   Reasonable purchase of fertilizers, we need to determine according to the characteristics of crops and the nature of the soil.
   First, nitrogen fertilizer
   It is suitable to use the nitrogen fertilizer according to the state, especially ammonium chloride and urea. The application of ammonia-based nitrogen fertilizers such as ammonium bicarbonate, ammonium sulfate, ammonium chloride, and urea, or nitrate-based nitrogen fertilizers such as ammonium nitrate, can also be effective in cereal crops such as corn and wheat. Potato and sweet potato are also more suitable for ammonia nitrogen fertilizer. Ammonium nitrate can improve the quality of tobacco, and ammonia nitrogen can help the combustion of tobacco. However, chemical fertilizers containing chlorine, such as ammonium chloride, reduce the flammability of tobacco and should be prevented from being used. For acidic soils, it is appropriate to use chemically alkaline or physiologically basic nitrogen fertilizers. In the saline-alkaline soil area, it is not appropriate to purchase and apply ammonium chloride containing more chlorine ions. In alkaline soil, although iron-based nitrogen fertilizer is easily absorbed and utilized by crops, we need to pay attention to avoid decomposition and volatilization of ammonium nitrogen.
   Second, phosphate fertilizer
   Legume crops such as soybeans, peanuts, sugar crops such as sugar beets, sugar cane, fiber crops such as cotton, potato crops such as potatoes, sweet potatoes, and melon and fruit crops require more phosphorus, and it is better to increase the application of phosphate fertilizer. Fertilizer effect. In the plots where the amount of phosphate fertilizer is relatively high, it is not necessary to apply phosphate fertilizer for several consecutive years to avoid waste.
   Third, potash
   Tobacco, sugar beets, potatoes, watermelons, sweet potatoes, fruit trees, etc. require a large amount of potassium, but these potassium-like crops are more resistant to chlorine, and it is not suitable to apply potassium chloride. Potassium chloride is also not suitable for long-term application on saline-alkali land. It can be used as base fertilizer and top dressing on non-chlorinated crops, but it is not suitable for application as seed fertilizer. Potassium sulphate is more suitable for various types of soils and crops, and can be used as base fertilizer, seed fertilizer, top dressing and top dressing.
   4. Sulfur and sodium fertilizer
Soybeans, potatoes, peanuts, and rapeseed are also crops that like sulfur. The use of calcium is better than "heavy calcium." Because "heavy calcium" does not contain calcium sulfate. Beets are also a favorite sodium crop, and sodium nitrate is a good fertilizer for sugar beets. Ammonium chloride avoids chlorine crops, but it is suitable for cotton, hemp and other crops, because chlorine can improve the toughness and tension of the fiber.
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