Magnesium sulphate heptahydrate contains two major nutrients, sulfur and magnesium, and the magnesium sulfate heptahydrate can not only increase the yield of crops, but also improve the taste of crop fruits. Because magnesium is a component of chlorophyll and pigment, it is a metal element in chlorophyll molecules. Magnesium promotes photosynthesis and promotes the formation of carbohydrates, proteins and fats. Magnesium is an activator of hundreds of enzymes and is also involved in the formation of enzymes that promote metabolism in crops. Magnesium can improve the disease resistance of crops and prevent the invasion of germs. Magnesium also promotes the formation of vitamin A and vitamin C in crops, thereby improving the quality of crops such as fruits and vegetables. Sulfur is a synthetic amino acid, protein, cellulose, and enzyme in crops. Simultaneous application of magnesium sulfate heptahydrate can also promote the absorption of silicon and phosphorus by crops.