How to apply DAP reasonably

Q: In recent years, farmers have been particularly interested in diammonium phosphate. What are the characteristics of diammonium phosphate in fertilizer efficiency? A: Diammonium phosphate is a compound fertilizer containing N18%, P2O5, and 46%. It is a low-nitrogen, high-phosphorus fertilizer that works particularly well on phosphorus-deficient soils. Many farmland soils in China are deficient in phosphorus. Farmers initially applied diammonium phosphate to various crops to increase their production. The farmers are particularly interested in it, that is, fertilizers are applied to the road. Q: Some farmers think that "If you want to use diammonium, you must use diammonium imported from the United States." Is this correct? A: This is not correct, because whether it is produced in China or produced in the United States, DAP is chemically the same. They contain N18%, P2O5, and 46%. The peasants had the idea that the time for applying diammonium was relatively early and there was feeling for it; the second was the fear that the quality of diammonium phosphate produced in China would not be guaranteed. In fact, such concerns of farmers are unnecessary. Q: Is there monoammonium phosphate and diammonium phosphate sold on the market, are they all the same fertilizers? A: Strictly speaking, monoammonium phosphate, its composition is containing N12%, containing P2O5, 52% of the compound fertilizer. Diammonium phosphate is compound fertilizer containing N18%, P2O5, and 46%. Their nutrient content is different. The ammonium content of monoammonium phosphate is lower than that of diammonium phosphate, and its P2O5-containing rate is higher than that of diammonium phosphate. You don't need to mind if you don't have a large amount. Q: But there are also some farmers who report that the fertilizer effect is not ideal after years of application of DAP. Why is this? A: In front, DAP was a kind of binary compound fertilizer with low nitrogen and high phosphorus content. In phosphorus-depleted soils, no matter what kind of crops are planted, significant yield increase can be achieved in the first year. This is because fertilization is the right way to solve the main contradiction between crop phosphorus and soil phosphorus deficiency. If only the diammonium phosphate is applied year after year, and no nitrogen-containing fertilizer is added, the effect is not good. This is because the old contradiction of soil phosphorus deficiency is solved, and nitrogen deficiency has become a new contradiction that affects the increase of crop yield. Q: Why is the effect of applying diammonium phosphate fertilizers bad for years? A: Different from phosphate fertilizer and nitrogen fertilizer, it will only produce chemical fixation of phosphorus and reduce fertilizer effect when applied to the soil. Unlike nitrogen fertilizer, it has losses of volatilization, leaching and denitrification, nitric nitrogen, etc. Therefore, the actual utilization rate of phosphate fertilizer is high. This is very different from the low nitrogen utilization rate. Therefore, long-term application of diammonium phosphate, soil available phosphorus content will increase rapidly. Rational application of diammonium phosphate must be based on changes in soil available phosphorus content, timely adjustment of fertilizer formulations, coupled with the application of phosphorus and potassium fertilizer, in line with the principle of balanced fertilization, give full play to its role in increasing production. Q: Then, how should farmers rationally apply DAP? Answer: On the one hand, we must correctly understand that DAP is not a omnipotent fertilizer. It is a compound fertilizer with low nitrogen and high phosphorus. It is used on phosphorus-deficient soil and it is effective regardless of crop species. On the Other hand, it should also be understood that phosphate fertilizers cannot replace nitrogen fertilizers. Don't forget that crops need various nutrients. Long-term use of diammonium phosphate as base fertilizer will inevitably lead to shortage of nitrogen and potassium. Therefore, it is necessary to apply simple nitrogen and potassium fertilizers in order to achieve balance. Fertilization will increase crop yields further. Experts suggest that diammonium phosphate is a good fertilizer and is used effectively in phosphorus-deficient soils, but its nutrients are not comprehensive, and it is necessary to supplement fertilizers with other nutrients to keep in mind balanced fertilization. The reason that the long-term application of diammonium phosphate is not effective is that the content of available phosphorus in the soil increases rapidly and new nutrient imbalance occurs.

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