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Second, after the fertilizer is mixed, its physical properties are good. Some fertilizers do not chemically change after mixing, but it will lead to changes in physical properties, making the mixing process and fertilization process difficult. If two fertilizers with higher hygroscopicity are mixed, the mixture is more hygroscopic. For example, a mixture formed by mixing ammonium nitrate with urea has a hygroscopic critical relative humidity of only 18%, and the hygroscopicity is greatly improved. Therefore, the two should not be mixed. If urea and superphosphate are mixed, although the time for conversion of urea to ammonium can be prolonged, the crystal water contained in the superphosphate will be freed, which will increase the humidity of the fertilizer, easily agglomerate, and cause difficulty in application. With the mixture.
Third, after the fertilizer is mixed, it should be beneficial to improve the fertilizer efficiency and fertilization effect. The proper mixing of fertilizer can not only improve the fertilizer efficiency, but also improve the fertilization effect and reduce the number of fertilization. If the phosphate fertilizer is mixed with compost, manure and other organic fertilizers, organic fertilizers can produce various organic acids during the fermentation decomposition process, which can combine calcium ions and promote the dissolution of phosphorus. At the same time, the contact area between phosphorus and soil can be effectively reduced after mixing. To reduce the fixation of phosphorus in the soil and improve the fertilizer efficiency of the phosphate fertilizer. If ammonium bicarbonate or ammonium sulfate is mixed with superphosphate, it can also improve the effect of fertilizer.
Three principles of fertilizer application
1. After the fertilizer is mixed, the nutrients are not lost. During the mixing or after the storage and application of the fertilizer, due to the different composition of various fertilizers, some fertilizers will react after a series of chemical reactions, resulting in loss of nutrients or nutrients. The effectiveness has decreased. Fertilizers that fall into this category cannot be mixed with each other. For example, ammonium nitrogen fertilizer can not be mixed with alkaline fertilizers such as ash, ash, potassium, lime, etc., otherwise it will cause nitrogen loss; water-soluble phosphate fertilizer can not be mixed with alkaline fertilizers such as lime, ash, ash and potassium to avoid water solubility. Phosphorus is converted into poorly soluble phosphorus, which reduces the effectiveness of phosphorus. The nitrate nitrogen fertilizer cannot be mixed with acidic fertilizers such as superphosphate, so as to avoid the decomposition of nitrate nitrogen to escape nitrogen oxide and cause nitrogen loss.
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