What should we pay attention to when choosing compound fertilizer?

What should we pay attention to when choosing compound fertilizer? Please introduce compound fertilizer (compound fertilizer) is very popular among farmers because it contains many elements. Compound fertilizer (compound fertilizer) can be divided into high concentration (≥ 40%), medium concentration (≥ 30%) and low concentration (≥ 25%) compound fertilizer according to its total nutrient content. There are many misunderstandings in the selection and purchase of compound fertilizer by farmers, which include the following aspects. Misunderstanding that a granular fertilizer is compound fertilizer. In fact, in addition to compound fertilizer, there are large granular urea, large granular ammonium carbonate, nitrogen-containing formula fertilizer, large granular ammonium sulfate and other single element fertilizers, which can only be determined by looking at the effective ingredients marked on the package. Myth 2: what dissolves quickly is good fertilizer. Generally speaking, nitrogen fertilizer dissolves most easily, phosphorus and potassium fertilizer dissolves slowly, compound fertilizer with good granulation hardness dissolves faster, and compound fertilizer with poor granulation hardness or powder dissolves slowly. Dissolve fast generally absorb quickly, but also relatively easy to lose, fertilizer effect is short. Therefore, the type of fertilizer to be purchased should be determined according to the need of fertilization. Misunderstanding: high concentration compound fertilizer is better than low concentration compound fertilizer. In fact, the advantage of high concentration compound fertilizer is that the content of nitrogen, phosphorus and potassium is high and the dosage is low. However, in the high concentration compound fertilizer, the content of nitrogen, phosphorus and potassium is higher, the corresponding proportion of calcium, magnesium, sulfur and other medium elements is less, if the high concentration compound fertilizer is used for a long time, there will be symptoms of lack of calcium, magnesium and sulfur. Misunderstanding: four white compound fertilizers are good fertilizers. In fact, the color of compound fertilizer (compound fertilizer) is not necessarily related to the quality of compound fertilizer. What you really need to watch out for are the white compound fertilizers, which may only be single element fertilizers. Misunderstanding 5 imported compound fertilizer is better than domestic compound fertilizer. Imported compound fertilizers do have good fertilizers, such as those imported from Norway and Russia, but they are expensive. If the ratio of performance to price is taken into account, many domestic compound fertilizers exceed it. Click to get more compound fertilizer application techniques