| 【Objective】The study was to objectively evaluate the acid soil fertility level improved by alkaline soil
conditioner, and to provide reference for the scientific improvement of acidic soil. 【Method】By selecting pakchoi as the
research object, the effects of different dosages of soil conditioner on acid soil fertility were evaluated comprehensively.
Based on the principal component analysis（PCA） and Norm values, and combined with analysis of correlation between
the soil fertility indicators, the highly sensitive indicators of acid soil fertility evaluation were selected as the key indicatorsto minimum data set（MDS） to represent soil fertility. And the key indicators were transformed into dimensionless data by
membership functions, the radar chart of which was used to reflect the overall level of fertility and the status of single indicator
of fertility. At last, the improved comprehensive soil fertility indicators were calculated by 2 exponential models.【Result】pH
value, exchangeable Ca2+, total nitrogen, exchangeable Mg2+ and organic matter were selected as indicators for the evaluation
of acid soil fertility. According to the radar chart and the exponential model, the application of soil conditioner could improve
the acidic soil fertility, and the degree of fertility improvement was controlled by the amount of conditioner. The recommended
amount of soil conditioner was 450 kg/hm2.【Conclusion】The degree of fertility improvement is controlled by the difference
of pH and exchangeable Mg2+ caused by different dosages of the soil conditioner. Soil fertility is the decisive factor for pakchoi
yield, and the improvement of single fertility indicator can improve the yield to a certain extent, however, it cannot significantly
increase the yield. Therefore, the evaluation on effects of soil conditioner on acid soil fertility should refer to the comprehensive
fertility level. |
