizer for the corn is specially designed for an under-film drip irrigation technology, achieves the purpose of one-time fertilization, effectively reduces the investment of high-cost water-soluble fertilizer in the later period, reduces the risk that water and fertilizer impurities possibly block drip holes, reduces the difficulty of fertilization operation, reduces saline-alkali stress of soil on crops and nutrient loss, saves cost, improves efficiency, increases production and income, and is suitable for large-scale popularization and application. The method has high economic value and is suitable for large-area application and popularization.

Description

Technical Field

[0001] The invention belongs to the field of fertilizers, and specifically relates to a controlled-release fertilizer for corn, and in particular to a disposable controlled-release fertilizer for corn that does not require topdressing and is drip-irrigated under film. Background Art

[0002] Due to the special geological conditions in the Northwest region, strong sunlight, large temperature difference between day and night, drought and little rain, the average annual precipitation is 230 mm, the evaporation is about 1840-2300 mm, the soil evaporation intensity is high, water resources are scarce, climate warming, less precipitation, increased wind speed, soil wind erosion, water evaporation and other factors, vegetation reduction, land productivity decline, serious desertification, reduction in effective cultivated land area, low land resource utilization rate, and an increasingly severe trend. The land resource structure has become a major factor related to food security and poses a great threat to food production and security.

[0003] The development of sub-film drip irrigation technology has greatly improved the utilization rate of land, especially the utilization rate of land for corn planting in the northwest region. Through reasonable dense planting and agronomic measures of film-covered cultivation, weeding is effectively removed, inter-plant evaporation is reduced, and ground temperature is increased. At the same time, corn fertilization and irrigation are synchronized, and nutrients are continuously and evenly and effectively transported to the roots and the vicinity of the root system with water. With the continuous growth of crops, the nutrient demand changes greatly. By adjusting the nutrient content for root absorption and meeting the nutrient needs of crops, the water and fertilizer utilization rate is effectively improved, thereby effectively improving the quality and yield of corn. Although sub-film drip irrigation technology has many advantages, its dripper orifice is small, the water flow rate is set low, the irrigation water quality requirements are high, and the clogging problem is serious, resulting in the need for the required topdressing to be a fully water-soluble expensive fertilizer, and the drip irrigation device needs to be equipped with a filter device, which forces the effective nutrients to be filtered with the filter device, and the per-acre investment cost is high. In view of the nutrient demand of corn during growth, fertilizer is applied 2 to 4 times on average, and the number of topdressing times is high, the operation is difficult, and it is time-consuming and labor-intensive.

[0004] The Chinese invention patent application with application number CN 106385926 B is disclosed, and the present invention relates to a one-time fertilization method for summer corn suitable for the Huanghuai Plain. The method is operated on a plot of wheat harvested under the wheat-corn rotation system in the Huanghuai Plain, using a corn sowing and fertilizing machine with a strip rotary tiller to apply nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer and zinc sulfate, sowing and fertilizing once, and no topdressing is performed later; the controlled-release nitrogen fertilizer mentioned in the method is composed of a slow-release fertilizer with additives such as urease inhibitors and nitrogen fertilizer inhibitors, or sulfur-coated urea, metal oxides or metal salts coated urea or fertilizer-coated fertilizer, and the overall nutrient release period is ≥60 days. The controlled-release nitrogen fertilizer is significantly different from the polyurethane controlled-release nitrogen fertilizer in terms of release mechanism, and the nutrient release is uneven, and it is easily affected by saline-alkali and other environmental factors. Moreover, the area of ​​use is the Huanghuai Plain, and it is difficult to meet the nutrient supply of corn during drip irrigation under film in the northwest region. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a one-time controlled-release fertilizer for corn without topdressing under film drip irrigation. The purpose is to use a controlled-release fertilizer for corn, based on the drip irrigation technology under film, to match the nutrient demand of corn, and to design a one-time controlled-release fertilizer for corn without topdressing under film drip irrigation, so as to achieve the purpose of one-time fertilization, effectively reduce the input of high-cost water-soluble fertilizers in the later stage, reduce the risk of water and fertilizer impurities blocking the drip holes, reduce the difficulty of fertilization operation, and reduce the salinity and alkali stress of the soil on crops and nutrient loss.

