Usually, the sulfur needed by the crop is close to that of phosphorus, and the sulfur content in the crop is generally about 0.2 to 2.0%. The contents of cruciferous crops are high, 0.89% of rapeseeds, 0.68% of radish rhizomes, and low levels of grass crops, such as 0.12 to 0.16% of rice and 0.16% of wheat. Under normal production, different crops require a large difference in sulfur demand. Crops that require more sulfur, such as rapeseed, radish, and sugar cane, require sulfur (S) of 65 to 100 kg per hectare, and require low-sulphur crops such as rice, Sesame, tobacco, and so on, only need 5~10kg of sulfur per hectare, general crop needs 20~30kg of sulfur (S) per hectare. Table: Output of different crops and sulphur requirement Crop product output t hm-2 Sulphur demand Skg hm- 2 Barley grain 5.0 20 Corn grain 5.0 25 Rice grain 6.0 10 Sorghum grain 4.0 15 Wheat grain 6.0 30 Millet grain 3.0 22 Broad bean seed solid 2.4 25 Peanut pod (fruit) 2.0 15 Rapeseed solid 3.0 65 Sesame seed 1.0 5 Soybean Seed Real 3.0 20 Sunflower Seed Real 3.0 15 Banana Fruit 40.0 15 Grape Fruit 20.0 30 Pineapple Fruit 50.0 20 Cabbage Head 70.0 80 Eggplant Fruit 60.0 10 Onion, Garlic Bulb 35.0 2 Tomato Fruit 50.0 30 Potato Tuber 40.0 20 Cassava Tuber 40.0 20 Beetroot 45.0 35 Radish Root 45.0 45 Tea Tea 2.5 25 Cigarette Dry Leaf 2.0 10 Sugar Cane Stem 100.0 60 Corn Silage 70.0 25 Red Clover Hay 7.0 20 Hay Dry 9.0 25 Sulfur on crop protein, oils, vitamins and certain Synthesis of the enzyme plays an important role; Rhizobium and sulfur can promote nitrogen fixation azotobacter. Some volatile substances with special odors also contain sulfur such as thiols in radish and onions, disulfides in onions, and polysulfides and sulfoxides in garlic oil and mustard oil. When the crop lacks sulfur, the leaves are pale green and yellow. In the case of nitrogen deficiency, the old leaves first turn yellow, and in the absence of sulfur, the young leaves of most crops are first yellow-green. Other symptoms of sulphur deficiency are dwarf plants, thin stems, reduced growth rates, and delayed maturation. Fruit trees are not easy to fully mature fruit, pale green. The symptoms of sulfur deficiency in different crops were different. After the rice was inserted into the sulfur-deficient plant, the rice returned to green and was delayed. The whole plant was significantly yellowed without any pods, and the roots were dark brown with less white roots. The young leaves of rapeseed are light green, gradually appearing purple-red squash blocks, curling up the edge of the leaves, and the stalks are thin and tend to be lignified. The pods are pale and the tips of the pods dry up. Soybeans in the early period of the new leaf chlorosis, late yellowing of the old leaves, there are brown spots, slender roots, thin plants, nodule dysplasia. The whole tobacco plant was pale green with old leaves scorching and the tip of the leaf curled downwards. The leaf surface appeared a protruding bubble point. The tea tree seedlings were yellow, called tea yellow, and the leaf texture became hard. Sulfur deficiency in plants, interference with nitrogen metabolism, and relative accumulation of nitrogen in the body, so the diagnosis of sulfur deficiency should include total sulfur and nitrogen-sulfur ratio. The critical value of available sulfur for general crop soil is 16 mg/kg, which varies from crop to crop, and Table 8 is different. Crop sulfur deficiency threshold. Sulphur nutrients are absorbed by the crop as SO42- in the soil solution. SO42- arrives at the root through diffusion and mass flow. When the SO42- content in the soil solution is above 5 mg/kg, virtually all crops can obtain the required sulfur through the mass flow. It was long ago that people knew that sulfur was an essential element of plant growth, but the more application of sulphur fertilizer was only for nearly 20 years. The main reasons for the current shortage of sulfur and increasing levels of sulfur deficiency are: 1. Crop yields increase, and more sulfur is removed from the soil. 2. Sulphur-containing fertilizers such as ammonium sulphate, calcium sulphate, and potassium sulphate are increasingly sulphur-free or sulphur-free urea, carbamine, ammonium phosphate, heavy superphosphate, calcium magnesium phosphate, potassium chloride, etc. replace. 3. The amount of organic fertilizer is reduced. The application of sulphur fertilizer in sulfur-deficient areas can increase crop production by 10-30%. In southern China, sulfur fertilizers have significant effects on rice, wheat, rape, milk vetch, peanut, sesame, sugar cane, tobacco, jute, rubber, litchi, and sweet potato. Sulphur fertilizer can improve the quality of crops and increase the nutrient value of food and feed. Sulphur fertilizer can increase the oil content of oil crops by 5-9%, and increase the protein, chlorophyll and vitamin content of crops. Sulfur fertilizer can improve the quality of vegetables, enhance crop drought resistance, cold resistance, and promote the competitiveness of leguminous components in mixed herbage. In addition, it also controls crop pests and diseases and promotes early maturation of crops.
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