What happens after applying high-concentration phosphate fertilizer?
What happens when high-concentration phosphate fertilizer is applied? Please explain that the main component of ordinary superphosphate is monocalcium phosphate, and the fertilizer contains 14%-18% phosphorus; the secondary component is calcium sulfate, accounting for about 50%. Therefore, applying ordinary superphosphate not only provides crops with phosphorus nutrition, but also allows crops to obtain sulfur nutrition. However, superphosphate...
What happens when high-concentration phosphate fertilizer is applied? Please explain
The main component of ordinary superphosphate is monocalcium phosphate, and the fertilizer contains 14%-18% phosphorus; the secondary component is calcium sulfate, accounting for about 50%. Therefore, applying ordinary superphosphate not only provides crops with phosphorus nutrition, but also allows crops to obtain sulfur nutrition. However, superphosphate has a low phosphorus content and contains many secondary components. To overcome this shortcoming, triple superphosphate came into being as a phosphate fertilizer variety.
Triple superphosphate has been improved in its manufacturing method, so that the fertilizer does not contain impurities such as calcium sulfate, thereby greatly increasing the phosphorus content and making it a high-concentration phosphate fertilizer. Therefore, long-term application of triple superphosphate will naturally lead to sulfur deficiency problems.
The symptoms of sulfur deficiency in crops are very similar to those of nitrogen deficiency, with the main feature being leaf chlorosis and yellowing, but from the subtle manifestations, they are different. The symptoms of nitrogen deficiency start first from the lower old leaves, while the symptoms of sulfur deficiency start from the upper new leaves. For example, when potatoes are deficient in sulfur, the upper leaves first turn yellow generally, and in severe cases brown spots appear on the leaves.
The phenomenon of soil sulfur deficiency is due to the composition of ordinary superphosphate and triple superphosphate. Therefore, the editor suggests that when planting sulfur-loving crops, ordinary superphosphate should be selected, or the method of alternating application of ordinary superphosphate and triple superphosphate should be adopted, in order to reduce the occurrence of soil sulfur deficiency.
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