Kamini Kumari, A.P. Dwivedi and Ankur Tripathi 2IISR, Lucknow, Uttar Pradesh, India
Abstract
The present experiment is a part of a long-term experiment based on the effect of crop residue and residualstarter zinc. This part of investigation ââ¬ÅVertical distribution of DTPA- Manganese in Post-Harvest Soil ofWheat as Influenced by Crop Residue and Residual starter Zincââ¬Â. Distribution of available iron in differentsoil depths as influenced by the graded level of crop residues and residual starter zinc under rice-wheatcropping system in calcareous soil are presented. The data on depth wise distribution of available Mn asinfluenced by long term application of crop residue and residual starter Zn under rice-wheat croppingsystem 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 increasedthe 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 to4.82 and 4.19 to 4.73 mg kg-1 respectively. Residual Zn application significantly decreased the DTPA Mncontent 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).