As for nitrogen fertilizer, ammonium nitrogen fertilizer should be selected for rice, and ammonium chloride and urea are better. It is also effective to apply ammonium nitrogen fertilizer (such as ammonium bicarbonate, ammonium sulfate, ammonium chloride and urea) or nitrate nitrogen fertilizer (such as ammonium nitrate) to cereal crops such as corn and wheat.
Ammonium nitrogen fertilizer should also be used for potatoes and sweet potatoes. Ammonium nitrate can improve the quality of tobacco, in which ammonium nitrogen contributes to the combustibility of tobacco, while chlorine containing chemical fertilizers (such as ammonium chloride) reduce the combustibility of tobacco, which should be avoided.
Chemical alkaline or physiological alkaline nitrogen fertilizer should be selected for acidic soil. In saline alkali land area, ammonium chloride with more chloride ions should not be selected and applied. In alkaline soil, ammonium nitrogen fertilizer is easy to be absorbed and utilized by crops, but attention should be paid to prevent decomposition and volatilization.
More potassium fertilizer should be applied to melons and fruits in autumn
As for phosphorus fertilizer, legume crops (soybean and peanut), sugar crops (sugar beet and sugarcane), fiber crops (cotton), potato crops (potato and sweet potato), melons and fruit trees need more. Increasing phosphorus fertilizer has better fertilizer effect. In the plots with large amount of phosphorus fertilizer, it is not necessary to apply it year after year to avoid waste.
As for potassium fertilizer, tobacco, potato, sweet potato, sugar beet, watermelon and fruit trees all require a large amount of potassium, but these potassium loving crops avoid chlorine and should not be applied with potassium chloride. Potassium chloride should not be applied in saline alkali land for a long time. It can be used as base fertilizer and Topdressing on non chlorine taboo crops, but it should not be used as seed fertilizer. Potassium sulfate is suitable for all kinds of soil and crops. It can be used as base fertilizer, seed fertilizer, topdressing and topdressing outside the root.
As for sulfur fertilizer and sodium fertilizer, potato, soybean, peanut and rape are also sulfur loving crops, and the effect of using procalcium is better than that of "heavy calcium". Because "heavy calcium" does not contain calcium sulfate. Sugar beet is a sodium loving crop, and sodium nitrate is a good fertilizer for sugar beet. Ammonium chloride is forbidden for chlorine crops, but it is suitable for cotton, hemp and other crops, because chlorine can increase the toughness and tension of fiber.
