Symptoms of soybean deficiency: In the early stage, the new leaves are light yellow-green, but the old leaves are normal; in severe cases, the whole plant turns yellow, the leaves are small, and the internodes are short; the roots are elongated and the nodules are poorly developed. Soybean Sulfur Content According to Bansal (1983), the critical value of sulfur content in soybeans was 0.15% at 36 days of growth and 0.19% at 60 days of growth. The cutoff value of N:S in vivo is 16.5:1. The critical value of soil available sulfur in soybean fields: calcium chloride (0.15%) extraction method is 14 mg S / kg; monocalcium phosphate extraction method is 14 mg S / kg; Morgan extract method is 8 mg S / kg; The extraction method of ammonium acetate (0.5 mol/L) + acetic acid (0.25 mol/L) was 8 mg S/kg. Correcting the application of sulphur fertilizer to soybean sulphur deficiency not only increases yield, but also increases seed fat and protein content. Generally, the amount of sulfur fertilizer is 20-40 kg sulfur/ha. According to China's six soybean sulphur fertilizer test statistics, the increase rate is 6.4%-33%, with an average increase of 15%. Soybeans that apply sulphur fertilizer and urea in the Pacific High Islands increase production by 21%-45% compared to urea alone. (China Fertilizer Information Network)
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