How can I buy a good compound fertilizer?

Now how many fertilizer products, how to buy a good compound fertilizer? A few years ago, there was a saying in rural areas: "one depends on policy and the other depends on heaven, and the increase of grain production depends on diammonium." With the increase of grain production, the lack of potassium in soil has been shown, and now farmers are more likely to choose ternary or multi-component compound fertilizer. 1. The development trend of compound fertilizer there are three major trends in the development of compound fertilizer: first, multi-variety specialization, different crops have different special fertilizers, and special fertilizers are developed and produced according to the law and amount of fertilizer absorbed by crops. When choosing compound fertilizer, farmers should choose the corresponding special fertilizer for different crops. If it is not dedicated, it violates the law of crop fertilizer absorption, the yield-increasing potential of crops can not be brought into full play, and some nutrient elements are wasted at the same time. Second, multi-functional medicine, combining pesticides and chemical fertilizers together, eliminating the procedure of chemical seed dressing, one application can not only ensure the nutrients needed by crops, but also control underground pests and seedling pests, with multiple effects. Third, high concentration of long-term effect, with the development of agricultural production, high concentration and long-term effect of compound fertilizer is more and more popular among farmers. The application of this type of fertilizer reduces the amount of fertilizer, facilitates farming, eliminates topdressing, reduces labor, improves fertilizer utilization, saves labor, labor, time, quality and efficiency. Second, how to choose compound fertilizer 1. Look at the packaging qualified products double-layer packaging, moisture-proof. The appearance of the package has three certificate numbers: production license number, business license number, product quality registration certificate number; nitrogen, phosphorus, potassium content marked; manufacturer, address and so on. Open the outer package and have the product instructions in the bag. 2. Look at the physical properties of compound fertilizer products of good quality compound fertilizer, the particle size is uniform, non-caking, non-crushing. 3. To buy the compound fertilizer produced by regular manufacturers, the production equipment and production technology of regular manufacturers are relatively advanced, and the products produced are uniform. Balanced nutrients, stable quality, product formulations are developed by experts according to the characteristics of soil nutrients and crop fertilizer requirements, after long-term experiments, the formula is scientific and reasonable, targeted, complete nutrients, sufficient content. 4. To select the compound fertilizer suitable for local production, the compound fertilizer produced locally is mostly based on the soil nutrient content of this area and its surrounding areas, the law of crop fertilizer demand and fertilizer effect. Some farmers blindly buy compound fertilizer which is not suitable for local application, which not only affects the growth and development of crops, resulting in the waste of individual nutrient elements, but also affects the yield. 5. Avoid using "dichloride" compound fertilizer "dichloride" compound fertilizer year after year is a compound fertilizer produced with ammonium chloride and potassium chloride as raw materials, in which the content of chloride ion is high. Chloride ion is a trace element needed for crop growth, an appropriate amount can promote crop growth, excessive will cause fertilizer damage. If "dichloride" compound fertilizer is applied year after year, a large amount of chloride ion will be retained in the soil, "chlorine damage" will occur when crops are overabsorbed, and "salt damage" will occur in soil at the same time. Third, how to apply compound fertilizer is generally used as base fertilizer. The basic application methods include soil preparation before sowing, the first line of fertilizer, and the second line of fertilizer, that is, lateral deep fertilization. At present, the effect of deep application of compound fertilizer, especially long-term compound fertilizer, is the best. The position of deep application on the side should generally reach 5m / m 7 cm from the depth of the seed. The lateral deep application realizes the isolation of seed fertilizer and avoids burning seeds and seedlings. More application techniques of compound fertilizer