First, choose the right compound fertilizer based on local soil characteristics. For farmers who are located in alkaline soils in the north, acid compound fertilizers should generally be purchased; on the contrary, farmers with southern acid soils should use alkaline compound fertilizers; for soils with low organic matter content, generally Cooperate with the application of organic compound fertilizer or organic-inorganic compound fertilizer.
In addition, for the alkaline soil in the northwest, it is generally not suitable to select and apply the compound fertilizer produced by using 枸soluble phosphorus, potassium chloride and ammonium chloride as raw materials.
The second is to purchase compound fertilizer based on the variety of crops. For field crops, NPK ternary compound fertilizer should generally be used; for economic crops such as vegetables and fruit trees, especially root crops, more potassium should be used, and NPK ternary compound fertilizer with higher potassium content should be used; Avoid chlorine crops such as grapes, potatoes, tobacco, sugar beets, etc. It is not appropriate to apply compound fertilizer with high chloride ion content produced by using potassium chloride or ammonium chloride as raw materials.
The third is to purchase compound fertilizer based on the nature of fertilizer. Farmer friends should learn to understand and master a little common sense about fertilizers, so that they can find out when they buy fertilizer. For example: gb15063-2001 national standard stipulates that the effective nutrient content of compound fertilizer (composite fertilizer) is divided into high, medium and low: high concentration of NPK ≥40%, medium concentration NPK ≥30%, low concentration of nitrogen and phosphorus Potassium content ≥ 25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%. The nutrient content is different, the quantity applied and the technical requirements are different, of course, the price is different.
The fourth is to purchase compound fertilizer based on fertilization. In order to improve the fertilizer efficiency of the compound fertilizer, different dosage forms of compound fertilizer should be selected for different fertilization methods. For example, when making base fertilizer, it is necessary to purchase granular compound fertilizer, or to purchase compound fertilizer containing slow-release fertilizer, which has long fertilizer effect and is beneficial to increase nitrogen utilization rate. The humic acid compound fertilizer generally has better effect than the topdressing effect.
The fifth is to purchase compound fertilizer based on the principle of balanced fertilization. Farmers' friends should usually contact agricultural technicians to understand the soil characteristics and the fertilizer requirements of crops. It is best to combine with soil testing and formula fertilization. According to the principle of balanced crop nutrition, according to the reasonable results of soil testing results, what is missing? Achieve balanced supply of crop nutrients. Finally, it should be noted that the compound fertilizer is relatively fixed, must not be blindly selected and applied, nor can it be applied as a single fertilizer to avoid unnecessary loss and waste.
Nylon Flap Wheels
Surface Conditioning Nylon Flap Disc
Removing materials, edges, chamferings, burrs and rust, trimming and dressing of weld joints, and surface cleaning and finishing
The abrasive material structure is fine and uniform, and has good abrasion resistance, so as to ensure that the parts to be ground
have higher size, shape accuracy and finer surface roughness
Features:
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