The available phosphorus content of superphosphate is quite different, generally between 12% and 21%. Pure product superphosphate is dark gray or grayish white powder, slightly sour, easy to absorb moisture, easy to agglomerate, and corrosive. Superphosphate is suitable for all kinds of crops and all kinds of soil. The use of high-quality superphosphate in greenhouse vegetables is a good choice. It can supplement phosphate fertilizers and supplement calcium fertilizers.
When superphosphate is used as a basal fertilizer, the application amount per acre can be about 75 kilograms for greenhouses lacking quick-acting phosphorus, and evenly sprinkled in half before turning to the ground to combine the cultivated land as a base fertilizer. Before ridging, sprinkle the other half evenly and apply it to the ground. If the base fertilizer is mixed with organic fertilizer, the dosage of superphosphate should be about 50 kg per mu. Most of the vegetables require large amounts of phosphorus in the early growth stage. They must be applied early and deep, and they should be applied to the dense soil layer of the root system.
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