[0006] In a first aspect, the present invention provides a one-time, topdressing-free, controlled-release fertilizer for corn using sub-membrane drip irrigation, wherein the raw materials of the controlled-release fertilizer for corn include polyurethane-coated urea and acidic granular phosphate fertilizer.

[0007] Furthermore, the polyurethane coated urea includes coated urea A and coated urea B, wherein the release period of coated urea A is 60-70 days, and the release period of coated urea B is 90-100 days.

[0008] Further preferably, the release period of the coated urea A is 60 days, and the release period of the coated urea B is 100 days.

[0009] Furthermore, the mass ratio of the coated urea A to the coated urea B is 1:0.8-1.2.

[0010] Further preferably, the mass ratio of the coated urea A to the coated urea B is 1:1.

[0011] Furthermore, the acidic granular phosphate fertilizer in the controlled-release fertilizer specifically for corn includes superphosphate or monoammonium phosphate granules, or superphosphate and monoammonium phosphate granules.

[0012] Furthermore, in the controlled-release fertilizer for corn, the polyurethane-coated urea accounts for 20-40wt%, the heavy superphosphate accounts for 0-40wt%, and the monoammonium phosphate accounts for 0-45wt%, wherein the proportions of heavy superphosphate and monoammonium phosphate are not 0wt% at the same time.

[0013] Furthermore, the controlled-release fertilizer for corn also includes quick-acting granular nitrogen fertilizer, such as large-granular urea or ammonium sulfate granules, or large-granular urea and ammonium sulfate granules.

[0014] Furthermore, the quick-acting granular nitrogen fertilizer accounts for 5-30%; more preferably, the proportion is 10-30%.

[0015] Furthermore, the controlled-release fertilizer for corn includes granular potassium fertilizer, and the granular potassium fertilizer is selected from granular potassium sulfate, granular potassium chloride, or a combination of granular potassium sulfate and potassium chloride.

[0016] Furthermore, the proportion of the granular potash fertilizer is 8-20wt%.

[0017] Furthermore, the controlled-release fertilizer for corn includes 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0-38wt% of heavy superphosphate, 0-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, and 8wt%-20wt% of granular potash fertilizer.

[0018] Furthermore, the special controlled-release fertilizer for corn includes sulfur bentonite particles.

[0019] Further preferably, the sulfur bentonite particles account for 0-5wt% in the controlled-release fertilizer for corn.

[0020] Further preferably, the special controlled-release fertilizer for corn includes 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0-38wt% of double superphosphate, 0-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, 8wt%-20wt% of granular potash fertilizer, and 0.5wt%-4wt% of sulfur bentonite granules.

[0021] Furthermore, the controlled-release fertilizer specifically for corn includes boron particles or zinc particles, or a combination of boron particles and zinc particles.

[0022] Further preferably, the sum of the proportions of the boron particles and the zinc particles in the controlled-release fertilizer for corn is 0-4wt%.

[0023] Further preferably, the controlled-release fertilizer specifically for corn includes 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0-38wt% of double superphosphate, 0-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, 8wt%-20wt% of granular potash fertilizer, 0.1wt%-1wt% of boron granules, and 0.1wt%-1wt% of zinc granules.

[0024] Furthermore, the disposable controlled-release fertilizer for corn under film drip irrigation, NP 2 O 5 -K 2 O content is 25-16-6 or 26-15-6 or 24-17-8. NP 2 O 5 -K 2 O content refers to the nutrient content of nitrogen, phosphorus and potassium in controlled-release fertilizers, recorded in wt%.

[0025] In a second aspect, the present invention provides a one-time controlled-release fertilizer for corn that does not require topdressing for drip irrigation under film. The controlled-release fertilizer for corn is used as a base fertilizer for corn drip irrigation under film, with an application rate of 60 to 120 kg per mu, and is applied once.

