Agricultural gypsum is both a fertilizer and a soil amendment. The main component of gypsum is calcium sulphate, which contains both calcium and sulphur. The 17 nutrients needed for crops contain calcium and sulphur, so it is also a fertilizer. Since the sources of calcium and sulfur in the soil are extensive, the relative amount is also higher than other nutrients. In general, gypsum cannot be applied as a fertilizer alone. In the high-yield areas in the south, the crops absorb more calcium and sulfur, and the supplements are less. The application of gypsum also has an effect of increasing yield.
   The main use of gypsum is as a soil amendment for the improvement of alkaline earth. Alkaline soil is scattered in semi-arid areas such as northeastern and northwestern China. It is characterized by sodium carbonate and sodium bicarbonate in soil solution and exchangeable sodium in soil colloid. Therefore, the soil has a strong alkaline reaction and the PH can reach above 9 . The soil is sticky and poorly ventilated, which seriously affects crop growth and development. The reason why gypsum improves alkaline soil is that the main component of gypsum is calcium sulfate, which can react with sodium carbonate and sodium bicarbonate in soil solution, and sodium sulfate is easily soluble in water. It can be washed by irrigation and washed with water. In order to eliminate the alkalinity of the ploughed soil and achieve the purpose of improving the soil.
(Source: Liuku town of Yunnan Agricultural service centers: Shi Shuzhen)
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