It is well-known that excessive application of chemical fertilizers at one time can result in excessively high concentrations of soil fertilizers, impede the absorption of nutrients and moisture in the roots of crops, and cause fertilizer damage. In fact, in addition to this, the causes of fatal injuries include:
Blind nitrogen fertilizer application. Most growers believe that crops have the greatest demand for nitrogen fertilizers. Therefore, once crops grow poorly, nitrogen fertilizers are often applied regardless of the reason. Nitrogen fertilizers are applied more and more, causing excess nitrogen fertilizers and causing fertilizer damage, especially the application of volatile hydrogen carbonate. Nitrogen fertilizers such as ammonium and ammonia make it easier for crops to suffer from fertilizer damage. Excessive application of nitrogen fertilizer will also cause the accumulation of nitrate in the plants, and the leaves will turn yellow. Among them, excessive application of nitrate nitrogen fertilizers will also cause crops to lose chlorosis and lack molybdenum.
Apply unripe organic fertilizer. Uncooked organic fertilizers produce large amounts of organic acids and heat during the decomposition process, causing burning of roots.
The topdressing is too close to the roots of the crop and it is easy to produce crops.
In order to prevent crops from being fattened, the following measures can be taken: 1. No unfermented organic fertilizer is applied, and poultry manure is mixed with chemical fertilizers after fermentation. 2. Fertilizers must be tested on the soil and applied according to the concentration, especially nitrogen fertilizer can not be applied too much at one time. Foliar spray fertilizer concentration should not be too high, especially when urea for foliar fertilizer, the concentration should not exceed 0.3%, spray wet. 3. Add organic fertilizer. The organic fertilizer applied to the soil has a strong adsorption capacity for cations, so that the concentration is not too high, and the buffer capacity of soil nutrients is increased, thereby greatly reducing the occurrence of fertilizer damage. 4. Fertilize about 10 centimeters from the root of the crop, and apply it deeply. Immediately after dressing, cover the soil to prevent seedlings from burning and losing fertilizer. Soil dry topdressing requires timely irrigation, lowering the concentration, and avoiding the phenomenon of burning seedlings.
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