Three principles for selecting compound fertilizers

In recent years, compound fertilizers have gradually been accepted by the majority of farmer friends through trials, demonstrations, and promotion of various types of agricultural crops. First, because the nutrient content of fertilizer is relatively complete, the fertility is more lasting; the second is that there are formulas with different nutrient content, which can save the employment of multiple application of simple fertilizer; Third, many brands of compound fertilizer have good process traits and are easy to operate when applied; The fourth is to facilitate crop yield increase.

However, since the spring of this year, the fertilizer market has been slow to start, and compound fertilizers are no exception. In addition to price factors, farmers have doubts about the quality of compound fertilizers. From the surveys in various places and the situation in recent years, there are some problems with compound fertilizers produced by fertilizer production companies: Some compound fertilizers have insufficient nutrient content. For example, if a farmer buys a compound fertilizer with a nutrient content of 30%, the price It seems to be cheaper, but the actual content is only 15% after the inspection by the quality inspection department; some use composite fertilizer as a compound fertilizer and its nutrients have not been refined with the use of a combination of fertilizers; some agricultural product markets have many products and chaos Miscellaneous, making people dazzled, farmers can not choose; some of the nutrient content is very high, creating a fuzzy idea, in fact, the sum of a large number of elements and trace elements, in fact, a large proportion of elements accounted for very low; Some organic content is also counted as the total nutrient content, so that the total nutrient content is marked to 60% to 70%, as if higher than the content of inorganic compound fertilizer nutrients content is even higher, giving a false impression; some of the only standard nutrients The total content did not indicate the content of nitrogen, phosphorus and potassium; some of the manufacturing processes were rough, not that the water content was excessively high and that the water content was insufficient.

In view of the above-mentioned problems in the quality of compound fertilizers, peasant friends must be careful when purchasing, beware of being deceived, and this year's agricultural production will suffer losses.

First of all, we must carefully select the brand. Although there are many brands of compound fertilizers, such as imported ones, domestic ones, and nutrient content, organic compound fertilizers, bio-organic compound fertilizers and amino acid compound fertilizers, one of the major principles is the selection of branded products. First, look at the fertilizer announcement issued by the Provincial Department of Agriculture in the local agricultural sector. The approved fertilizer brand can be purchased with confidence; second, it depends on whether the fertilizer has a registered trademark; whether it has a registration number; Official invoice, save it well.

Second, we must clarify effective nutrients. According to relevant regulations, effective nutrients generally refer to the effective content of a large number of elements. Nitrogen refers to pure nitrogen, phosphorus refers to phosphorus pentoxide, and potassium refers to potassium oxide. The higher the content of these three nutrients, the higher the effective nutrient content. . When purchasing fertilizer, it is important to seriously consider how much of the effective content of a large number of elements is. Although some compound fertilizers are equipped with trace elements or organic matter, the amount of a large number of elements is correspondingly reduced. They have advantages in terms of comprehensive benefits and also have potential for yield increase.

Third, we must make good use of compound fertilizers. One depends on the length of the growing period of crops using compound fertilizer, the long growth period of the optional high-content compound fertilizer, the short growth period of the optional low-content compound fertilizer; Second, we must look at the types of crops used compound fertilizer, such as watermelon, horse 蓍, Tobacco and other use of chlorine-containing compound fertilizer; Third, according to the characteristics of crops with other fertilizers, such as green leafy vegetables are to apply nitrogen fertilizer, cotton, in particular, hybrid insect-resistant cotton to make up to potash.

Author: Zhang Yuhong (Xiaogan City, Hubei Province Agriculture Bureau senior agronomist)

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