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(2) Topdressing: Topdressing is generally carried out by secondary topdressing. The first time is to raise the seedling fertilizer. The period is “small trumpet period. The quick-acting fertilizer ammonium bicarbonate is used, 30-50 kg per mu, and it can be combined with cultivating. Weeding and cultivating soil, the fertilizer is covered with soil after application. The second top dressing is the attacking panicle fertilizer, taking the attack of the pole and the attack (the key to corn fertilization), and selecting urea as the top dressing. The application period is “big bell mouth periodâ€, generally per mu. Application of urea 30 ~ 50 kg, combined with cultivating and weeding soil application, urea after application, covered with soil, the specific method can be used deep drilling, for some zinc, iron, boron and other trace elements of arable land, spraying at the early jointing stage 0.3 The % ferrous sulfate ferrous or 0.2% borax solution has a significant yield increase effect.
Hua County: Yue Xiuli
Fertilization principle of corn
(1) Base fertilizer: The base fertilizer is mainly composed of decomposed organic fertilizer, generally applying 1500-3000 kg of decomposed organic fertilizer per acre. According to the soil measurement, the phosphorus-deficient soil is applied with potassium phosphate 30-40 kg per mu, and the potassium-deficient soil is applied with potassium chloride or potassium sulfate 5-10 kg per mu. In the base fertilizer, the late-effect fertilizer accounts for about 80% of the total amount of base fertilizer, and the quick-acting fertilizer accounts for about 20%. The base fertilizer can be applied in full depth. If the amount of fertilizer is small, the method of ditch application or hole application can be used.
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