Which brand of compound fertilizer is good, how to choose high-quality compound fertilizer

Considering soils with low alkalinity, low organic matter content and effective nitrogen and phosphorus deficiency, acid nitrogen and phosphorus compound fertilizers such as monoammonium phosphate or humic acid NPK fertilizers and nitrogen and phosphorus compound fertilizers should be used. . However, for a small number of red clay or acid brown loam, chemical alkaline compound fertilizers such as diammonium phosphate should be used. Considering crop varieties, generally use nitrogen and phosphorus compound fertilizers for field crops, and NPK ternary compound fertilizer for wheat fields or high-yield fields;

Wheat, rice, millet and other dense crops, suitable for powdery compound fertilizer; thin planted crops such as corn should use granular compound fertilizer, legume crops should use phosphorus and potassium compound fertilizer, economic crops should be selected with local soil, crops Compatible ternary compound fertilizer; root-stem crops (lian lotus, polygonatum), corn, late rice, etc. should use compound fertilizer with higher potassium content.

For early rice, peanut, sesame, rapeseed, pepper and other crops, compound fertilizer with higher phosphorus content should be used; leafy vegetables should use compound fertilizer with higher nitrogen content; watermelon, strawberry, citrus, flue-cured tobacco, tea and grapes should be used. For chlorine crops, compound fertilizers that do not contain chlorine or have low chlorine content should be used.

The nutrients of the compound fertilizer mixed with the single fertilizer are fixed. To better exert its yield increasing effect, it is also necessary to apply the elemental fertilizer to adjust the needs of different nutrients in the crops in different growth stages. For example, rice, corn, wheat and other crops require more nitrogen in the growing season. If diammonium phosphate with less nitrogen and less phosphorus is used, the amount of phosphorus should be calculated first, and the insufficient nitrogen should be supplemented with elemental nitrogen fertilizer. If you first meet the crop nitrogen calculations, then there will be too much phosphorus, causing waste of fertilizer.

Considering the application method such as base fertilizer, it is necessary to use granular compound fertilizer, and the higher the hardness of the particles, the better, in order to prolong the fertilizer effect; the compound fertilizer containing ammonium nitrogen is easily adsorbed by the soil, is not easy to be leached, and is suitable for various kinds. Soil and crops, but it is best to apply deeply to improve the utilization rate; for nitrate-nitrogen compound fertilizer, it is not adsorbed by soil and easily leached with water, so it is not suitable for application to paddy fields, but suitable for dryland crops.

Nitrogen and phosphorus compound fertilizers with less phosphorus and more nitrogen can be used as a base fertilizer and used as a top dressing to supplement nitrogen deficiency. For higher-priced compound fertilizers such as potassium dihydrogen phosphate, it is generally not used as a base fertilizer, and it is best used as a soaking seed or a top dressing. When using NPK ternary compound fertilizer as seed fertilizer, it should be considered that the nitrogen content should not be too high, otherwise it will easily cause burning and burning. (金联创)

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