1, consider the soil quality For soils with slightly alkaline, low organic matter content, and lack of available nitrogen and phosphorus, acid-nitrogen-phosphorus compound fertilizers, such as monoammonium phosphate or humic acid NPK fertilizer, and N-P compound fertilizer, should be used. However, for a few red clays or acid brown loams, chemical alkaline fertilizers such as diammonium phosphate should be used. 2. Consider crop varieties Normal field crops use nitrogen and phosphorus compound fertilizer, wheat or high yield fields should use NPK compound fertilizer; wheat, rice, millet and other close planting crops, suitable for application of powdered compound fertilizer; sparsely planted crops such as corn should be used Granular compound fertilizer, legume crops should use phosphorus and potassium compound fertilizer, and some cash crops should use ternary compound fertilizers that are compatible with local soil and crops; root crops (lotus, odoratum), corn, and late rice should be selected. Compound fertilizers with high potassium content. Relatively speaking, early rice, peanut, sesame, rapeseed, pepper and other crops should use compound fertilizer with higher phosphorus content; leafy vegetables should use compound fertilizer with higher nitrogen content; watermelon, strawberry, citrus, flue-cured tobacco, tea For crops such as grapes and other chlorine-repellent crops, compound fertilizers containing no chlorine or low chlorine content should be used. 3, mixed with single fertilizer The nutrients of the compound fertilizer are fixed, and it is necessary to better play its role in increasing production. It is also necessary to use single element fertilizer in combination to adjust the crop's need for different nutrients in different growth stages. Such as rice, corn, wheat and other crops, in the growth phase requires more nitrogen, if the choice of phosphorus and phosphorus, more phosphorus, you must first calculate the amount of phosphorus, insufficient nitrogen supplement with simple nitrogen fertilizer. If the calculated amount of nitrogen in crops is used first, then the amount of phosphorus will be too much, causing waste of fertilizer. 4, consider the application method For basal fertilizer, granular compound fertilizer must be used, and the higher the hardness of the particles, the better, in order to facilitate the extension of fertilizer efficiency; The compound fertilizer containing ammonium nitrogen, easily absorbed by the soil, not easily lost, suitable for a variety of soil and crops However, it is better to implement deep facilities to improve the utilization rate; for nitrate-nitrogen compound fertilizers, it is not absorbed by the soil and is easy to leaching with water, so it should not be applied to paddy fields, but suitable for dryland crops. For phosphorus and nitrogen less nitrogen and phosphorus compound fertilizer, can be used as a deep-fertilizer base, with nitrogen fertilizer as topdressing to supplement nitrogen deficiency. For higher-priced compound fertilizers such as potassium dihydrogen phosphate, the base fertilizer is generally not used, and it is best used as a soaking seed or top dressing. When using nitrogen, phosphorus and potassium ternary compound fertilizer as a seed fertilizer, it is necessary to consider that the nitrogen content should not be too high, otherwise it will easily cause burning and burning of seedlings. Portable Cable Reel,Garden Water Hose Reel,Retractable Garden Hose Reel,Wall Mounted Garden Hose Reel NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.hosereelqikai.com