Generally, one-time fertilization is not advocated. It is feared that the application of nitrogen fertilizer will cause long-term and long-term de-fertilization. But if there are mechanized sowing and fertilizing conditions. For corn, the high-nitrogen ternary compound fertilizer can be applied to the soil layer at different depths below the seed side at 40~60 kg per acre, about 1/4 in the shallow layer and 3/4 in the deep layer, so that the crop is in the Sufficient nutrients are available at the seedling stage and in the middle and late stages. If the fertilizer used is slow-release, and it is better to see if the crop has signs of de-fertilization in the middle and late stages. For soybeans, 30-40 kg of low-nitrogen or general-purpose (skinny) compound fertilizer can be applied to the soil layer of 10 cm or more in one time, of which shallow layer accounts for about 1/3, and deep layer accounts for about 2/ 3. If there are signs of deferration in the later stage, apply appropriate amount of urea or spray foliar fertilizer. Heilongjiang Farm has had successful experience in this. (Wang Xingren)
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