Benifit evaluation of conservation tillage based on projection pursuit

In order to evaluate objectively the composite achievement of conservation tillage, a conservation tillage evaluation model based on projection pursuit was established. And the check results of the evaluation model indicated that the mean absolute error was 0.0393, and the average relative error was 1.75%. After optimizing the project direction, the multi-dimension data of the eight evaluation indices were synthesized to one dimension, and we could evaluate easily each item of test areas in Shanxi Province and Liaoning Province with the projection data. Results of the evaluation indicated that the order from good to bad of composite achievement of six samples was as follows: no-tillage with crushed stalk mulching in Shouyang test areas (B3), subsoiling with high stubble mulching in Shouyang test areas (B2), no-tillage with crushed stalk mulching in Linghai test areas (A3), no-tillage with high stubble mulching in Linghai test areas (A2), conventional tillage in Linghai test areas(A1), conventional tillage in Shouyang test areas (B1). And the results show that long term conservation tillage is practical and effective for promoting agricultural evaluation.