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In the field production, when the appearance of the crop is abnormal, many farmers think that the disease has occurred, and consider how to choose pesticides for prevention and treatment. In fact, sometimes many crops include abnormal symptoms of vegetables, which are caused by excessive fertilization or unbalanced fertilization.
Single fertilizer plant in cotton is easy to wither
In the same way that transgenic hybrid insect-resistant cotton was planted, some farmland wilt disease occurred seriously, while others did not develop disease or mild disease and quickly returned to normal growth. The reason can be attributed to the difference in fertilizer application. Among the farmers who did not develop disease in Daejeon, bio-organic fertilizer or humic acid-based organic fertilizer or potash fertilizer was used. Farmers in Daejeon usually use only chemical fertilizers. Bio-organic fertilizers and humic acid-based organic fertilizers contain antibiotics or fulvic acid, which can inhibit the invasion of Fusarium oxysporum. Potassium can increase the activity of cotton plants and enhance the defense against Fusarium oxysporum. The function and role of defense against the invasion of the wilt.
Rarely applied boron fertilizer in rapeseed often "flower but not real"
In the rapeseed production, the phenomenon of “flowering and not realizing†often occurs. It is seen that the flowering is not strong and the production is reduced seriously. In general, this is not a disease caused by pathogens, but it ignores the physiological obstacles caused by the application of boron fertilizer. During the period of flowering and stalking of rapeseed, in the case of continuous rainy weather, rapeseed with nitrogenous fertilizers will grow stronger and the fields will be more shaded, often causing more severe sclerotial sclerotia. No disease or mild disease.
Vegetable micro-fertilizer insufficiency
Many vegetable seedlings appear mosaic, dwarf, twigs, and lines, which are generally diseases caused by viruses. However, if zinc fertilizer is applied to the base fertilizer or zinc fertilizer is applied in time, this abnormality will be reduced or not occurred. Growing up. The occurrence of umbilical rot in tomatoes and peppers, heart rot in cabbages and cabbages, yellowing of broccoli leaves and turning brown, and yellowing of leaves in celery leaves are common. The common cause is the lack of calcium in the soil, which induces the above-mentioned physiological diseases. It is usually not related to the invasion of pathogenic bacteria, but vegetables that lack calcium and sulfur deficiency may provide conditions for bacterial diseases. In addition, changes in temperature and moisture factors may also lead to the occurrence of physiological diseases in vegetable crops. For example, when tomato enters the “cross-border†period, when the average temperature is lower than 15°C, the fruit may be deformed, and the yield and quality will be affected. Another example is high temperature, drought, tomato bud blight may occur, as long as the timely irrigation and cooling can be alleviated without the need for pesticides.
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