1, biuret exceeded. Urea produces biuret during the melting process. Once the biuret content exceeds 2%, it can easily produce toxic effects on crop seeds and seedlings. If the compound fertilizer is improperly handled during the production process, biuret can easily be produced, which also poses a potential threat to the growth of corn.
2, fertilizer formula is irrational. In traditional compound fertilizer formulations, the nitrogen content is generally not more than 15%. At present, the content of nitrogen in some compound fertilizer formulations often exceeds 20%. With the increase of nitrogen content, the fertilization method should pay special attention to the separation of seed fertilizers. If the nitrogen concentration is too high, it will be prone to produce fertilizers, resulting in burning roots and rot.
3. If organic fertilizers that are not completely cooked or ripened are applied to the soil, a large amount of organic acids and heat will be generated during the decomposition process, which can easily cause burning of roots.
4. Precipitation during corn seedling period is high, resulting in high soil moisture content in the soil and rapid dissolution of fertilizers. In addition, the plough bottom layer is shallow, hard, and the growth of the root system is limited. The local soil solution is always in a high concentration state, resulting in insufficient water supply and slow seedling growth. Seriously caused the backflow of water in the crop and the plant died of water loss. At the same time, due to the hard bottom layer of the soil plough, the slow downfiltration of the fertilizer after melting, resulting in the root system contact with a high concentration of fertilizer solution, but also prone to burning seedlings.
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