First, the causes of fertilizer damage

1. Blind nitrogen fertilizer application. In production, people always think that crops have a large demand for nitrogen fertilizer. Therefore, once crops grow poorly, they will not ask questions about lack of crops. All nitrogen fertilizers will be applied more and more nitrogen fertilizers will cause more nitrogen fertilizer and produce fertilizer damage. In particular, the use of volatile nitrogen fertilizers, such as ammonium bicarbonate and ammonia water, can easily cause crops to suffer from fertilizer damage; excessive use of nitrogen fertilizers can also result in nitrate accumulation in plants and yellowing of leaves. Excessive use of nitrate nitrogen fertilizers can easily lead to crop loss of green molybdenum.

2. The amount of topdressing is too large. Excessive application of chemical fertilizer or manure urine at a time will result in excessively high soil nutrient concentration, which will cause crop roots to absorb nutrients and moisture, thus causing fertilizer damage.

3. Apply unripe organic fertilizer. Uncooked organic fertilizers produce a large amount of organic acids and heat during the decomposition process, which can easily cause burning.

4. The top dressing is too close to the root of the crop. Due to the fast and high fertilizer efficiency of chemical decomposition, it is easy to make crops produce fertilizers because the top dressing is too close to the root system.

Second, prevention measures

1. No organic fertilizer applied. Organic fertilizers must be decomposed before application, especially when poultry manures are fermented and mixed with chemical fertilizers.

2. Use chemical fertilizers rationally. The use must be measured and applied at a concentration. In particular, nitrogen must not be excessive at one time. Foliar spray concentration should not be too high, 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, which can greatly reduce the occurrence of fertilizer damage.

4. Fertilization should be about 10cm away from the root of the crop, and deeper. 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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