Three basic laws of scientific fertilization

(1) Nutrient returning theory. German chemist Liebig proposed this theory. The central content is that plants only ingest the mineral nutrients necessary for their daily life from the soil. Due to the continuous cultivation of crops, this uptake will inevitably lead to the consumption of mineral nutrients in the soil, and the long-term non-return of this part of the nutrients will make the soil It has become very poor, and even the grass is not born. Rotation can only slow down the infertility of nutrients in the soil and coordinate the use of existing nutrients in the soil, but it cannot completely solve the problem. In order to maintain soil fertility, the minerals that the plants have to take away from the soil must be returned to the soil by fertilization, otherwise it is predatory agricultural production.

(2) Minimum nutrient law: The minimum nutrient law is a basic law in crop nutrition. Its basic implication is that among the various essential nutrients in crops, the growth and yield of the crops is the nutrient with the lowest available nutrient content in the soil. If you ignore the limiting factor of the minimum nutrient content required for crops, other nutrients will be higher and it will be difficult to increase crop yields. Only by increasing the minimum nutrient content can the yield increase. The practice of agricultural production fully proves that the minimum nutrient law has important guiding significance for rational fertilization and promotion of agricultural development.

(3) Law of diminishing returns: The law of diminishing returns is an objective law that reflects the input and output of fertilizers. In the case of low crop yields, the relationship between fertilization and yield is often linear, but as the amount of fertilization continues to increase, there is a curvilinear relationship between fertilization and yield. Its characteristic is that under the same production conditions, with the increase of fertilization amount, the yield will increase, but the increase of crop yield will gradually decrease with the increase of fertilization amount, which is the law of diminishing returns. Moreover, when the crop yield reaches the highest level, increasing the amount of fertilizer application will not increase the yield, but will cause a decrease in production. This shows that in production practice, the more fertilizer is applied, the higher the yield. If you do not change other production conditions, blindly pursue high yields and blindly over-fertilize, you will inevitably be punished by the law of diminishing returns. Therefore, the application of this law has important guiding significance for overcoming blind fertilization and scientifically quantitative fertilization according to the highest yield that can be achieved under certain production conditions.

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