Compound fertilizer (complex fertilizer) is a kind of chemical fertilizer containing two or more than two kinds of nitrogen, phosphorus and potassium fertilizers. A compound fertilizer containing any two of the above elements is called a binary compound fertilizer; a fertilizer containing three elements at the same time 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 in the purchase of compound fertilizers by farmers' friends, specifically in the following aspects:
Misunderstanding of a granular fertilizer is compound fertilizer. In fact, in addition to compound fertilizers, there are large-particle urea, large particles of ammonium bicarbonate, nitrogen-containing formula fertilizer, large-particle ammonium sulfate and other single-element fertilizers, which must be determined by checking the active ingredients marked on the packaging bag.
Misunderstanding 2 will quickly dissolve is a good fertilizer. In general, nitrogen fertilizers are most easily dissolved, and phosphorus and potassium fertilizers dissolve slowly. Compound fertilizers with good granulation hardness dissolve faster, and granulation hardness is poor or powdered compound fertilizers dissolve slowly. Faster dissolution generally results in faster absorption, easier escape, and shorter fertility. Therefore, the type of fertilizer purchased should be determined according to the need of fertilization.
Misunderstanding three high-concentration compound fertilizer is better than low-concentration compound fertilizer. In fact, high-concentration compound fertilizers have the advantages of high nitrogen, phosphorus, and potassium content and are used in small quantities. However, in high-concentration compound fertilizers, the contents of nitrogen, phosphorus, and potassium are high, and the proportions of the corresponding elements such as calcium, magnesium, and sulfur are small, and if high-concentration compound fertilizers are used for a long time, calcium, magnesium, and sulfur will appear. Lack of symptoms.
Misunderstanding four-particle white compound fertilizer is a good fertilizer. In fact, the color of compound fertilizer (compound fertilizer) is not necessarily related to the quality of compound fertilizer. What really needs to be taken care of is the over-white compound fertilizer, which may be only a single-element fertilizer.
Misunderstanding five 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. Considering the price/performance ratio, many domestic compound fertilizers exceed it.
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