Phosphorus fertilizer has solid phosphorus and water-soluble phosphate fertilizer. When applying phosphate fertilizer, solid phosphorus fertilizer is often used as base fertilizer, and water-soluble phosphate fertilizer is used as top-dressing fertilizer. Water-soluble phosphate fertilizer can increase and maintain the phosphorus content of the upper water body in a short time. Generally speaking, the following points should be mastered when using phosphate fertilizers:
First, fertilisers and fertilization time According to the size of the water, water quality, water temperature and type to determine the amount of fertilizer and fertilization time. Superphosphate and phosphorus (P2O5) content is 14%. If superphosphate is used as basal fertilizer, it usually applies 10-12kg per acre. When topdressing, it applies 2-3kg per acre, and it is applied once every ten days. It can also be based on Changes in pond status and fatness increase or decrease. Generally, each application of phosphorus increases the color of water, with yellow-green color, but the transparency of water should be within 25-30cm. The season for applying phosphate fertilizer should be selected from May to September. The best fertilization time is at 10:00 AM.
Second, the selection of high-quality phosphate fertilizer is now a good domestic phosphate fertilizer: superphosphate, calcium magnesium phosphate fertilizer. Superphosphate is widely used due to its wide range of applications and good results. The second is calcium magnesium phosphate fertilizer, and the other has the worst effect such as phosphate rock powder. Now the market has stopped selling and cannot be used.
Third, nitrogen, phosphate fertilizer can not be mixed because nitrogen, phosphate fertilizer used at the same time or mixed application will produce toxic, non-fertilized partial metaphosphate, simply can not produce results. If nitrogen and phosphorus fertilizers are to be applied to water bodies during the cultivation process, it is necessary to apply phosphate fertilizers first followed by nitrogen fertilizers. The order cannot be tripped over, nor can they be carried out simultaneously. In addition, solid phosphate fertilizers cannot be withdrawn directly from the water. Otherwise, the effect is not good, but also easily cause color classes to eat poisoning.
4. Phosphate Fertilizers and Mixed Use of Phyto-Phosphorus etc. Phosphate Fertilizers cannot be mixed with alkali-containing materials such as grass ash and lime. Otherwise, insoluble tricalcium phosphate will be produced and the fertilizer efficiency will be greatly reduced. General requirements for the water to neutral or weak alkaline appropriate, in case of water acidic, the application of phosphate fertilizer will form insoluble iron phosphate and aluminum phosphate, will also reduce the effect of fertilizer. (Luo Huaqing)
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