Fertilizer is very effective for the growth of crops. Through the resulting fertilizer effect equation, the recommended fertilization parameters such as the highest fertilization amount, the best fertilization amount, and the maximum profit rate fertilization amount in representative plots can be calculated. This method mainly serves as a macro-control function for rational distribution of fertilizers between regions, and is intuitive and accurate. Fertilizer application based on soil fertility is the science of modern agriculture. Soil nutrients were measured using a soil culture and differentiation instrument to provide basis for soil fertilization.
The method of soil fertigation for soil nutrient differentiation tester is called "soil determination and recommended fertilization". The core of the method is to determine the available nutrient content based on the recommended fertilization amount. The advantage is that once a set of methods and indicators are determined by field experiments, the applicable soil range can be calculated according to the type of soil and can be carried out year after year. Serving every plot, it functions as a micro-guidance for recommended fertilization. Its disadvantage lies in its semi-quantitative nature and non-intuitive nature. There are many ways to measure soil fertigation. The classic methods of soil fertigation include soil nutrient fertility index method, soil fertility index method, and target grain yield fertilization method. The nutritional diagnosis method of crops is also one of the recommended fertilization methods. Although it is still at a qualitative stage at present, it can still play a role in the recommended fertilization. The law is based on the method of plant nutrition chemistry. After determining the total fertilization amount of crops and the application of basal fertilizer by fertilizer effect function method or soil fertilization method, it is still necessary and advantageous to apply crop nutrient diagnosis method to determine whether some of the nutrients in the crop are adequate. Partition recommended fertilization method is a practical method suitable for China's national conditions. This method is a solution to the problem of fertilizer application and ratio in different regions, crops, and different yields. It is an effective way to popularize recommended fertilization techniques, fertilize fertility, increase fertilizer utilization, and increase yield. It is an important basis for the development of special fertilizer production. . The zoning recommended fertilization method is a method of subdividing the subregions of similar crop production potentials, nutrient use efficiency, and environmental effects, resulting from similar or consistent soil conditions, into administrative divisions, and recommending fertilization for the basic units of the management zoning, in a Within the zone, as a recommended fertilization zone.
Research and application were carried out in the district-level recommended fertilization. Based on the fuzzy set theory, based on the comprehensive evaluation of the land productivity in different ecological areas, the district recommended fertilization. In the township (town) district recommended fertilization is discussed. It is suggested to divide the balanced fertilization zoning according to the types of soil fertilization, agricultural production conditions, fertilization levels, and fertilizer rewards; and put forward the requirements for appropriate fertilization, main nutrient ratios, and requirements for applying trace fertilizers for the main crops in the subregion, and propose the total area of ​​various nutrients. The basic fertilization techniques that are compatible with the control standards, recommended fertilizer rates, and nutrient ratios. Soil fertility should be used as the basis for zoning. Generally, it is better to use the measured yield of the soil phytosanitary instrument as the zoning standard, and the measured value of soil can also be used as the standard for soil zoning. At present, no unified zoning principles and standards have been established in the country. Although the recommended fertilization zoning has made some progress, the feasibility of zoning recommended fertilization has not been reported by studying the spatial variability of soil nutrients in a wide range.
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