[0026] Further preferably, the application amount per mu is 80-100 kg, applied all at once, without topdressing in the later stage, and watering is done 10-15 times.

[0027] The present invention has the following beneficial effects:

[0028] 1. The present invention provides a one-time controlled-release fertilizer for corn without topdressing under film drip irrigation. It is mixed with polyurethane coated urea and acidic granular phosphate fertilizer, and the release period of polyurethane coated urea is adjusted. The coated urea A has a release period of 60-70 days and the coated urea B has a release period of 90-100 days. The polyurethane coated urea formula is combined with the sub-film drip irrigation technology to effectively meet the nitrogen nutrient requirements of corn in the jointing stage and the large bell mouth stage. It is a one-time fertilization and no topdressing is required in the later stage. It overcomes the defect of topdressing water-soluble fertilizer during sub-film drip irrigation, significantly reduces the planting cost, and avoids the problem of drip irrigation nozzle blockage caused by topdressing water-soluble fertilizer through drip irrigation.

[0029] 2. The present invention provides a disposable controlled-release fertilizer for corn that does not require topdressing under film drip irrigation. The acidic granular phosphate fertilizer includes one of heavy superphosphate granules or monoammonium phosphate granules or a combination of the two. Since the soil in the northwest region is alkaline, plant roots need to secrete more organic acids to capture phosphate fertilizers and trace elements. The phosphate fertilizer granules have an acidic pH and high water solubility, which can effectively adjust the soil pH, enhance the mobility of phosphate fertilizers, and make the phosphate fertilizers more effectively enriched near the corn roots, thereby meeting the phosphorus nutrient requirements of corn.

[0030] 3. A disposable controlled-release fertilizer for corn under film drip irrigation provided by the present invention can improve saline-alkali land by adding sulfur bentonite, and by optimizing granular nitrogen fertilizer and phosphate fertilizer, applying coated urea with different release periods, and using quick-acting granular nitrogen fertilizer and acidic granular phosphate fertilizer, effectively ensuring the nitrogen and phosphorus supply of corn fertilizer under film drip irrigation, and additionally applying potassium sulfate, potassium chloride, boron granules, zinc granules, and sulfur fertilizer, effectively reducing pH, promoting crops to absorb nutrients more comprehensively, enhancing plant resistance, reducing the stress of saline-alkali land under film drip irrigation in the northwest region, and improving the effectiveness of phosphorus, which can be widely used in saline-alkali arid land in the northwest region, and improving the utilization rate of idle land. Under the water control conditions of drip irrigation, it is more conducive to exerting the stability of the release of slow-release coated urea, effectively releasing nitrogen nutrients during the two fertilizer peak periods of corn, reducing ammonia volatilization in saline-alkali land, and improving fertilizer utilization.

[0031] In summary, the disposable controlled-release fertilizer for corn without topdressing for sub-membrane drip irrigation of the present invention is reliable and practical, and is effectively integrated with the sub-membrane drip irrigation technology in the northwest region. It releases nutrients evenly, reduces saline-alkali stress, and avoids pipe blockage caused by water quality and fertilizer. It is easy to operate, has low maintenance and use costs, increases corn production and income, and has high economic and social value for land development under desert conditions, and is suitable for large-scale promotion and application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical scheme of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0033] The release period of coated urea A used in the embodiment of the present invention is 60 days, and the release period of coated urea B is 100 days. Other raw materials are conventionally available in the market.

[0034] Example 1

[0035] Coated urea A 12wt%, coated urea B 12wt%, superphosphate granules 34.8wt%, large granular urea 29.7wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 10.6%.

[0036] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0037] Example 2

[0038] Coated urea A 14wt%, coated urea B 14wt%, superphosphate granules 34.8wt%, large granular urea 25.7wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 12.4%.

[0039] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0040] Example 3

[0041] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0042] Coated urea A 16wt%, coated urea B 16wt%, superphosphate granules 34.8wt%, large granular urea 21.7wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 14.2%.

