At present, with the continuous development of high-efficiency agriculture, greenhouse vegetables have developed rapidly. However, due to some technologies can not keep up, especially the way of fertilization is not reasonable, the harm to vegetables is relatively large. Some vegetable farmers are easy to map. When fertilizing, they are often sprinkled. I do not know, greenhouse vegetables spread the harmful effects of fertilizer, the light results in loss of fertilizer, vegetables, production, and in severe cases will cause the death of whole greenhouse vegetables. The main performance is as follows:
The first is ammonia poisoning. The nitrogen in nitrogen fertilizer or compound fertilizer is met with surface water after being sprinkled. It will rapidly decompose at high temperature and escape ammonia. Because of the tightness of the greenhouse, the ammonia concentration will continue to increase. When the concentration reaches a certain value (such as cucumber, tomato in the 510-6 for 15 hours or 4010-6 only a few hours) will lead to vegetable death.
The second is to exacerbate soil salt damage. Due to the specific micro-climate conditions of greenhouses, combined with large amounts of fertilizer, long soil covering time in greenhouses, little or no rainwater leaching, and large evaporation of surface water in greenhouses, soil salt damage has gradually become the current greenhouse production. One of the major obstacles. In the case of deep application of general fertilizers, salt accumulation in surface soil requires the rising of soil moisture to bring salt to the soil surface. The application of fertilizer on the surface directly accelerates the occurrence of salt damage in the surface soil.
The third is not conducive to the lower bar of vegetable roots. The growth of vegetable roots is fattening, and the root system always extends in the direction of fertilizer. Due to the application of fertilizer on the surface, it is not only unfavorable for the down-rooting of vegetable roots, which affects the development of the root system, but also the surface roots are susceptible to salt damage, thus damaging the root system.
Therefore, the author reminded the vegetable farmers that in the greenhouse vegetable production process, we must change the bad habits of spreading fertilizer. Deep fertilize and then cover the soil. At the same time pay attention to water pressure salt, improve fertilizer efficiency. (Zheng Lei)
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