Soil testing and formula fertilization is a complex system engineering. It is necessary to consider not only the characteristics of the soil, the needs of the crop, but also the carrying capacity of the environment, the quality of the crop, and the level of knowledge of the fertilizing method and the applicator. In balanced fertilization, not only efficient soil nutrient testing techniques and equipment are needed, but also fertilizer products that are compatible with them, and several are indispensable. China's high-grade phosphate rock resources are relatively small, and for a long time to come, low-concentration phosphate fertilizer will become the main force of Chinese plant phosphorus nutrition.
A large amount of high-concentration compound fertilizer is currently entering the market. However, due to the fixed nutrient ratio of the complex (mixed) fertilizer, it brings certain difficulty to the rational fertilization, and also causes the waste of effective nutrients of the fertilizer.
Increase the intensity of soil testing and fertilization, so that people have a clear understanding of the connotation of soil testing and formula fertilization, and carefully train farmers to understand the basic principles of plant nutrition, master the science of fertilizer technology, and truly lack what, make up What, what is missing, how much to make up. The prospect of simple low-concentration fertilizers is still very broad. At the same time, low-concentration fertilizers can make full use of the advantages of low-grade and high-grade phosphorus resources, and farmers in most areas have the advantage of applying calcium phosphate and calcium magnesium phosphate fertilizer habits. Take advantage of the nutrient effects of non-nutrients in your concentration of fertilizers, ie nutrients, silicon, magnesium and calcium, which are not included in the nutrient content, are also the advantages of low-concentration fertilizers.
In theory, the soil testing formula fertilization can be based on the nutrient content of the soil and the nutrient requirements of the crop, and the nutrients required for the crop can be reasonably applied. If the elemental fertilizer does not contain harmful components, regardless of the nutrient concentration, as long as the application amount is reasonable, it can meet the requirements of high yield and quality of the crop. It should be noted that the low concentration fertilizer has a low nutrient concentration, and the transportation and application costs will increase.
Source: Agricultural Resources Report, No. 4, 2006, A8
Laboratory of National Soil Testing and Fertilizing Center of Chinese Academy of Agricultural Sciences Bai Youlu
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