Identification of Soil Quality Indicators for New Alluvial in Rice Based Cropping Systems of Jorhat District, Assam

摘要

Rice based cropping system is one of the most important cropping system grown year after year in Jorhat district of Upper Brahmaputra Valley Zone of Assam. The present investigation was undertaken for soil quality assessment in new alluvial rice basedcropping systems. Through principal component analyses, critical soil quality indicators identified in New Alluvium Rice-Fallow Cultivated sequence were BD, CEC, TN, Av Fe, DHG, OC, Av B, EC, AvZn, Av. K2Oand Ex Ca. Among these, most sensitive indicatorof soil quality was BDand its less value contributed to 16.74% towards SQI.MDS indicators in New Alluvium Rice- Toria cultivated sequence were DHG, MWD, pH, Av Fe, BD and Min N and among them highest contribution of 35.04% towards SQI was from BD.Porosity, pH, MWD, CEC, Av B, MBC and Av P2Oswere MDS for New Alluvium Rice-Vegetable Cultivated sequence and porosity was the most sensitive indicator of soil quality. The contribution of soil porosity towards SQI was 33.45 percent.