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First, master the basic technology of compound fertilizer production, and have a guiding role in the selection of compound fertilizer. The compound fertilizer can be easily divided into potassium chloride type, potassium sulfate type and potassium nitrate type according to the composition process. Among them, potassium chloride type is the most widely used conventional compound fertilizer, and the cost is relatively low; potassium sulfate type is compound fertilizer used in avoiding chlorine or chlorine sensitive crops, with special purpose and moderate cost; potassium nitrate type is developed in recent years. High-grade compound fertilizer has no side effects on the soil. For example, potassium chloride type compound fertilizer can be used for rice, and potassium sulfate type compound fertilizer can be used for tea, citrus and vegetables. Potassium nitrate type compound fertilizer can be selected for citrus and tobacco.
Second, mastering the standard of high, medium and low concentration of compound fertilizer is a very necessary common sense for purchasing compound fertilizer. The intrinsic quality of compound fertilizer is determined by the production process. Another important indicator is the content of effective nutrients. The effective nutrients can only be marked by NPK (N+P2O5+K2O), and other nutrients are not used as nutrient labels (GB15063-94). standard). Some companies have classified S and other elements into total nutrients, which is not standardized and misleads farmers. Effective nutrient ≥ 40% is high concentration compound fertilizer, effective nutrients 30-40% for medium concentration, and effective nutrients 25-30% for low concentration. The minimum nutrient standard for three-element compound fertilizer is ≥25%, 20-25% can only produce two-element compound fertilizer, and less than 20% is not allowed to produce products. Therefore, understanding this concept is of positive significance for the purchase of compound fertilizer, you can know the grade of compound fertilizer as soon as you look at the packaging.
Third, the purchase of compound fertilizer can not only rely on the appearance, particle, color, solubility judgment, but also pay attention to the brand effect. Brands are the product of market competition, and excellent products have a recognized market effect. At present, in order to cater to the unscrupulous requirements of some dealers, some small enterprises in China are not able to impersonate the appearance of brand-name products or imported products with inferior goods, and they have seriously harmed the legitimate interests of farmers and should be vigilant. For example, the market often encounters sulfur-containing compound fertilizer for the sale of potassium sulfate compound fertilizer, which has deceived farmers. In fact, in the true sense, most compound fertilizers contain sulfur.
Fourth, the choice of compound fertilizer should also vary from place to place. For acidic soils and soils with low organic matter content, alkaline compound fertilizers or organic compound fertilizers should be used. Alkaline soils should be selected with acidic compound fertilizers, such as humic acid ternary compound fertilizers. Phosphorus-rich or potassium-rich soils can be used with strong targeting. Binary compound fertilizer. Potassium nitrate compound fertilizer can be used in the dry season. In the Meiji or rainy season, ammonium-type compound fertilizer can be used. The base fertilizer can be used as a compound fertilizer with coarse particles to promote the fertilizer efficiency. The compound fertilizer with small particles can be used for topdressing to facilitate the fertilizer efficiency.
In short, the choice or purchase of compound fertilizer should be economic, safe, efficient, and quality-enhancing as the goal, to achieve the best value.
Compound fertilizer is more effective than single-fertilizer fertilizer, but it has been recognized by farmers. However, how to purchase high-quality compound fertilizer to achieve low-cost and high-efficiency fertilization purposes is difficult for the farmers to master. In addition, the variety of compound fertilizers on the market is complicated and novel. The packaging is fancy, which increases the difficulty of recognition. To this end, the majority of farmers need to understand the common sense of using compound fertilizer.
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