Organic manure is applied in vegetable fields. Organic colloids are formed during the decomposing process. Organic colloids have strong adsorption ability to cations. When chemical fertilizers are applied to soil, cations are mostly adsorbed by colloids, so the concentration of soil solution will not rise. Too high can increase the buffer capacity of soil nutrients and greatly reduce the possibility of fertilizer damage.
As long as the amount of chemical fertilizers is controlled, the fertilizer damage will be greatly reduced. Ammonium bicarbonate should not exceed 30 kg per mu and urea should not exceed 10 kg. It is not appropriate to spread on the surface of the soil and distribute the fertilizer evenly throughout the entire cultivation layer. Acupuncture points should be more than 10 cm from the roots of the crop. At present, there are many compound or mixed grain fertilizers, some of which contain about 15% of nitrogen, phosphorus and potassium, some of which are 10% and so on, which is the so-called nitrogen, phosphorus and potassium ternary compound fertilizer. This fertilizer is often in the form of granular fertilizer. Although the total nutrients of granular fertilizers are large, most of them change from quick-acting to slow-acting. The particles need to be softened in the soil, and the nutrients are gradually released. This avoids suddenly causing high concentrations of soil solution and burns the root system.
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