The symptoms of yellow leaves, lobule, and drop and fruit drop of vegetables are all related to the deficiency of nutrients, and this phenomenon is prone to spread year by year. According to the analysis of experts, there are mainly four reasons.
The first is that there are more days when the environment is poor, and the lack of vegetables in greenhouses is increasing. Because there are more cloudy days and the temperature is lower, the temperature in the shed continues to be low, resulting in root injury, affecting its absorption of nutrients, and the lack of symptoms. In addition, the lack of sufficient sunshine during the cloudy days leads to malnutrition in the crops, the inability of carbohydrates to convert, and the fact that the leaves are too thick and small, and the roots (especially the root tip) are injured, brown and free of new roots. In water management, there are many phenomenon of vegetable roots that can not normally absorb nutrients, and vegetables are bound to suffer from deficiency of hormones. At this time, the spraying of foliar fertilizer is the most effective solution because of the small amount of foliar fertilizer, quick effect, and high efficiency.
The second is that the use of trace elements must not be caused by some vegetable farmers in order to pursue high yields, blindly to the large shed to apply chemical fertilizers, while ignoring the application of trace elements, in the long run cause the soil nitrogen, phosphorus, potassium generally more, and trace Not enough elements. Some vegetable farmers use excessive amounts of certain trace elements, because the antagonism will inhibit the absorption of other elements in the roots, thus showing symptoms of nutrient deficiency.
Third, the concentration of soil solution in the shed is too high due to the large number of chemical fertilizers used by vegetable farmers all year round, resulting in high soil solution concentrations, plant root development, and can not absorb enough nutrients to supply plant growth, plant expression deficiency.
Fourth, many vegetable farmers know little about deficiency susceptibility and inappropriate prevention and control Some vegetable farmers see yellowing of vegetable leaves. They think that the amount of fertilizer used is not enough, so that a large amount of chemical fertilizers are used again. The result is often counter-productive. As everyone knows, the main reason for the yellow leaves of vegetables is the lack of zinc, magnesium and other elements. And if you do not understand the symptoms of deficiency, blindly use drugs, fat, resulting in more and more severe deficiency of vegetables. Therefore, more guidance should be given to vegetable farmers so that they can distinguish various symptoms of deficiency.
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