[0043] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0044] Example 4

[0045] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0046] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 34.8wt%, large granular urea 17.7wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 16.0%.

[0047] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0048] Example 5

[0049] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0050] Coated urea A 20wt%, coated urea B 20wt%, superphosphate granules 34.8wt%, large granular urea 13.7wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 17.8%.

[0051] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0052] Example 6

[0053] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0054] Coated urea A 18wt%, coated urea B 18wt%, monoammonium phosphate granules 36.75wt%, large granular urea 9.1wt%, granular potassium sulfate 12.0wt%, granular ammonium sulfate 6.15%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 16.0%.

[0055] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0056] Example 7

[0057] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0058] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 23.0wt%, monoammonium phosphate granules 12.3wt%, large granular urea 17.1wt%, granular potassium sulfate 11.6wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 16.0%.

[0059] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0060] Example 8

[0061] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0062] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 23.0wt%, monoammonium phosphate granules 12.3wt%, large urea granules 16.4wt%, granular potassium sulfate 11.6wt%, zinc sulfate monohydrate 0.35wt%, granular boron 0.35wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 16.0%.

[0063] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0064] Example 9

[0065] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0066] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 20.0wt%, monoammonium phosphate granules 15.5wt%, large granular urea 15.2wt%, granular potassium sulfate 11.6wt%, zinc sulfate monohydrate 0.35wt%, granular boron 0.35wt%, sulfur bentonite granules 1wt%. NP 2 O 5 -K 2 O nutrient content is 25-16-6, and the nitrogen control ratio is 16%.

[0067] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0068] Example 10

[0069] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0070] Coated urea A 18.0wt%, coated urea B 18.0wt%, superphosphate granules 32.7wt%, large granular urea 19.8wt%, granular potassium sulfate 11.5wt%. NP 2 O 5 -K 2 O nutrient content is 26-15-6, and the nitrogen control ratio is 16%.

[0071] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0072] Embodiment 11

[0073] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0074] Coated urea A 18wt%, coated urea B 18wt%, monoammonium phosphate granules 34.3wt%, large urea granules 9.0wt%, granular potassium sulfate 12.0wt%, granular ammonium sulfate 8.7wt%. NP 2 O 5 -K 2 O nutrient content is 26-15-6, and the nitrogen control ratio is 14.5%.

[0075] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0076] Example 12

[0077] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0078] Coated urea A 18.0wt%, coated urea B 18.0wt%, superphosphate granules 20.0wt%, monoammonium phosphate granules 13.0wt%, large granular urea 17.6wt%, granular potassium sulfate 11.6wt%, granular ammonium sulfate 1.8wt%. NP 2 O 5 -K 2 O nutrient content is 26-15-6, and the nitrogen control ratio is 16.0%.

[0079] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0080] Embodiment 13

[0081] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0082] Coated urea A 18.0wt%, coated urea B 18.0wt%, superphosphate granules 23.0wt%, monoammonium phosphate granules 10.3wt%, large granular urea 18.4wt%, granular potassium sulfate 11.6wt%, zinc sulfate monohydrate 0.35wt%, granular boron 0.35wt%. NP 2 O 5 -K 2 O nutrient content is 26-15-6, and the nitrogen control ratio is 16.0%.

[0083] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0084] Embodiment 14

[0085] This embodiment provides a one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation, the formula of which is:

[0086] Coated urea A 18wt%, coated urea B 18wt%, monoammonium phosphate granules 39wt%, large urea granules 5.6wt%, granular potassium chloride 13.4wt%, granular ammonium sulfate 6.0wt%. NP 2 O 5 -K 2 O nutrient content is 24-17-8, and the nitrogen control ratio is 16.0%.

[0087] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0088] Embodiment 15

[0089] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 20wt%, monoammonium phosphate granules 18wt%, large granular urea 12.6wt%, granular potassium chloride 13.4wt%. NP 2 O 5 -K 2 O nutrient content is 24-17-8, and the nitrogen control ratio is 16.0%.

