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A long-term field experiment was carried out in alluvial soil with conservation agriculture practices like Zero tillage, Permanent bed and Conventional tillage to see the impact on vertical distribution of DTPA-Zn and Organic carbon of soil under rice based cropping systems. After completion of 5th cycle of experiment (2016), soil samples were collected from each plot and analysis processes were executed. The results were revealed that vertical distribution of DTPA-Zn and Organic carbon content, decreased with increases of soil depth. Maximum DTPA-Zn (2.02 mg/kg) and Organic carbon content (0.61%) of soil was recorded in surface layer (0-15 cm depth) under the treatment Zero tillage which was statistically similar to permanent bed and it was decreased to 0.49 mg/kg and 0.17% respectively due to conventional tillage. Whereas, Rice-Lentil cropping system was also significantly restrict the downward movement of DTPA-Zn and Organic carbon content through the soil profile as compare to Rice-Wheat and Rime-Maize. The DTPA-Zn showed positive correlation with Organic carbon content, indicating that retention of crop residue and minimum disturbance of surface soil under conservation agriculture increases the organic matter content that provides chelating agents for complexation of native Zn. In conclusion, zero tillage and permanent bed practices significantly restrict the movement of DTPA-Zn and Organic carbon to the lower depth of soil as compare to conventional tillage. | Impact of conservation agriculture on vertical distribution of DTPA-Zinc and organic Carbon of soil
