Benefits of combined use of organic fertilizers

1, can improve fertilizer efficiency such as calcium superphosphate, trace elements and other fertilizers, applied to the soil after being fixed by the soil and invalid. When mixed with organic fertilizer, it reduces the contact surface with soil and reduces the fixation of nutrients. Organic fertilizer can also improve the solubility of phosphate rock, which is better under paddy field conditions. When many chemical fertilizers are mixed with organic fertilizers, the fertilizers can be absorbed and stored by organic fertilizers to reduce losses. In addition, chemical fertilizer mixed with organic fertilizer can also promote the decomposition of organic fertilizer and improve fertilizer efficiency. The results showed that the combination of chemical fertilizer and organic fertilizer could reduce soil oxidation-reduction potential, nitrification of ammonia and volatilization loss of nitrogen. Generally, it can increase nitrogen use efficiency by 10%~15%. 2, can reduce some of the adverse side effects of chemical fertilizer may occur in the application of a large amount of chemical fertilizer alone or uneven application of chemical fertilizer, high concentration of soil solution, affecting crop water absorption, and even root damage, such as mixed with organic fertilizer will not occur this problem. In addition, if long-term application of physiological acid fertilizer alone, it will make the soil acidic, and produce excessive active iron, active aluminum and other harmful substances, causing toxicity to crops. When mixed with organic fertilizer, it can increase the buffer capacity of soil and prevent soil acidification. Another example is that some calcium superphosphate contains too much free acid, which will affect seed germination and seedling growth when making seed fertilizer. After adding organic fertilizer, neutralizing free acid can reduce damage to seeds. 3, can increase crop nutrition organic fertilizer contains more complete nutrients, fertilizer efficiency is stable and long, containing more organic matter, can improve soil organic matter content, improve soil physical and chemical properties. It can not only supply crops, but also supply soil microorganisms with nutrients such as nitrogen, phosphorus and potassium, as well as vitamins and growth hormones. After organic fertilizer was applied, soil enzyme activity was enhanced, which was beneficial to nutrient transformation. For example, organic fertilizer mixed with calcium superphosphate or magnesium superphosphate fertilizer can promote the growth of free-living nitrogen-fixing bacteria in the soil and increase crop nitrogen nutrition. According to the experiment, the organic matter content of the plot with chemical fertilizer and organic fertilizer for 3 years is 0.08%~0.11% higher than that of the plot with chemical fertilizer alone, the ammoniating bacteria increase by 260%, the aerobic nitrogen-fixing bacteria increase by 119%, and the cellulose decomposing bacteria increase by 600%. 4. When straw is returned to the field and undecomposed organic fertilizer is applied, chemical nitrogen fertilizer can be added to avoid the slow supply speed of crops due to early nitrogen deficiency, and the grain crops need to provide nitrate nitrogen and ammonium nitrogen at the same time at the mature stage. Organic fertilizer can do this.