The application of nitrogen fertilizer to summer maize, wild summer maize, and vegetative organ growth, the formation of carbohydrates for the synthesis of protein, the formation of fibers and lignin is reduced, the mechanical organization of stems and leaf tips is underdeveloped, stems are soft, easy Collapsed, and delayed flowering.
It is easy to infect the insect pests with excessive nitrogen application. The soluble nitrogen of maize plants increased, the cell protoplasm was rich, the cell walls became thinner, the leaves drooped, the air and light were poor between groups, and the air humidity was high, which was conducive to the occurrence of pests and diseases. Reduced pest and disease ability.
Affecting the absorption of trace elements by crops and reducing the ammonium and ammonium carbamide in fertilized nitrogen fertilizers, the bicarbonate produced by decomposition will seriously affect the absorption of zinc by maize. For example, if nitrogen fertilizers are applied when the corn seedlings are stiff, the stiff seedlings will become stiffer; if there is too much nitrogen in the soil and the rainy season is met with rain, the starch stored in the pollen grains will be significantly reduced, resulting in poor fertilization and an increase in pods.
Destruction of soil structure Nitrogen fertilizers do not contain organic matter and do not have the effect of improving soils; single application and long-term application of nitrogen fertilizers will gradually compact the soil and cause changes in soil acidity and alkalinity.