The important effect of organic fertilizer on crops and NPK fertilizer
1. In the actual agricultural production, the utilization rate of chemical fertilizer is only 30% - 45%. Some of the lost chemical fertilizers are released into the atmosphere, some of them are lost with the water and soil flow, and some of them are fixed in the soil and can not be directly absorbed and used by plants. Moreover, it will cause adverse consequences such as soil salinization and hardening. When we apply organic fertilizer, its beneficial biological activities can improve the soil structure, increase the soil's ability to retain water and fertilizer, thereby reducing the loss of nutrients. Coupled with the effect of organic matter beneficial microorganisms to dissolve phosphorus and potassium, the effective utilization rate of fertilizer can be increased to more than 50%. The application of organic fertilizer manufacturing process is becoming more and more extensive.
2. Organic fertilizer can increase crop yield and improve the quality of agricultural products. Under the condition of the same nutrient elements, the effect of organic fertilizer is better than that of chemical fertilizer when it is used as base fertilizer. When applied as topdressing, the effect of fully decomposed organic fertilizer is often better than that of chemical fertilizer, especially in improving the quality of agricultural products. Therefore, in the manufacturing of NPK fertilizer, adding organic fertilizer into raw materials is more effective.
3. Organic fertilizer can promote the growth of soil microorganism and strengthen the absorption and utilization of crops. Organic fertilizer contains a lot of organic matter, which is a place for the growth and reproduction of various microorganisms. The organic matter of organic fertilizer can also produce various phenols, vitamins, enzymes, auxin and hormone like substances in the process of decomposition, which can promote the growth of crop roots and the absorption of nutrients.
4. Reduce nutrient fixation and improve nutrient availability. Organic fertilizer contains a lot of organic acids, humic acids and other hydroxyl substances, which have strong chelating capacity, can chelate with many metal elements to form chelates, which can prevent the soil from fixing these nutrients and failure. For example, organic acids and other chelates in organic fertilizer can chelate aluminum ions with high activity in soil, prevent the combination of aluminum and phosphorus to form closed storage phosphorus which is difficult to be absorbed by crops, and greatly improve the content of available phosphorus in soil.