Formula fertilization is based on the theory of nutrient return theory, minimum nutrient law, equal importance law, irreplaceable law, and fertilizer regression law. The relationship between soil, crop and fertilizer is followed by fertilizer and comprehensive agricultural technology. Guiding Principles Predetermination of the variety, quantity, proportion of fertilization and the corresponding scientific fertilization techniques are important measures to achieve high yield, high quality, high efficiency, soil fertility, increase fertilizer utilization and protect the ecological environment. Formula fertilization must determine the fertilization method according to the crop fertilizer requirements, soil fertility performance and fertilizer effect.
The first is to know what nutrients are needed for crop growth and how much is needed. The second is to understand how much nutrients can be supplied to the soil, which needs to be determined by analysis and analysis of soil nutrients. The third is to understand how much fertilizer applied to the soil can be absorbed by the crop.
In general, the nutrients needed for crops are composed of soil supply and fertilization. The total amount of nutrients needed for crop growth minus the amount that the soil can provide is the amount of nutrients that need to be fertilized. Formulating fertilization must rely on scientific means to understand the conditions of crops, soil and fertilizers, as we used to say, “watching the sky, seeing the land, and seeing the cropsâ€.
(Liu Haifeng)
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