Gas harm, ammonia easily from the stomata and water hole in the leaves of the vegetables, causing alkaline harm in the plant body. The leaves of the victim crops were initially immersed in water and gradually turned to light brown. The young shoots or growing points were atrophic and black. When the leaves were severe, they were scorched and the whole plant died of physiological water loss. There are four causes of harm. First, the use of inadequate decomposition of manure; the second is fermented cake fertilizer or chicken manure in the greenhouse; Third, fertilization when spreading fertilizer on the ground; Fourth, uneven fertilization, such as a sudden encounter high temperature weather, easy to concentrate induced ammonia damage.
Fertilizer harm, the single application of a chemical fertilizer or excessive application of chemical fertilizers, commodity organic fertilizer to the soil, resulting in excessive concentration of soil solution, resulting in reverse osmosis, resulting in the inhibition of vegetable root development, plant wilting or leaf margin charred, there is a deficiency of disease .
The phytotoxicity, first, the dominant phytotoxicity, the symptoms are obvious; second, the hidden phytotoxicity, the symptoms lurk or extend to the lower jaw. After the injury occurs, the leaves of the vegetables lose their green or produce spotted spots, perforation, falling leaves, falling flowers, falling fruit, or even the whole plant withering. There are four causes of harm. One is that the pesticide species is not in the right direction or misuse of herbicides; the second is the excessive application of pesticides; the third is the purchase of inferior pesticides; the fourth is the use of pesticides in high temperature seasons.
In drought, drought not only affects the sowing of vegetables and seedlings, but also affects the growth and development of vegetables. It also makes it difficult to apply fertilizers and drugs. There are three causes of harm. First, improper site selection and lack of water sources; Second, poor water quality; Third, ditches, irrigation and drainage facilities are not matched, and water is difficult to draw.
Even the damage is the same or similar vegetable in the same shed, annual or seasonal season, and the yield and quality are decreasing year by year. There are three causes of harm. First, the same or similar vegetables prefer a certain kind of nutrient elements, and such elements are not timely supplemented; Second, the accumulation of soil pathogens causes disease; Third, root exudates cause imbalance of soil microbial community structure and soil aging.
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