The role of sulfur fertilizers is important

In the past a long period of time, growers mainly increased the effect of nitrogen, phosphorus, and potassium fertilizers on the yield increase of crops, and the application of sulfur fertilizers was far from paying attention. However, in regions with different levels of sulfur deficiency in the world, the amount of sulfur applied has increased exponentially. The application of sulphur fertilizer in sulfur-deficient areas can generally increase crop yields by 15% to 20% and improve crop quality. If sulfur is applied to tobacco fields, not only the yield but also the quality of flue-cured tobacco is greatly improved; after the application of sulfur fertilizers such as rapeseed, early rice, pasture, and leguminous crops, the yield also increases significantly. Tests have shown that soy, peanut, sweet potato and other crops produce significantly more sulfur, generally more than 10%.

The lack of sulfur in crops is due to the lack of sulfur in the soil itself. The proportion of nitrogen and sulfur required for normal growth of crops is as large as 14:1. With the large amount of nitrogen fertilizer application, different degrees of sulfur deficiency will occur. Second, with the increase in multiple cropping index and yield per unit area, more and more sulfur is taken from the soil by crops. At present, chemical fertilizers are continuously pursuing high concentrations. In particular, most manufacturers use urea instead of ammonium sulfate, ammonium phosphate instead of superphosphate, and potassium chloride instead of potassium sulfate. Fertilizers containing sulfur are increasingly reduced. The third is heavy calcium instead of calcium sulfate. In the past, when low concentrations of calcium superphosphate (calcium superphosphate) were used, there was no problem of sulfur deficiency in the soil, because the main component of normal calcium was monocalcium phosphate and the accessory component was calcium sulfate. Therefore, calcium sulphate can not only provide phosphorus nutrition for crops, but also make crops get sulphur nutrition. In some places, heavy calcium superphosphate is applied year-round. This fertilizer has been improved in its manufacturing method, so that the fertilizer does not contain impurities such as calcium sulfate, which greatly increases the content of phosphorus, but there is a problem of sulfur deficiency.

At present, sulfur fertilizers suitable for crop application include sulfur powder, superphosphate, potassium sulfate, ammonium sulfate and gypsum powder. Due to different types of crops and different types of soils, the amount of sulfur fertilizer applied, application methods, and fertilization time are different, and the amount of application of sulfur fertilizer is generally more than that of application and acupoint application; water-soluble fertilizer (such as sulphate-type sulfur fertilizer) can be used as base fertilizer, Topdressing and seed fertilizers; non-water soluble fertilizers (such as sulfur-based sulfur fertilizers) are generally used as base fertilizers.

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