The organic fertilizer is applied in the vegetable field, and the organic colloid is formed during the decomposition process, and the organic colloid has a strong adsorption capacity for the cation. When the chemical fertilizer is applied to the soil, since the cation is mostly adsorbed by the colloid, the concentration of the soil solution does not rise. Too high can increase the buffering capacity of soil nutrients and greatly reduce the possibility of occurrence of fertilizer damage.
As long as the amount of fertilizer is controlled, the damage will be greatly reduced. Generally, the application of ammonium bicarbonate per mu shall not exceed 30 kg, and the urea shall not exceed 10 kg. It is not advisable to spread it on the soil surface and distribute the fertilizer evenly throughout the tillage layer. The point should be more than 10 cm from the roots of the crop. At present, there are more compound or mixed granular fertilizers, some of which contain about 15% of nitrogen, phosphorus and potassium, and some of them are 10%, etc., so-called NPK ternary compound fertilizer. This fertilizer is often found in the form of granular fertilizer. Although the total nutrient content of granular fertilizers is many, most of them are changed from quick-acting to slow-acting. The granules need to be softened in the soil, and the nutrients are gradually released. This avoids the sudden high concentration of soil solution and burns the root system.
As long as the amount of fertilizer is controlled, the damage will be greatly reduced. Generally, the application of ammonium bicarbonate per mu shall not exceed 30 kg, and the urea shall not exceed 10 kg. It is not advisable to spread it on the soil surface and distribute the fertilizer evenly throughout the tillage layer. The point should be more than 10 cm from the roots of the crop. At present, there are more compound or mixed granular fertilizers, some of which contain about 15% of nitrogen, phosphorus and potassium, and some of them are 10%, etc., so-called NPK ternary compound fertilizer. This fertilizer is often found in the form of granular fertilizer. Although the total nutrient content of granular fertilizers is many, most of them are changed from quick-acting to slow-acting. The granules need to be softened in the soil, and the nutrients are gradually released. This avoids the sudden high concentration of soil solution and burns the root system.
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