1. Requirements of Fertilizer: Nitrogen is absorbed most during the whole growth period of maize, followed by potassium, and less phosphorus. The absorption of nitrogen, before heading and fertilization, has absorbed 85% of the total nitrogen. For the absorption of phosphorus, 70% has been absorbed before heading. For the absorption of potassium, more than 70% has been absorbed before heading, and 30% is absorbed during heading fertilization. Therefore, potassium is generally applied in the early period of fertility. The use of straw to return to the field as a corn basal fertilizer has a good effect. In the soil with low soil fertility, a small amount of nitrogen fertilizer should be used in the application of straw to regulate the ratio of carbon to nitrogen and accelerate the decomposition of straw.

2. Fertilization technology: The fertilization rate for the whole growth cycle of spring corn in the medium fertility level is 1500-2000 kg of farmyard fertilizer (or 250-300 kg of commercial organic fertilizer), 15-17 kg of nitrogen fertilizer, 4-5 kg ​​of phosphate fertilizer, and potassium fertilizer 8- 9 kg. Nitrogen fertilizer, potassium fertilizer sub-basal fertilizer and two top-dressing fertilizers, and all phosphorus fertilizers were used as base fertilizer, fertilizer and farmyard fertilizer (or commercial organic fertilizer). Base fertilizer: Mushi farmyard fertilizer 1500-2000 kg or commodity organic fertilizer 250-300 kg, urea 5-6 kg, 9-11 kg of ammonium phosphate, potassium chloride 5 kg, zinc deficiency soil can be Mushi 1-2 kg sulfuric acid Zinc. It is recommended to use long-acting fertilizers, and encourage the straw to return to fertility. Top dressing: Small bell-mouth dressing: Mushi urea 14-15 kg, potassium chloride 7-8 kg. Big bell-mouth dressing: Mushi urea 8-9 kg, potassium chloride 4-5 kg. Root dressing: Base fertilizer without zinc, zinc seed can be soaked with 0.02-0.05% zinc sulfate solution to treat seeds for 12-24 hours, seed dressing for every 1kg seeds diluted with 2-3g zinc sulfate plus a small amount of water and mixed with seeds Uniform, foliar spray can be sprayed with 0.05-0.1% zinc sulfate solution at seedling or jointing stage. The boron deficiency can be soaked in boron fertilizer and soaked in 0.01-0.05% boric acid solution for 12-24 hours.

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