(1) Nutrient return theory. The German chemist Liebig proposed this theory. Its central content is that the plants only ingest the mineral nutrients necessary for their lives from the soil. Because of the continuous cultivation of the crops, this uptake will inevitably lead to the consumption of mineral nutrients in the soil. The long-term non-return of these nutrients will make the soil It becomes very barren and even grassy. Rolling down can only slow down the nutrients in the soil and coordinate the use of existing nutrients in the soil, but it does not completely solve the problem. In order to maintain the fertility of the soil, the minerals taken from the soil by the plants must be returned to the soil in the form of 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 many essential nutrients in crops, it is the nutrient with the least effective nutrient content in the soil that determines its growth and yield. If we ignore the limiting factor of the minimum nutrient content that crops need, 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 agricultural production practice fully proves that the minimum nutrient law has important guiding significance for rational fertilization and promotion of agricultural development.
(3) The law of diminishing returns: The law of diminishing returns reflects the objective law of fertilizer input and output. When the crop yield is low, the relationship between fertilization and yield is often a straight line, but as the fertilization amount continues to increase, the relationship between fertilization and yield becomes a curve. Its characteristic is that, under the same production conditions, with the increase of the amount of fertilizer, the yield increases, but the increase of the yield of the crop gradually decreases with the increase of the amount of fertilizer, that is, the law of diminishing returns. Moreover, when the crop yield reaches the maximum, increasing the amount of fertilization will not only increase production, but cause a decrease in production. This shows that in production practice, the more fertilized, the higher the yield. If you do not change other production conditions, blind pursuit of high yields and blind over-fertilization will inevitably be punished by the law of diminishing returns. Therefore, the application of this law to overcome blind fertilization, according to a certain production conditions may reach the highest yield, scientific quantitative fertilization has important guiding significance.
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