Apply high-nitrogen compound fertilizer to prevent burning

Zhang Bojin, a corn-growing farmer in Siping, Jilin, planted a hatchback cornfield at the end of April this year. In order to apply spring fertilizer to spring corn, he chose two kinds of compound fertilizers, one is 48% (16%-16%-16%) of high-nitrogen compound fertilizer, 27 kg per mu, and the other content is 29%- 9%-13% of high-nitrogen compound fertilizer, the application rate is 30 kg per mu. The method of sowing and fertilizing the two compartments is by means of machine broadcasting. The seeds and fertilizers are separated from the two pipes, and the depth of the fertilizer into the soil is two fingers to two fingers and a half. After planting, the emergence of seedlings is very slow. In late May, the corn leaves are still not stretched. The leaves are dark green. The wind blows the seedlings and shakes them. When the soil is opened by hand, the roots of the corn seedlings are brown and rotten, only the main roots. Roots and root hairs.

Expert: This typical case tells people that the high-concentration compound fertilizer fertilization position is too shallow to burn the seedlings, not the problem of the fertilizer itself.

The spring corn planted by Lao Zhang, the fertilizer is close to the corn seed. After high-nitrogen compound fertilizer dissolves quickly, the high salt concentration of urea-based nitrogen in soil solution inhibits seedling elongation and root development. It can be seen that after applying the qualified fertilizer to the crop, it can produce good fertilizer efficiency, depending not only on the quality of the fertilizer itself, but also on whether the application method is appropriate. The application method includes three major factors: the application period, the application amount, and the fertilization position. How to grasp the fertilization technology? Pay attention to the following points:

1. When applying base fertilizer to corn, cotton and other field crops, the dosage is relatively large, generally in the range of 30-40 kg/mu, and the base fertilizer is a compound fertilizer containing more phosphorus and potassium, so the application method must pay attention to the application. The depth of the soil is 15-20 cm, which can ensure the safety of the seedling period and ensure the nutrient supply in the later stage.

2. The nitrogen in the compound fertilizer is active, and most of the high-nitrogen high-concentration compound fertilizer is urea-based nitrogen, which is water-soluble and quick-acting. If concentrated fertilization is too shallow or too much, it will not only cause the seedlings to burn, but also cause the risk of nitrogen loss. Therefore, the key technology for nitrogen fertilizer to be used as base fertilizer is: one must be applied deep, and the other should be appropriate. Based on this mechanism, nitrogen fertilizer should be applied as base fertilizer and top dressing twice; for high-nitrogen compound fertilizer, except for spring maize in northeast chert region, it is not suitable for one-time application in North China, especially in high temperature and rainy areas in the south. The base and top dressing should be applied separately. This not only enables high nutrient utilization, but also enables safe production.

3. Phosphate fertilizer is not active in the soil. The fertilization position should be applied in two layers. The fertilizer should be applied less and the base fertilizer should be applied in a deeper manner. Agricultural resources report

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