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One, chicken manure and other organic fertilizers are not caused by fertilizer damage. Mainly fresh livestock and poultry manure have not been decomposed, but are directly applied to the vegetable field, and organic acids and heat are generated during the decomposition process, causing damage to the crop roots. In addition, the ammonia produced during the decomposing process of chicken manure often damages the vegetable leaves.
For the fertilizer damage caused by this kind of situation, first, it should be watered in time to reduce the degree of fertilizer damage to the root system. The second is that for severely rooted vegetables, rooting agents or chitin or black cattle black liquor can be used to irrigate roots to promote new root germination. The third is to pay attention to strengthening the ventilation in the shed to prevent the ammonia from staying in the shed for too long.
Second, fertilizer caused by excessive fertilizer. Too much nitrogen fertilizer is used in vegetable fields. During the nitrification process, nitrite accumulation often occurs and nitrous acid poisons occur. The roots turn brown and the leaves turn yellow. When the nitrogen is surplus, it will cause calcium deficiency in the vegetables. Cabbage dried and burned; when nitrate nitrogen is too much, it causes vegetables to lose green and lack molybdenum. Similarly, the application of potassium fertilizer will hinder the absorption of calcium and magnesium, and at the same time it will prevent the absorption of boron by crops and cause crack stem disease in celery.
If the fertilizer damage appears in this case, it should be watered in time to dilute the concentration of the fertilizer solution in the soil so as to prevent the vegetable roots from being damaged. For root-burning vegetables, the growth regulators mentioned in (Article 1) can also be used to irrigate roots to promote the germination of new roots. In the later management, formula fertilization should be applied to reduce nitrogen, phosphorus and potassium, organic fertilizer, NPK, and trace element fertilizers. At the same time pay attention to grasp the principle of a small amount of ground facilities, avoid excessive application of high concentrations of fertilizer.
Third, the amount of foliar fertilizer is too large or chaotic confusion caused by fertilizer. For the fertilizer damage in this situation, the leaves should be washed with clean water in time to prevent the residual fertilizer on the leaves from continuing to damage them. Then use 6000 times the liquid of love to receive or Yunda 120 foliar spray, can ease the damage, promote plant growth. Pay attention to the application of foliar fertilizer to achieve the best concentration to get a multiplier effect. If the concentration is too high and it is sprayed at high temperature at noon, it will be prone to fertilizer damage.
In recent years, the vegetables in protected areas have suffered from serious damages, which manifested as poor root development, less new roots, brown roots, water-drenched leaves above the ground, yellow-white or light brown leaves, and severe leaf water loss. Weary, individual plants have died. Several common symptoms and causes of fertilizer damage are now analyzed: