Summer corn is mostly sown, and it is rarely applied, so it must be topdressed at the right time. Topdressing should be based on nitrogen fertilizer, nitrogen and phosphorus, and appropriate amount of zinc fertilizer. The land with a yield of more than 500 kilograms per mu is 50 kg of ammonium bicarbonate or 20 kg of urea, 10.0-12.5 kg of diammonium phosphate and 1 kg of zinc sulfate. It is necessary to topdress according to soil fertility and soil texture.
1. The soil with high fertility has strong fertility, and the nutrients in the soil can meet the needs of the growth of the corn in the early stage. Generally, the topdressing is mainly carried out in the big bell stage to meet the nutrient needs during the ear differentiation period. Large grains and full of seeds.
2. The loam or sandy loam in the middle and lower fertility is often de-fertilized in the later stage. The topdressing should be applied 30% during the period of the festival (small trumpet period), and 70% or half of the period should be applied during the big bell period. This will not only ensure the normal growth in the early stage, but also ensure sufficient nutrient supply in the later stage to achieve the purpose of increasing production.
3. For sticky soils, there are generally no seedlings and old seedlings, 70% in the jointing stage, 30% in the big bell period, which is good for early development and lays a good foundation for later growth.
1. The soil with high fertility has strong fertility, and the nutrients in the soil can meet the needs of the growth of the corn in the early stage. Generally, the topdressing is mainly carried out in the big bell stage to meet the nutrient needs during the ear differentiation period. Large grains and full of seeds.
2. The loam or sandy loam in the middle and lower fertility is often de-fertilized in the later stage. The topdressing should be applied 30% during the period of the festival (small trumpet period), and 70% or half of the period should be applied during the big bell period. This will not only ensure the normal growth in the early stage, but also ensure sufficient nutrient supply in the later stage to achieve the purpose of increasing production.
3. For sticky soils, there are generally no seedlings and old seedlings, 70% in the jointing stage, 30% in the big bell period, which is good for early development and lays a good foundation for later growth.
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