Regarding the application amount of fertilizers, the formula recognized by China's authorities is: (Required Fertilizer Quantity of Crops - Fertilizer Supply Capacity of Soil) - Utilization Rate of Fertilizer = Fertilizer Application of Each Element in the Field.
When determining the amount of fertilizer required for a crop, the amount of various elements absorbed during the entire growth and development cycle under the premise of normal development of the guarantee must be taken into account. At the same time, those elements that are similar to catalysts and enzymes must also be considered; When soil fertility is available, on the basis of analysing the amount of various nutrients in the soil, the soil solution pH, soil moisture and nutrient retention (CEC), electrical conductivity (EC), and redox potential must be taken into account. EH), balance of anions and cations and salt bases, interactions between inorganic nutrients, and other factors to determine the actual fertility of the soil; when determining the fertilizer utilization, it must be taken into account that after the fertilizer is applied, the soil Solution pH. The important role of CE, CEC, EH, various nutrients, the balance of anions and cations and salt bases, the effects of parent material, microbes, organic matter, water, gas, light, and heat on the availability of fertilizers. Apply fertilizer. After the new balance is formed, the soil fertility capacity is actually used as the percentage of crop absorption as the fertilizer utilization rate.
To sum up, the scientific application of fertilizers should grasp the following principles: First, when considering fertilizing varieties, we must first know what elements are missing from the soil. Is the absolute amount of these elements really missing, or is there any reason to make use of these elements? The rate is limited. What kind of method can be used to eliminate these restrictions, so that we can determine what kind of fertilizer. Second, we must have an ecological awareness. We must work hard to increase the use of fertilizers to avoid increasing the cost and polluting the environment due to excessive fertilizers. Third, we must have a sense of land for cultivation and sustainable development. As long as we pay attention to the application of organic fertilizers, medium- and trace-element fertilizers, we constantly adjust the balance of soil pH, soil moisture, and nutrient retention (CEC), so that the interaction between inorganic nutrients changes from mutual antagonistic to Promote each other and improve the soil structure, so that the ecological environment of the soil is continuously developed from a lower-level balance to a higher-level balance spiral, and the land can be grown more fertilizer. (Liu Gong)
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