In recent years, the occurrence of soil sulfur deficiency has become more and more serious. This has only occurred in recent years with excessive concentrations of heavy calcium superphosphate. How is this going to happen?
The main component of calcium phosphate is phosphorus monocalcium phosphate, which contains 14%-l8% phosphorous, and calcium sulfate, which accounts for about 50%. Therefore, the application of universal calcium phosphate can not only provide phosphorus nutrition to crops, but also enable crops to obtain sulfur nutrition. However, superphosphate has a low phosphorus content and contains a large amount of accessory components. In order to overcome this shortcoming, there has been a type of phosphate fertilizer that is heavy calcium phosphate.
The heavy calcium phosphate is improved in the manufacturing method, so that impurities such as calcium sulfate are not contained in the fertilizer, so that the content of phosphorus is greatly increased and becomes a high concentration of phosphate fertilizer. Therefore, the problem of sulfur deficiency naturally occurs when calcium superphosphate is applied year-round.
The symptoms of crop sulfur deficiency are very similar to those of nitrogen deficiency. The main feature is the chlorotic chlorosis of leaves, but from the subtle manifestations, they are different. The symptoms of nitrogen deficiency begin with the lower old leaf, and the symptoms of sulfur deficiency start from the upper new leaf. For example, in the case of sulfur deficiency in potatoes, the upper leaves are generally yellowed, and brown spots appear on the leaves when they are severe.
The lack of sulfur in soil is due to the compositional problems of calcium phosphate and heavy superphosphate. Therefore, Xiaobian recommends that when planting sulfur-loving crops, ordinary calcium phosphate should be used, or alternatively, calcium phosphate should be used alternately. The method of superphosphate can reduce the occurrence of sulfur deficiency in soil.
Inner Mongolia Xuanda Food Co., Ltd. , https://www.xuandagroup.com