[0090] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0091] Example 16

[0092] Coated urea A 18wt%, coated urea B 18wt%, superphosphate granules 17.2wt%, monoammonium phosphate granules 20.4wt%, large granular urea 12.3wt%, granular potassium chloride 13.4wt%, zinc sulfate monohydrate 0.35wt%, granular boron 0.35wt%. NP 2 O 5 -K 2 O nutrient content is 24-17-8, and the nitrogen control ratio is 16.0%.

[0093] On the other hand, the present embodiment provides an application method of the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation, specifically, using the above-mentioned one-time controlled-release fertilizer for corn that does not require top dressing by sub-film drip irrigation as the base fertilizer for corn sub-film drip irrigation, with an application rate of 80 kg per mu, applied at one time, and dripping 15 times in the whole cycle.

[0094] Field trial 1:

[0095] 1. Planting conditions

[0096] (1) Corn variety: Xianyu 1731

[0097] (2) Planting site and soil conditions: Sunan Yugu Autonomous County, the area is desert sandy soil, belonging to the desert wind sand soil subtype desert quicksand soil. The annual average temperature is 8℃, the annual precipitation is 87mm, the frost-free period is about 145 days, and the soil nutrients are: organic matter 0.43%, N: 0.029%, P 2 O 5 : 0.042%, K 2 O: 1.7%, available potassium 115ppm, pH: 8.5.

[0098] (3) Planting area: 6 mu.

[0099] 2. Fertilization method:

[0100] Conventional fertilization: 14 kg urea, 28 kg 64% diammonium phosphate, and 16 kg potassium sulfate as base fertilizer. Water is dripped 15 times in the whole cycle, including 4 times of fertilizer dripping with water in the middle and late stages of corn growth. Each time, 15 catties of urea is dripped. 5 catties of potassium sulfate fertilizer is added for the first and third times of fertilizer dripping.

[0101] Test product formula: Example 1, Example 2, Example 3, Example 4, Example 5.

[0102] A one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation is compared with conventional fertilizer application methods. The specific comparison content is shown in Table 1 below.

[0103] Table 1

[0104]

[0105] As can be seen from Table 1, compared with conventional fertilization methods, in the present invention, the one-time controlled-release fertilizer for corn without topdressing by drip irrigation under the membrane is invented. The number of fertilization is reduced from 6 times to 1 time, and no topdressing is required in the later stage, and the amount of fertilizer is reduced by 13.9%. The yield is increased by 48-77 kg / mu, the yield is increased by 5.3%-8.4%, and the income is increased by 96-154 yuan / mu. The effective phosphorus is increased and the pH value is reduced, which can effectively increase the income and reduce the number of fertilization and the investment in facility agriculture. Field test 2:

[0106] 1. Planting conditions

[0107] (1) Corn variety: Xianyu 1731

[0108] (2) Planting site and soil conditions: Sunan Yugu Autonomous County, the area is desert sandy soil, belonging to the desert wind sand soil subtype desert quicksand soil. The annual average temperature is 8℃, the annual precipitation is 87mm, the frost-free period is about 145 days, and the soil nutrients are: organic matter 0.43%, N: 0.017%, P 2 O 5 : 0.051%, K 2 O: 1.7%, available potassium 115ppm, pH: 8.5.

[0109] (3) Planting area: 5 mu.

[0110] 2. Fertilization method:

[0111] Conventional fertilization: 14 kg urea, 28 kg 64% diammonium phosphate, and 16 kg potassium sulfate as base fertilizer. Water is dripped 15 times in the whole cycle, including 4 times of fertilizer dripping with water in the middle and late stages of corn growth. Each time, 15 catties of urea is dripped. 5 catties of potassium sulfate fertilizer is added for the first and third times of fertilizer dripping.

[0112] Test product formula: Example 6, Example 7, Example 8, Example 9.

[0113] A one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation is compared with conventional fertilizer application methods. The specific comparison content is shown in Table 2 below.

