Quick dissolving and dispersing of fertilizer and slow dissolving and dispersing

At present, there is a general consensus in the chemical fertilizer market that chemical fertilizers, especially compound (compound) fertilizers, must be "quickly dissolved" and "dispersed" as far as possible. Because farmers mistakenly believe that chemical fertilizers should be "fully soluble" and "rapidly soluble", or at least "disperse quickly", otherwise they are fake fertilizers. However, Thailand and Egypt cemented and mixed NPK fertilizer with raw rubber emulsion to produce slow-release fertilizer; the cemented slow-release fertilizer developed by Zhang Fudao, a researcher at the Institute of soil Fertilizer of the Chinese Academy of Agricultural Sciences and Professor Liao Zongwen of South China Agricultural University, showed that the effect of non-dispersion and slow dispersion was longer than that of quick dispersion, and the nitrogen use efficiency was high. Urea is a fully soluble and instant fertilizer, while a slightly soluble urea-formaldehyde fertilizer is a slow-release fertilizer. It is estimated that the nitrogen use efficiency of compact and slowly dispersed compound fertilizers can be 3% and 5% higher than that of fast-dispersed compound fertilizers. If the output of compound fertilizer in China is 12 million tons N (N) P (phosphorus) K (potassium) (m (N): M (P2O5): M (K2O) = 1RV 0.5), then 6 million tons of N is processed as compound fertilizer, of which 3 million tons of N should be dispersed slowly, and it is artificially dispersed quickly, thus reducing the utilization rate of N from 29% to 25%, it is equivalent to less utilization of 120000 tons of N, equivalent to 260000 tons of urea. If the cost of urea field is 2000 yuan per ton, the annual loss will be 520 million yuan due to this concept.