Compound fertilizer ( complex fertilizer ) is a chemical fertilizer containing two or more fertilizers of nitrogen, phosphorus and potassium. A compound fertilizer containing any two of the above elements is called a binary compound fertilizer; and a fertilizer containing three elements is called a ternary compound fertilizer. Compound fertilizer ( complex 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 among farmers' friends in the purchase of compound fertilizer, which have the following aspects:
The misunderstanding of a granular fertilizer is compound fertilizer. In fact, in addition to compound fertilizer, there are large-grain urea, large-particle ammonium bicarbonate, nitrogen-containing formula fertilizer, large-particle ammonium sulfate and other single-element fertilizers . When purchasing, you must look at the active ingredients marked on the packaging bag to determine.
Misunderstanding 2 will dissolve quickly and is a good fertilizer. In general, nitrogen fertilizer is the most soluble, phosphorus and potassium fertilizer dissolves slowly, and the compound fertilizer with good granulation hardness dissolves quickly, and the granulation hardness is poor or the powdery compound fertilizer dissolves slowly. Generally, the dissolution is fast, and it is easy to lose, and the fertilizer is short. Therefore, the type of fertilizer to be purchased should be determined according to the needs of fertilization.
Misunderstanding three high concentration compound fertilizer is better than low concentration compound fertilizer. In fact, the high-concentration compound fertilizer has the advantages of high nitrogen, phosphorus and potassium content and low consumption. However, in the high-concentration compound fertilizer, the content of nitrogen, phosphorus and potassium is high, and the proportion of the corresponding medium elements such as calcium, magnesium and sulfur is less. If the high-concentration compound fertilizer is used for a long time, calcium, magnesium and sulfur will appear. Lack of symptoms.
Misunderstanding four-grain white compound fertilizer is a good fertilizer. In fact, the color of compound fertilizer ( complex fertilizer ) and the quality of compound fertilizer are not necessarily related. What really needs to be watched is the compound fertilizer that is too white, maybe just a single element fertilizer.
Misunderstanding five imported compound fertilizer is better than domestic compound fertilizer. Imported compound fertilizers do have good fertilizers, such as imported from Norway and imported from Russia, but they are expensive. If you consider the price/performance ratio, many domestic compound fertilizers will exceed it.
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