The symbol of sulfur is S. According to the current classification method, it belongs to the middle element. Sulfur exists in proteins, vitamins, and hormones, and it is a component of plant structure. The physiological function of sulfur is very important.
Plant roots mainly absorb sulfur from the soil in the form of sulfate anions. Plant leaves can also directly absorb a small amount of sulfur dioxide gas from the atmosphere.
Sulfur is a component of cystine, cysteine, and methionine. Cysteine ​​functions as a stabilizing protein and determines its configuration. Sulfur plays a role in a series of synthetic and metabolic processes such as photosynthesis. Sulfur promotes the formation of legume nodules. Onion, garlic's spicy taste and mustard's pungent odor are caused by sulfur-containing volatile compounds.
Although sulfur is not a component of chloroplasts, it is involved in the synthesis of chlorophyll. Therefore, sulfur-deficient plants have a pale green leaf color and, when severe, yellow-white leaves. Because sulfur does not move in plants, the symptoms of sulfur deficiency first appear in the top of the crop and shoots, and the leaves are evenly chlorotic. Similar to the symptoms of nitrogen deficiency, they are easily misdiagnosed. The difference between the two is that nitrogen deficiency and chlorosis first appear in the old leaves, and sulfur deficiency and loss of green first occurs in the new leaves.
Gramineae use sulfate more easily than legumes. Gramineae legume grasses absorb available sulfur more quickly than legumes unless the soil retains sufficient sulphur, otherwise legumes will be squeezed out of mixed grassland because rhizobia require sulphur for nitrogen fixation.
The cycle of sulfur involves the atmosphere-soil-plant-animal. The main sulfur-bearing minerals in rocks and soils are gypsum, Epsom salt, Glauber's salt, pyrite, chalcopyrite, cobaltite, and other minerals. They are decomposed by microorganisms in well-ventilated soil and release water-soluble sulfate. This is sulfur from the soil. A small amount of gaseous sulphur oxides or hydrogen sulfide gas is emitted during volcanic, hydrothermal and marshy processes; human combustion of coal, crude oil and other sulphurous substances discharges sulphur dioxide into the air, many of them brought back into the ground by rain, and acid rain occurs at high concentrations.
In the case of submerged under-water conditions in flooded soils, organic matter decomposes to produce hydrogen sulfide accumulation. If the soil contains low levels of iron, it can cause poisoning, such as falling rice.
Sulphate mobility in soil is weaker than nitrate, stronger than phosphate, and more easily lost.
People rarely mention sulphur fertilizer. This may be due to two reasons. First, industrial activities burn fossil fuels, discharge sulphurous gas, and return sulphur to the soil with rain. Second, many fertilizers contain sulphur, but However, it is considered to be other fertilizer varieties. For example, ammonium sulfate is classified as nitrogen fertilizer, superphosphate is classified as phosphate fertilizer, and potassium sulfate is classified as potassium fertilizer. With the pollution control, the application of high-content fertilizers, and the cultivation of high-yield varieties, it is more important that with the popularization of the concept of balanced fertilization, people will pay more attention to sulfur fertilizers.
When using sulfur as a sulfur fertilizer, it should be noted that this is an acidogenic fertilizer and is often used as an alkaline soil improver.
Ammonium thiosulfate and ammonium polysulfate are also acidogenic fertilizers.
The application of sulfur fertilizers should pay attention to soil aeration, and it is easy to form hydrogen sulfide under strong soil reducing conditions, which will cause poisoning to the root system. It is necessary to strengthen water management and improve ventilation.
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