[American Bull Fertilizer Group Reprinted] - How to Buy High-quality Compound Fertilizer
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First, according to the soil properties science selection of compound fertilizer on the slightly alkaline, organic matter content is low (the soil pH is generally about 8.0), the effective nitrogen and phosphorus lack of soil, generally should use acidic compound fertilizers, such as monoammonium phosphate or humic acid NPK fertilizer, N and P compound fertilizer is appropriate. However, alkaline compound fertilizers such as diammonium phosphate should be used for a small amount of red clay or acid brown loam soil.
Second, according to the crop species scientific selection of compound fertilizer general field crops use NPK fertilizer, high yield wheat fields should use NPK compound fertilizer; wheat, rice, millet and other dense plant crops, suitable for use with powdered compound fertilizer; For medium crops, such as corn, granular compound fertilizer should be used; vegetables, especially fruit and vegetables, root vegetables, and fruit trees, etc. need more economic crops. N, P and K fertilizers with higher potassium and lower nitrogen should be used.
Third, according to the nature of fertilizers, the use of compound fertilizer scientific compound fertilizers currently on the market a considerable part of the compound does not meet the national standard GB15063-94. National standards stipulate that the compound nutrient (compound fertilizer) is effective nutrient content, the total concentration of high concentrations of NPK is ≥ 40%, the content of low concentration of NPK is ≥ 25%, does not include trace elements and middle elements; water soluble phosphorus content ≥ 40%, the water molecule content is less than 5%; the particle size is 1-4.75 mm and so on. Therefore, in addition to looking at trademarks and nutrient content when purchasing compound fertilizers, it is also necessary to pay attention to manufacturers and origins. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Potassium chloride contains chlorine and should not be applied to bogey crops. Where no “S†symbol is on the compound fertilizer bag, the potash is potassium chloride. Avoid chlorine crops such as grapes, potatoes, tobacco, sugar beet etc. Do not use it. Be sure to use the “S†symbol on the fertilizer bag. Compound fertilizer, compound fertilizer consisting of potassium sulfate.
Fourth, according to the fertilization method Scientific use of compound fertilizer in order to improve the fertilizer effect of compound fertilizer, different application methods should be selected different formulations of compound fertilizer. For the application of basal fertilizer must use granular compound fertilizer, and the higher the hardness of the particles, the better, such as the highest hardness of treason, the longest fertilizer. And the use of compound fertilizer in the compound fertilizer composed of ammonium nitrogen, which will improve the utilization of nitrogen. For top dressing applications, powdered compound fertilizer should be used, and it should be noted that the content of water-soluble phosphorus in compound fertilizer should be greater than 40%, and nitrogen is the compound fertilizer consisting of NH4-N and NO3-N. should. The general use of humic acid compound fertilizer is better than topdressing.