1. Fertilizers such as superphosphate and trace elements can be used to improve fertilizer efficiency, and they can be immobilized in the soil and become ineffective when applied to the soil. When used in combination with organic fertilizers, it reduces the contact surface with the soil and reduces the fixing of nutrients. Organic fertilizers can also increase the solubility of phosphate rock and are better under paddy conditions. After many fertilizers are mixed with organic fertilizers, fertilizers can be absorbed by organic fertilizers to reduce losses. In addition, organic fertilizer with organic fertilizer can also promote the maturity of organic fertilizer, improve fertilizer efficiency. Experiments have shown that the use of chemical fertilizers in combination with organic fertilizers can both reduce the soil redox potential and reduce ammonia nitration, as well as reduce the loss of nitrogen. Generally can improve nitrogen fertilizer utilization by 10% to 15%. 2, can reduce some of the unfavorable side effects of fertilizer may occur in the application of large quantification of fertilizer alone or chemical fertilizer is not uniform, the concentration of soil solution is high, affect crop water absorption, and even hurt the root, such as mixing with organic fertilizer will not happen this problem. In addition, if the physiological acid fertilizer is applied alone for a long period of time, the soil will become acid, and excessive active iron, active aluminum and other harmful substances will be generated, and the crop will be poisoned. In combination with organic fertilizers, soil buffering performance can be increased and soil acidification can be prevented. Another example is that some superphosphates contain too much free acid, which can affect seed germination and seedling growth when used as a seed fertilizer. Neutralization of free acid after adding organic fertilizer can reduce the damage to seeds. 3, can increase the nutritional nutrients contained in the crop nutrient organic fertilizer than the whole, fertilizer effect is stable and long, contains more organic matter, can increase soil organic matter content, improve soil physical and chemical properties. Not only can supply crops, but also can supply soil microorganisms with nitrogen, phosphorus, potassium and other nutrients, as well as vitamins and growth hormone. After the application of organic fertilizer, soil enzyme activity is enhanced, which is conducive to nutrient conversion. Such as organic fertilizer mixed with superphosphate or superphosphate magnesium fertilizer can promote the growth of aerobic bacteria in the soil, increase crop nitrogen nutrition. According to experiments, the use of chemical fertilizers with organic fertilizers for three years is higher than that of single fertilizers with organic matter content of 0.08%-0.11%, ammoniated bacteria is increased by 260%, aerobic nitrogen-fixing bacteria is increased by 119%, and cellulolytic bacteria are increased by 600%. %. 4. When straws are returned to farmland and unfertilized organic fertilizers are used, adding chemical nitrogen fertilizer can avoid the slow supply of crops due to early nitrogen deficiency and affect the growth. Moreover, it is necessary to provide nitrate nitrogen and ammonium at the same time in the mature stage of cereal crops. Nitrogen and organic fertilizers can do this.
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