Method for correcting graded index of soil nutrient

Abstract

The invention discloses a method for calibrating a ranking index of soil nutrients, which belongs to the field of agricultural science and technology. The method comprises the following steps: obtaining a preliminarily sketched ranking index of the soil nutrients; selecting representative farmland test points to perform farmland fertilization experiments; calculating the yield and the fractional yield of each farmland test point; comparing whether the rank of the soil nutrient content of each test point is consistent with the rank of the sketched soil nutrient according to a fractional yield method, if not, calibrating a ranking critical value between the two ranks related to the inconsistency; and calculating the ranking critical value after the calibration on the dividing basis that the farmland nutrient content data are adjacent to each other, the relative yield belongs to an adjacent ranking index, while the farmland test points of the two ranks which are inconsistent with the rank of the preliminarily sketched ranking index of the soil nutrients are used as calculating objects. The method can be applied to calibrating an existing ranking index of the soil nutrients, or combining with the formulation of a new index to obtain a new ranking index of the soil nutrients with a practical value.

Description

technical field [0001] The invention relates to a method for correcting soil nutrient classification indexes, belonging to the field of agricultural science and technology. Background technique [0002] Soil nutrient grading index, also known as soil nutrient abundance index, is mainly used to evaluate the supporting capacity of soil in the fertilization recommendation process. Simply put, for farmland with strong soil support capacity, less fertilizer can meet the needs of healthy growth of crops, and vice versa, more fertilizer (nutrients) is needed. [0003] Soil nutrient grading indicators generally use field crop fertilizer effect tests to analyze the correlation between soil nutrient measured values ​​and crop nutrient absorption. According to the contribution of soil nutrient content to crop yield, soil measured values ​​are divided into several grades. Each divided nutrient level is connected with the amount of crop fertilization to form a table of recommended fert...

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Problems solved by technology

However, formulating the soil nutrient classification index according to the above method requires a large number of field experiments. If the soil nutrient classification index for several areas is to be formulated, the amount of experiments will be larger, which will consume a lot of manpower, material resources and financial resources.

And the required cycle is also long. For example, the National Collaborative Group of Soil Nutrient Abundance Indicators spent 3 years conducting field experiments from 1982 to 1985, and some soil nutrient grading indicators were not published until 1988 (Huang Deming).

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