The soil testing formulation technology has become more and more familiar to the majority of farmers, but its real meaning is what we all know. Actually, soil testing and formula fertilization technology refers to the use of scientific instruments such as soil testing and fertilizer applicators, and based on the fertilizer and soil nutrient content needed in crop production, the most common nitrogen, phosphorus, potassium and other trace elements are proposed. The proportion of application, quantity, time, means, etc.
At present, the characteristics of the domestic scientific fertilization research and development are: the three systems of fertilizer effect function method, soil fertilization method and plant nutrient diagnosis method infiltrate each other, learn from each other, and strive to find the optimum parameters, the benefits of obvious optimization of fertilization methods. This development trend also pointed out the direction for future research on ginseng science fertilization.
Soil testing and fertilization techniques are used to determine the nutrient status of soil to determine soil nutrient supply capacity as the premise, followed by parameters such as target yield and fertilizer utilization to determine the economical and reasonable fertilization amount, fertilizer ratio, fertilization time, and fertilization method. It must follow the following basic principles:
Fertilizer Decrease Law; crops absorb nutrients in proportion; nutrients are equally important and not replace laws; minimum nutrient laws; factor comprehensive laws; based on decreasing fertilizer reward law, fertilizer production increases from increasing (fertilizer is insufficient) to decreasing eventually becomes negative Effect (overfertilization) in three phases.
The lack of fertilization can not fully exert the potential for yield increase; excessive fertilization leads to a reduction in production; only in the second phase can the highest point of average increase in yield be obtained. Therefore, it is unscientific to excessively increase the amount of fertilizer to seek unlimited production increase. According to the principle that nutrient elements are equally important not to replace laws, minimum nutrients, and crops to absorb nutrients in proportion, it is shown that excess or deficiency of any nutrient element will lead to imbalance of nutrient elements and affect the growth and development of crops.
Therefore, soil testing and fertilizer application must ensure that the proportion of nutrient elements is balanced. The high yield of crops is the result of a combination of many factors in the process of crop growth and development. Therefore, the soil testing and fertilizing techniques emphasize the comprehensive role of factors.
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