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Nutrient return:
The crop absorbs a lot of nutrients from the soil. It should be able to “return†the ability to support the land through fertilization. It is correct to return the doctrine as the basic principle of fertilization. It points out that the planting industry cannot conduct predatory operations. In general, if you have high output, you must have high input, otherwise it is difficult to do. At the same time, through the nutrient input of fertilizers, it is possible to change the biological cycle that was confined to agriculture in the past, thereby increasing soil fertility and yield. But from now on, it also has one-sided and inadequate areas. For example, emphasizing full return is often uneconomical and unnecessary. If you have already accumulated a lot of nutrients in the soil, you can return it for a little while or not. At present, in the fertilization in our country should still emphasize what the soil lacks, make up what; lack of much, how much. And in the nutrient cycle inside agriculture, nitrogen is the most easily lost nutrient, and returning nitrogen is the most important.
Minimum nutrients:
Sixteen nutrients are required for crop growth and development, but the lowest relative nutrient content in the soil is determined by the level of crop yield. We explain it in wooden barrels. The height of the bucket depends on the lowest plank. Crop yield is controlled by the nutrient with the least relative content in the soil, and the level of crop yield varies with the minimum amount of nutrient supplement. Therefore, if fertilization is targeted, we must seize key issues.
Decreasing returns:
This was originally a law in economics, reflecting the relationship between input and output under the same technical conditions. In previous trials of fertilizer use, it was also confirmed that crop yields increased with the increase in fertilizer use. However, the relationship between the two is not a straight line but a parabolic relationship. If there is a linear relationship between the amount of fertilizer applied and the yield, then the amount of fertilizer added to each additional unit of fertilizer should be equal, ie a = b = c = d = e. The higher the amount of fertilizer, the higher the yield. In fact, with the increase in the amount of fertilizer, after a certain amount of fertilizer is applied, the amount of fertilizer applied is increased by 1 unit, ie, a> b> c> d> e, and the amount of fertilizer applied is a parabola relationship. . As the conditions for agricultural production change little in the short term, the phenomenon of decreasing returns on fertilization deserves attention. Therefore, there is a suitable amount of fertilizer, it is not appropriate to apply the principle of excessive.
å› å Factor comprehensive action law:
The formation of crop yield is the result of a combination of various factors such as moisture, nutrients, light, temperature, and variety. First, there are interaction effects between different nutrients. Sometimes there may be no interactions or even negative interactions. However, the cooperation between different nutrients often has a positive interaction. Fertilizer and water (irrigation), fertilizers and varieties, fertilizers and planting density have interaction effects. The use of positive interactions between nutrients and nutrients (fertilizers) and other agricultural measures to give full play to the role of fertilizers is one of the important principles of economically sound fertilization. Especially in recent years, due to advances in agricultural science and technology, the minimum nutrients have often been compensated and balanced fertilization has been widely adopted. The further improvement of the fertilization effect depends on the positive interaction between fertilizer and other measures.
The basic principle of fertilization
Fertilizer is a material that provides the main functions of plant nutrients. The basic principles for defining fertilization include the following four points: