First, warm and moist spring corn area
1. Fertilization principle. (1) According to the results of soil testing and formula fertilization, determine the appropriate amount of NPK fertilizer. (2) The nitrogenous fertilizer is divided and applied as much as possible, and one-time fertilization is not adopted as much as possible. The proportion and frequency of potash fertilizer application are appropriately increased in high-yield fields. (3) Increase the intensity of straw return, increase organic fertilizer, and increase soil organic matter content. (4) Pay attention to the application of trace elements such as sulfur and zinc. (5) Fertilizer application must be combined with high yield cultivation techniques such as deep loosening and densification. (6) The lower limit of the recommended amount of fertilization scheme is adopted for the middle-high fertility soil.
2. Fertilization recommendations. (1) Recommended 17-17-12 (N-P2O5-K2O) or similar formulations. (2) The output level is 500-600 kg/mu, the recommended dosage of formula fertilizer is 24-29 kg/mu, and the big bell mouth is topdressing urea 14-16 kg/mu. (3) The output level is 600-700 kg/mu, the recommended dosage of formula fertilizer is 29-34 kg/mu, and the big bell mouth is topdressing urea 16-19 kg/mu. (4) The output level is 700 kg/mu or more, the recommended dosage of formula fertilizer is 34-39 kg/mu, and the big bell mouth is topdressed with 19-22 kg/mu of urea. (5) The production level is less than 500 kg/mu, the recommended dosage of formula fertilizer is 20-24 kg/mu, and the big bell mouth is topdressing urea 11-14 kg/mu.
Second, rain and dry for the spring corn area
1. Fertilization principle. (1) Organic-inorganic fertilizers are combined, and organic fertilizers with good rotting and high water content are preferred. (2) To implement the principle of deep fertilizer application, the depth of fertilization should reach 10-20 cm, and the surface of the fertilizer before sowing should be sprinkled with ploughing. (3) Master the principles of balanced fertilization. Zinc-deficient land should pay attention to the use of zinc fertilizer. (4) Apply fertilization according to the characteristics of spring maize for fertilizer, and advocate applying topdressing nitrogen fertilizer.
2. Based on the combination of fertilizer recommendations. (1) Recommended 15-20-10 (N-P2O5-K2O) or similar formulations. (2) The output level is 450-600 kg/mu, the recommended dosage of formula fertilizer is 30-35 kg/mu, and the big bell mouth is topdressing urea 12-16 kg/mu. (3) The output level is 600-700 kg/mu, the recommended dosage of formula fertilizer is 35-40 kg/mu, and the big bell mouth is topdressing urea 16-19 kg/mu. (4) The output level is 700 kg/mu or more, the recommended dosage of formula fertilizer is 40-45 kg/mu, and the big bell mouth is topdressing urea 19-22 kg/mu. (5) The output level is less than 450 kg/mu, the recommended dosage of formula fertilizer is 20-25 kg/mu, and the big bell mouth is topdressed with 10-12 kg/mu urea.
3. One-time fertilization advice. (1) 26-13-6 (N-P2O5-K2O) or similar formulations are recommended. (2) The output level is 450-600 kg/mu, and the recommended dosage of formula fertilizer is 45-50 kg/mu, which is used as a base fertilizer or a one-time application of seed dressing. (3) Production level 600-700 kg/mu, 20%-40% of controlled-release nitrogen fertilizer with release period of 50-60 days, and 50-55 kg/mu of recommended dosage of formula fertilizer as base fertilizer or top-dressing fertilizer Sexual application. (4) The output level is 700 kg/mu or more, there can be 20%-40% slow-release nitrogen release at 50-60 days, and the formula fertilizer is 55-60 kg/mu, which is used as base fertilizer or fertilizer at the seedling stage. Sexual application. (5) The output level is below 450 kg/mu, and the recommended dosage of formula fertilizer is 30-40 kg/mu, which is used as a base fertilizer or one-time application of seed dressing.
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