[0114] Table 2

[0115]

[0116] As can be seen from Table 2, compared with the conventional fertilization method, in Example 6, Example 7, Example 8, and Example 9 of the present invention, the one-time free-topdressing corn-specific controlled-release fertilizer for sub-membrane drip irrigation is invented, and the number of fertilization is reduced from 6 times to 1 time, and no topdressing is required in the later period, and the amount of fertilizer is reduced by 13.9%. The yield is increased by 63-84 kg / mu, the yield is increased by 6.9%-9.2%, and the income is increased by 126-168 yuan / mu. The effective phosphorus is increased and the pH value is reduced, which can effectively increase income and reduce the number of fertilizations and the investment in facility agriculture.

[0117] Field trial 3:

[0118] This embodiment provides a one-time controlled-release fertilizer for corn without topdressing under film drip irrigation, and the specific implementation steps are as follows:

[0119] 1. Planting conditions

[0120] (1) Corn variety: Xianyu 1731

[0121] (2) Planting site and soil conditions: Sunan Yugu Autonomous County, the area is desert sandy soil, belonging to the desert wind sand soil subtype desert quicksand soil. The annual average temperature is 8℃, the annual precipitation is 87mm, the frost-free period is about 145 days, and the soil nutrients are: organic matter 0.43%, N: 0.017%, P 2 O 5 : 0.051%, K 2 O: 1.7%, available potassium 115ppm, pH: 8.5.

[0122] (3) Planting area: 5 mu.

[0123] 2. Fertilization method:

[0124] Conventional fertilization: 14 kg urea, 28 kg 64% diammonium phosphate, and 16 kg potassium sulfate as base fertilizer. Water is dripped 15 times in the whole cycle, including 4 times of fertilizer dripping with water in the middle and late stages of corn growth. Each time, 15 catties of urea is dripped. 5 catties of potassium sulfate fertilizer is added for the first and third times of fertilizer dripping.

[0125] Test product formula: Example 10, Example 11, Example 12, Example 13.

[0126] A one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation is compared with conventional fertilizer application methods. The specific comparison content is shown in Table 3 below.

[0127] Table 3

[0128]

[0129] As can be seen from Table 3, compared with the conventional fertilization method, in Example 10, Example 11, Example 12, and Example 13 of the present invention, the one-time free-topdressing corn-specific controlled-release fertilizer for sub-membrane drip irrigation is invented, and the number of fertilization is reduced from 6 times to 1 time, and no topdressing is required in the later period, and the amount of fertilizer is reduced by 13.9%. The yield is increased by 58-77 kg / mu, the yield is increased by 6.4%-8.4%, and the income is increased by 116-154 yuan / mu. The effective phosphorus is increased and the pH value is reduced, which can effectively increase income and reduce the number of fertilizations and facility agriculture investment.

[0130] Field trial 4:

[0131] This embodiment provides a one-time controlled-release fertilizer for corn without topdressing under film drip irrigation, and the specific implementation steps are as follows:

[0132] 1. Planting conditions

[0133] (1) Corn variety: Denghai 605

[0134] (2) Planting site and soil conditions: Taichuan Township, Yongdeng County, Lanzhou City, Gansu Province, with an altitude of 2106m. The parent material is alluvial loess. The annual average temperature is 5.6℃, the annual precipitation is 275mm, and the frost-free period is 125 days. The organic matter content is 1.31%, the total nitrogen is 0.19%, and the P 2 O 5 : 0.06%, K 2 O: 1.45%, pH: 8.1.

[0135] (3) Planting area: 4 mu.

[0136] 2. Fertilization method:

[0137] 12 kg urea, 28 kg 64% diammonium phosphate and 15 kg potassium chloride are used as base fertilizers. Water is dripped 15 times in the whole cycle, including 4 times of fertilizer dripping with water in the middle and late stages of corn growth. 15 catties of urea is dripped each time, and 5 catties of potassium sulfate fertilizer is added for the first and third times of fertilizer dripping.

[0138] Test product formula: Example 14, Example 15, Example 16.

