Soil fertility comprehensive evaluation under continuous farming pattern on dry land base on eigenvector

The dry land on red soil is barren,and the improper farming may cause the soil fertility decline,even degradation.In China,cropping patterns on dry land are diversified.The effects of different cropping patterns on soil fertility are different.In order to study the influence of continuous cropping patterns on the soil fertility on the dry land with red soil,a five years field pilot trial with local traditional farming patterns and the conventional fertilization were carried out.Weighting index based on eigenvectors were adapted to evaluate for the soil fertility on red soil dry land under continuous cropping patterns.The results indicate that this model is able to reflect the data change tendency,and the soil fertility changing situation could be reflected appropriately,and this evaluation analysis method has certain scientificalness and correctness.Based on the resulted of the model,Chinese pear +(peanut-green manure-peanut) were the optimal cropping pattern in terms of the soil fertility,while the traditional pattern was the worst.These results were corroborated by the biomass and energy benefit analysis.