Superphosphate, also known as Pu pass calcium phosphate, referred to as Pu calcium. It is the first kind of phosphate fertilizer produced in the world, and it is also a kind of phosphate fertilizer that is commonly used in China. The available phosphorus content of superphosphate is quite different, generally between 12% and 21%. Pure superphosphate is a dark gray or off-white powder, slightly sour, easy to absorb moisture, easy to agglomerate, and corrosive. Dissolved in water (insoluble part is gypsum, about 40% to 50%), it is an acidic quick-acting phosphate fertilizer.
Superphosphate is suitable for various crops and a variety of soils. It can be applied to neutral, calcareous phosphorus-deficient soils to prevent fixation. It can be used as base fertilizer, topdressing, but also as fertilizer and top dressing.
When superphosphate is used as a basal fertilizer, the application amount per acre may be about 50kg for soils lacking quick-acting phosphorus, and evenly spread half of the arable land, and combined with cultivated land as a base fertilizer. Before sowing, evenly sprinkle the other half and combine the shallow preparation with the soil to achieve a layered application of phosphorus. In this way, the effect of the superphosphate fertilizer is better and the utilization of its active ingredient is also high. If the base fertilizer is mixed with organic fertilizer, the application amount of superphosphate should be about 20-25kg. Ditch application, acupoint application, etc. can also be used.
When superphosphate is used as top dressing, the dosage per acre can be controlled at 20 to 30 kg. It should be noted that early application and deep application must be applied to the dense soil layer of the root system. Otherwise, the effect of superphosphate will be poor. If it is used as a fertilizer, the amount of superphosphate per acre should be controlled at about 10kg.
When superphosphate is used as a top dressing, it is necessary to spray before and after the flowering of the crop, and it is best to spray a solution of superphosphate at a concentration of 1% to 3%.
The following issues should be noted in the application of superphosphate:
(1) It cannot be mixed with alkaline fertilizers to prevent acid-base neutralization and reduce fertilizer efficiency.
(2) Mainly used in P-deficient land to facilitate the production of phosphate fertilizer.
(3) The amount of superphosphate must be applied properly. If a large amount of superphosphate is applied consecutively, the effect of phosphate fertilizer will be reduced.
(4) Superphosphate should be crushed during use, otherwise it will affect the uniformity and affect the effect of fertilizer.
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