Identification of crop fat damage and its preventive measures

I. Identification of Crop Fertilizers The characteristics of crop damage are mainly as follows:
(1) Dehydration: Excessive fertilization, or excessive soil drought, the local concentration of soil nutrients is too high after fertilization, causing the crop to lose water and appear wilting.
(2) Burns: Apply high-volatility fertilizers (such as ammonium bicarbonate) under high temperature in the hot sun, causing burns (burning) of leaves or young tissues of crops.
(3) Poisoning: the "biuret" in urea exceeds 2%, or the free acid content in superphosphate is higher than 5%. After application to the soil, the roots of the crop are poisoned and rotted;
(4) stagnation: Applying a large amount of unfertilized organic fertilizer, because it decomposes heat and releases harmful gases such as methane, causing toxicity to crop seeds or roots, affecting the growth and development of crops.
Second, the prevention of crop fat damage (1) species, fertilizer isolation. When applying the seed fertilizer, the seed and fertilizer should be isolated, and the direct contact between the fertilizer and the seed should be avoided to cause the seedling.
(2) Reasonable water supply. When the soil is too dry, it is advisable to fertilize the water first, or fertilize the fertilizer with water; when applying fertile chemical fertilizer in the paddy field, it is advisable to maintain a suitable shallow layer in the field and then cultivate the field immediately after application.
(3) Apply fertilizer evenly. When applying fertilizer, pay attention to uniform application. If necessary, mix with appropriate amount of mud powder or fine sand.
(4) Fertilize at the right time. Generally, it should be mastered after the sunrise dew is dry, or fertilized in the afternoon, and should not be carried out in the air in the hot sun. In addition, it is necessary to adhere to the application of fully decomposed organic fertilizer. In the process of applying fertilizer, pay attention to placing the unapplied fertilizer in the downwind to prevent the volatilized gas from being blown by the wind to the crop.
(5) If the crop is inadvertently caused by fertilizer, it should promptly adopt appropriate measures such as appropriate irrigation, drainage, or removal of the affected part to control the development of fertilizer damage and promote the growth of normal growth.