Vertical distribution of DTPA- Manganese in PostHarvest Soil of Wheat as Influenced by Crop Residue and Residual starter Zinc

The present experiment is a part of a long-term experiment based on the effect of crop residue and residual starter zinc. This part of investigation “Vertical distribution of DTPA- Manganese in Post-Harvest Soil of Wheat as Influenced by Crop Residue and Residual starter Zinc”. Distribution of available iron in different soil depths as influenced by the graded level of crop residues and residual starter zinc under rice-wheat cropping system in calcareous soil are presented. The data on depth wise distribution of available Mn as influenced by long term application of crop residue and residual starter Zn under rice-wheat cropping system are depicted in Table 1 and illustrated in Fig 2. The available Mn content in surface soil (0-15 cm) varied from 4.28 to 4.89 mg kg-1 while that in 15 - 30, 30 - 60 and 60 - 90 cm depths ranged from 4.32 to 4.96, 4.27 to 4.86 and 4.18 to 4.76 mg kg-1, respectively. Increasing levels of crop residues significantly increased the DTPA-Mn content at all the depths viz. 0-15, 15-30, 30-60, 60-90 cm from 4.30 to 4.86,4.38 to 4.91, 4.28 to 4.82 and 4.19 to 4.73 mg kg-1 respectively. Residual Zn application significantly decreased the DTPA Mn content at 0.15, 15-30 and 30-60 cm depth from 4.58 to 4.55, 4.68 to 4.63 and 4.56 to 4.53 mg kg-1, respectively, however decrease was at par at 60-90 cm depth (4.46 to 4.44 mg kg- 1).