What causes the lack of sulfur in the soil? In recent years, the phenomenon of soil sulfur deficiency has become more and more serious. This is only after the high concentration of heavy superphosphate has been used in recent years. What is going on?
The main component of calcium phosphate is calcium monophosphate, the fertilizer contains 14% to 18% phosphorus; the secondary component is calcium sulfate, accounting for about 50%. Therefore, the application of calcium phosphate not only provides phosphorus nutrition to the crop, but also allows the crop to obtain sulfur nutrition. However, superphosphate has a low phosphorus content and contains many sub-components. In order to overcome this shortcoming, there is a variety of phosphate fertilizers that are heavy superphosphate.
The heavy superphosphate has been improved in the manufacturing method so that the fertilizer does not contain impurities such as calcium sulfate, so that the phosphorus content is greatly increased and becomes a high concentration phosphate fertilizer. Therefore, the application of heavy superphosphate over the years will naturally lead to sulfur deficiency.
The symptoms of sulfur deficiency in crops are very similar to those of nitrogen deficiency. The main feature is that the leaves are chlorotic and yellow, but they are different in terms of subtle performance. The symptoms of nitrogen deficiency begin with the lower old leaves, and the symptoms of sulfur deficiency begin with the upper new leaves. For example, when the potato is deficient in sulfur, the upper leaves are generally yellowed, and in the severe case, brown spots appear on the leaves.
The phenomenon of soil sulfur deficiency is due to the problem of the composition of calcium phosphate and heavy superphosphate. Therefore, it is suggested that everyone should use calcium phosphate when planting sulfur-cured crops, or adopt alternating calcium phosphate and heavy The method of superphosphate can reduce the occurrence of sulfur deficiency in soil.
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