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Experts: First of all, we must clearly answer that it is unreasonable to use water-soluble phosphate fertilizer such as superphosphate and granulated phosphorus-containing ternary compound fertilizer as water-flooding, which will also cause nutrient waste. First, the nature of water-soluble phosphate fertilizer is very different, unlike water-soluble nitrogen and potassium fertilizer. It can not penetrate into the soil of the main root system with water, and it is easy to stay in the shallow surface of the earth and interact with calcium, magnesium, iron, aluminum and other components on the soil to form water-insoluble sediment. This is also called The chemical fixation of water-soluble phosphate fertilizer, while the root system of pepper crops is mainly distributed in 0-30 cm, and is fixed by water-soluble phosphorus, which makes phosphorus not be absorbed and utilized by roots and becomes ineffective. Second, because of the poor mobility of water-soluble phosphate fertilizer in the soil, in order to increase the root absorption and utilization of crops. The principle of efficient application of phosphate fertilizer is to increase the contact surface of phosphate fertilizer with the root system, and to reduce the contact between the water-soluble phosphate fertilizer and the large surface of the soil to produce rapid chemical fixation. Therefore, it is better to promote water-soluble phosphate fertilizer with small particles, relatively concentrated, and layered fertilization is better. Third, in view of the special requirements of the phosphorus trophic period of the main crops, the application of the soil profile to the depth of the root concentration, water-soluble phosphate fertilizer should be used as a seed fertilizer, a small amount of shallow application and base fertilizer, a large number of deep application of reasonable methods. In order to ensure the demand for phosphorus in the critical nutrient period of the crop seedling period and the maximum efficiency period of phosphorus nutrition to ensure the flowering result. Fourth, the super-calcium phosphate solution is applied to accelerate the chemical fixation of the water-soluble phosphate fertilizer, or the nutrient which is temporarily difficult to use by the root system, which greatly wastes the phosphate fertilizer, and may also promote the trace elements in the surface soil such as calcium, magnesium and zinc. Fixed and lacking. Fifth, the granular compound fertilizer is formed by secondary processing. It is unreasonable to use the shredded use completely to waste processing costs. (This issue: Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping)
Case: A few days ago, we went to Xuwen County, Zhanjiang City, Guangdong Province, and saw local farmers who were planting peppers. They poured the superphosphate powder containing 16% of available phosphorus into a large tank, and after mixing with water, the above fertilizer was poured into the pepper and the residue was discarded. The same fertilization method is also carried out by the banana farmers who crushed the compound fertilizer particles containing nitrogen, phosphorus and potassium 15-15-15 and then soaked in the large tank and applied the banana ground with the clear liquid. This usage is very common in the local area, and I don’t know if it is scientific and reasonable.
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