Method for evaluating soil fertility of purple paddy soil
A technology of soil fertility and evaluation method, which is applied in the direction of soil material testing, measuring devices, instruments, etc., can solve the problems of low actual productivity, difficulty in fully characterizing soil fertility status, and high soil fertility index, so as to achieve comprehensive selection and accurate and reliable evaluation results Effect
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[0031] Example
[0032] A method for evaluating the fertility of purple soil paddy field, including the steps:
[0033] 1. Selection of evaluation indicators
[0034] Soil quality indicators are the traits, functions or conditions for monitoring and evaluating soil health from the perspective of soil production potential and environmental management. The selection of evaluation indicators should follow the following principles: (1) The principle of combining comprehensive analysis with dominant factors; (2) The principle of stability, that is, first select the stable factors that often affect soil productivity; (3) Consider the science of existing data , Current and completeness, and current technical conditions. The present invention selects bulk density (BD), pH, organic matter (SOM), total nitrogen (TN), total phosphorus (TP), total potassium (TK), alkali hydrolyzable nitrogen (AN), and available phosphorus (AP) related to soil productivity , Available potassium (AK), cation ex...
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[0062] Experimental example
[0063] 1. Selection of evaluation indicators
[0064] In 2017, an experiment was carried out in Baili Village, Guanghan City, Sichuan Province. Field 1, Field 2, Field 3, and Field 4 were selected to collect soil samples of different cultivated layers (0-20 cm), and the soil bulk density (BD) ) And rice yield, the samples are brought back to the laboratory, and the soil pH, organic matter (SOM), total nitrogen (TN), total phosphorus (TP), total potassium (TK), alkali hydrolyzable nitrogen (AN), and available phosphorus (AP) are analyzed indoors. ), available potassium (AK), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) indicators.
[0065] 2. Determination of membership
[0066] According to the corresponding membership function formulas (1), (2) or (3), and the value of the turning point (Table 1), the membership values of various soil indicators in different fields can be calculated. The results are shown in Table 4.
[0067] Table ...
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