I. Effect of Fertilization on Yielding Summer corn is a crop that requires more nitrogen. Under normal circumstances, nitrogen application can increase yield by about 30%. However, as the input of nitrogen fertilizer increases, the supply of soil nutrients is out of balance, and it is necessary to balance fertilization in order to capture high yield of corn. Nitrogen and phosphorus combined with summer maize increased yield by about 47%; nitrogen, phosphorus and potassium combined with summer maize increased yield by more than 60%. Second, the scientific fertilization formula summer maize yield does not increase proportionally with the increase of fertilizer application, more than a certain amount, the greater the amount of fertilizer application, the lower the yield. A field trial is required to determine an economically sound fertilization formula. (1) The local production formula is based on the summer maize yield in the non-fertilization area. The ground power is divided into three levels: that is, the yield of summer corn per hectare is less than 3750 kg for low-yield fields; 3750-5250 kg for middle-yield fields; and high yield for more than 5250 kg. field. Low-yield fields require 256-224 kg of pure nitrogen per hectare, 120-150 kg of phosphorus pentoxide, and 0-75 kg of potassium oxide. The middle-yield field requires 180-225 kg of pure nitrogen per hectare, 105-120 kg of phosphorus pentoxide, and 75-105 kg of potassium oxide. High-yield fields require 180-195 kg of pure nitrogen per hectare, 105 kg of phosphorus pentoxide, and 105-135 kg of potassium oxide. (2) Soil testing and fertilization formula Determine the cost-effective fertilization formula by measuring soil nutrients. Soil alkaline nitrogen is less than 50 mg kg, fast-acting phosphorus is less than 15 mg/kg, and available potassium is lower than 80 mg/kg for low-yield fields; soil alkaline nitrogen is 60-110 mg/kg, and available phosphorus is 15-30 mg/kg. The available potassium is 80-120 mg/kg for middle-yielding fields; the soil alkalinity exceeds 110 mg/kg, the available phosphorus exceeds 30 mg/kg, and the available potassium exceeds 120 mg/kg for high-yield fields. Low-yield fields: The target yield requires 165-200 kg of pure nitrogen per hectare, 105-120 kg of phosphorus pentoxide, and 90-120 kg of potassium nitride. The middle-field is required to apply 165-175 kg of pure nitrogen per hectare, 80-90 kg of phosphorus pentoxide, and 90 kg of potassium oxide. High-yield fields require about 120 kg of pure nitrogen per hectare, 15-20 kg of phosphorus pentoxide, and 30-90 kg of potassium oxide. Third, the appropriate fertilization period and method (1) to apply the base fertilizer. In the fertilization formula, phosphorus and potassium fertilizers are used as the base fertilizer; 60% of the nitrogen fertilizer is used as the base fertilizer. For the soil with poor water retention and fertilizer retention, it is mainly used for top dressing. The base fertilizer should be evenly spread on the surface and turned into 20 cm deep soil. (2) skillfully apply fertilizer. From the fertilization formula, 15-22.5 kilograms of pure nitrogen, 45 kilograms of phosphorus pentoxide, and 15-22.5 kilograms of potassium oxide are used as seed fertilizers. It is strictly forbidden to contact with seeds to lay the foundation for cultivating strong seedlings. (3) Use good topdressing. The top dressing is mainly nitrogen fertilizer. If there is no phosphorus or potassium fertilizer in the base fertilizer, it can be chased early. Topdressing is divided into three types: seedling fertilizer, jointing fertilizer, and attacking fertilizer. The seedlings should be light, ensuring the seedlings and the seedlings. Jointing fertilizer refers to the top dressing from the period of corn jointing to small bell mouth, which generally accounts for 40% of the amount of topdressing. The attacking and tapping fertilizer refers to the fertilizer applied in the corn flare period, which generally accounts for 60% of the topdressing amount. The method of top dressing can be applied, or it can be applied at a point. The depth of fertilization is about 15 cm, and it should be covered in time after application. (4) Use the root dressing. Top dressing is an auxiliary emergency measure. This method is often used when symptoms of deficiency occur or when root function declines. Foliar spraying was carried out on a sunny day at 4 pm with a 1% urea solution or a 0.08%-0.1% potassium dihydrogen phosphate solution. 4. Reasonable application of micro-fertilizers with trace elements deficiency. The dosage of zinc, boron and manganese fertilizers is 10 kg, 7 kg and 20 kg per hectare. When applied, mix an appropriate amount of fine soil, spread it evenly on the surface, and plow it into the soil. When seeding fertilizer, it can be soaked in 0.01%-0.05% solution for 12-24 hours, and then dried to be sown. 0.1%-0.2% solution can also be used as top dressing, 900 kg per hectare, spray twice, with a time interval of about 15 days. Soy Sauce,Soy Sauce For Resturant,Raw Sauce Soy Sauce,Soy Sauce Seasonings Chinese Seasoning (Shandong) Trading Co.,Ltd , https://www.zt-trading.com The amount of fertilizer required for summer maize seedlings is small, and the amount of fertilizer is large at the earing stage to the flowering stage, and then gradually decreases.
