In the past, when low-level phosphorus-passing calcium was used, the soil did not suffer from sulfur deficiency. However, in the case of high concentration of heavy superphosphate, soil sulfur deficiency occurred in some areas. Professor Chen Renshou of the College of Resources and Environmental Sciences at China Agricultural University said that to understand this issue, we must start with the composition of calcium phosphate and heavy calcium monophosphate.
The main component of calcium phosphate is phosphorus monocalcium phosphate, which contains 14% to 18% of phosphorus, and the secondary component is calcium sulfate, which weighs 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. The disadvantage of superphosphate is that the phosphorus content is low and there are many accessory components.
Heavy calcium phosphate is referred to as heavy calcium. Improvements have been made in the manufacturing method, so that impurities such as calcium sulfate are not contained in the fertilizer, so that the phosphorus content is greatly increased, and the phosphorus content is as high as 46% to 54%, which is a high concentration of phosphate fertilizer. Relative to the general use of phosphorus in calcium phosphate 18% to calculate the weight of calcium superphosphate, also known as double calcium superphosphate or three superphosphate. Therefore, heavy calcium phosphate is considered a premium in phosphate fertilizers. However, there are advantages and disadvantages. The problem of sulfur deficiency naturally occurs when calcium superphosphate is applied year after year.
How do farmers judge crop sulfur deficiency? Chen Renshou explained that the symptoms of crop sulfur deficiency are similar to those of nitrogen deficiency. The main feature is the chlorotic chlorosis of leaves, but from the subtle manifestations, there are differences. The symptoms of nitrogen deficiency begin with the lower old leaves, and the symptoms of sulfur deficiency start from the upper fresh leaves. For example, in the case of sulfur deficiency in potatoes, the upper leaves are generally yellowed. In severe cases, brown spots appear on the leaves.
Chen Lun-Shou points out that, in general, acid soils in the south are prone to sulfur deficiency, and sulfur-loving plants such as onions and garlic are prone to sulfur deficiency. Farmers should pay attention when applying fertilizers. It is recommended that Pu pass calcium phosphate when planting sulfur-loving crops. Because the use of calcium phosphate as a combination of dual nutrition role of phosphorus and sulfur; can also be used to pass the calcium phosphate and calcium superphosphate rotation application, so that the problem of sulfur deficiency can be solved.
Prof. Chen Lun-Shou also emphasized that the common calcium phosphate and calcium superphosphate are phosphate fertilizers and their properties are the same. Under other nutrient conditions, the fertilizer effect is the same. It is only necessary to pay attention to the dosage during application. The weight of superphosphate calcium is high, and the application amount is reduced by half compared with the amount of calcium phosphate used. In addition, general calcium phosphate and heavy superphosphate are suitable for all kinds of soils and various crops, but “heavy calcium†is best used as a raw material for compound fertilizers because of its high phosphorus content, and “super calcium†is more suitable for Hi sulfur crop application.
Organic materials: also known as organic polymer materials, generally by C, H, O and other elements of the relative molecular weight of more than 100,000 (of course, there are other elements, such as S or P, etc.) generally speaking, solubility (divided into two kinds of swelling and dissolution), thermoplasticity (high temperature into the kind of viscosity) And thermosetting (seemingly low temperature and return to solid state), strength characteristics (than carbon or steel and other materials made of general strength is about twice its strength), electrical insulation, general organic materials have rubber, cellulose, protein, starch, high polymer, etc.
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