What kind of phosphate fertilizer is suitable for drip irrigation system
The phosphate fertilizer used in drip irrigation system must be water soluble. The traditional phosphate fertilizer, such as calcium superphosphate, is mainly composed of water-soluble calcium dihydrogen phosphate, but there are other insoluble impurities, so it is not suitable for drip irrigation system. Monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate and phosphoric acid are all completely soluble and are good sources of nitrogen, phosphorus and potassium fertilizer. But pure potassium dihydrogen phosphate is very expensive and is not acceptable to ordinary farmers. Although phosphoric acid has high phosphorus content and good solubility, it has strong corrosiveness, low safety, accidents in the process of operation and high management requirements, so it has not been widely used in our country. Industrial-grade monoammonium phosphate and diammonium phosphate have good water solubility and few impurities, so they can be used for fertilization in drip irrigation system.
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The selection of potash fertilizer varieties should be "four looks".
There are many kinds of nitrogen-containing fertilizers, such as urea, ammonium sulfate, ammonium bicarbonate, ammonium chloride, ammonium nitrate and so on. Ammonium urea, a new type of nitrogen fertilizer with high utilization rate, entered the farmland, which greatly improved the nitrogen use efficiency. Compared with urea, ammonium urea has the following advantages. One.
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How to distinguish the good from the bad of phosphate fertilizer
August to October is the suitable sowing time for autumn crops in the south, such as rape, broad beans, green manure, potatoes and a variety of autumn vegetables. Experienced farmers understand that autumn sowing crops emphasize the application of phosphate fertilizer, which is based on the causal relationship among crops, soil and fertilizer.
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