[0139] A one-time, topdressing-free, controlled-release fertilizer for corn under film drip irrigation is compared with conventional fertilizer application methods. The specific comparison content is shown in Table 4 below.

[0140] Table 4

[0141]

[0142] As can be seen from Table 4, compared with the conventional fertilization method, in Example 14, Example 15, and Example 16 of the present invention, the one-time free-topdressing corn-specific controlled-release fertilizer for sub-membrane drip irrigation is invented, and the number of fertilizations is reduced from 6 times to 1 time, and no topdressing is required in the later period, and the amount of fertilizer is reduced by 11.1%. The yield is increased by 73-111 kg / mu, the yield is increased by 9.8%-14.9%, the income is increased by 146-222 yuan / mu, the effective phosphorus is increased, and the pH value is reduced, which can effectively increase income and reduce the number of fertilizations and facility agriculture investment.

Claims

1. A disposable controlled-release fertilizer for corn under film drip irrigation, the main feature of which is that the controlled-release fertilizer for corn includes polyurethane-coated urea and acidic granular phosphate fertilizer.

2. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 1, characterized in that: The polyurethane coated urea comprises coated urea A and coated urea B. The release period of coated urea A is 60-70 days, and the release period of coated urea B is 90-100 days.

3. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 2, characterized in that: The mass ratio of the coated urea A to the coated urea B is 1:0.8-1.

2.

4. A disposable controlled-release fertilizer for corn for drip irrigation under film according to any one of claims 1 to 3, characterized in that: The acidic granular phosphate fertilizer in the controlled-release fertilizer specifically for corn includes superphosphate or monoammonium phosphate granules, or a combination of superphosphate and monoammonium phosphate granules.

5. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 4, characterized in that: The polyurethane coated urea in the controlled-release fertilizer for corn accounts for 20-40wt%, the superphosphate accounts for 0-40wt%, and the monoammonium phosphate accounts for 0-45wt%, wherein the superphosphate and the monoammonium phosphate do not account for 0wt% at the same time.

6. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 5, characterized in that: The controlled-release fertilizer for corn also includes a quick-acting granular nitrogen fertilizer selected from large-granular urea or ammonium sulfate granules, or a combination of large-granular urea and ammonium sulfate granules.

7. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 6, characterized in that: The controlled-release fertilizer for corn includes granular potassium fertilizer, which is selected from granular potassium sulfate or granular potassium chloride, or a combination of granular potassium sulfate and potassium chloride.

8. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 7, characterized in that: The special controlled-release fertilizer for corn comprises, by mass percentage, 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0-38wt% of heavy superphosphate, 0-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, and 8wt%-20wt% of granular potash fertilizer.

9. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 7, characterized in that: The controlled-release fertilizer specifically for corn comprises boron particles or zinc particles, or a combination of boron particles and zinc particles.

10. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 9, characterized in that: The special controlled-release fertilizer for corn comprises, by mass percentage, 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0wt%-38wt% of heavy superphosphate, 0-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, 8wt%-20wt% of granular potash fertilizer, 0wt%-2wt% of boron granules, and 0wt%-2wt% of zinc granules.

11. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 7, characterized in that: The special controlled-release fertilizer for corn includes sulfur bentonite particles.

12. The disposable controlled-release fertilizer for corn under film drip irrigation according to claim 11, characterized in that: The special controlled-release fertilizer for corn comprises, by mass percentage, 10wt%-20wt% of coated urea A, 10wt%-20wt% of coated urea B, 0wt%-38wt% of heavy superphosphate, 0wt%-40wt% of monoammonium phosphate, 5wt%-30wt% of quick-acting nitrogen fertilizer, 8wt%-20wt% of granular potash fertilizer, and 0.5wt%-5wt% of sulfur bentonite granules.

13. The use of a disposable controlled-release fertilizer for corn under film drip irrigation according to any one of claims 1 to 12, characterized in that: As base fertilizer for corn drip irrigation under film, the application rate is 60 to 120 kg per mu, applied in one time.

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