It is a common reason to fertilize the land and fertilize it, but it cannot increase the amount of fertilizer or rely solely on chemical fertilizer.
Rational fertilization can make plants grow robust and develop normally, which means that the plant's genetic potential, including disease resistance, can be expressed normally. Therefore, all cultivation management measures that are conducive to the normal growth of plants, including fertilization, can help prevent disease. Fitness cultivation has become a fundamental measure to prevent and cure a variety of diseases.
It is well known that severe fat deficiency or excessive fertilization can lead to physiological diseases, called deficiency or fat damage. In most cases, inappropriate fertilization may not cause significant abnormalities, but may reduce the disease resistance of the plant . Rice blast, sheath blight, wheat powdery mildew, tobacco brown spot disease, etc. are often referred to as high-fertility diseases. Here, “high-fertilizer†actually refers to nitrogen fertilizer. Too much nitrogen fertilizer, late or too concentrated, often cause long mad rice plants, leaves under weak Phi vivo Ammonium and free amino acid content is too high, reducing the ratio of carbon and nitrogen, eventually weakening the resistance of rice. Excessive nitrogen fertilizer will also cause plant toughness and long dew condensation, providing suitable environmental conditions for fungal diseases ; on the contrary, rice mayard, apple tree rot, wheat root rot, Solanaceae early blight, green Blight, as well as the catastrophic disease that often occurs on most plant seedlings, often occurs in areas where the lack of fertilizer occurs . In 1943 , a rice-spotted pandemic in Bangladesh, India, led to the famous Bangladesh famine, drought and lack of fertilizer were important reasons.
Under normal circumstances, the application of phosphorus and potassium fertilizers can improve the balance of nutrients in plants and promote crop maturation, thereby avoiding the pathogens infesting young tissues and enhancing the resistance to disease. In particular for topical infected plant root, stem and leaf tissue fungal diseases, such as wheat stem rust, barley all disease, potato scab, tomato early blight, corn stalk rot and the like. However, excess phosphorus may exacerbate disease virus spinach and wheat septoria nodorum, excess potassium blast may aggravate hazards and root knot nematode.
In some areas, due to the long-term excessive dependence on chemical fertilizers, the organic matter content of some farmland has decreased significantly. In addition, the use of chemical agents is abundant, soil microbial species are poor, and the ability to inhibit soil-borne diseases is reduced. This is the blight and grain of many crops in recent years. The main cause of the increase in blight, root rot and nematode. Use decomposition of organic fertilizer and microbial fertilizer will undoubtedly increase the type and quantity, it is to reduce or suppress soil-borne diseases cure measures. Of course, we must also emphasize the maturity of organic fertilizer, otherwise fertilization can also spread pests and grass seeds.
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