Influence of Parthenium and Chromolaena as Green Manure and their Compost on the Availability of Micronutrients in Typic Rhodustalf

摘要

Laboratory incubation experiment was conducted to study the impact of parthenium and chromolaena as green manure and their compost on the availability of micronutrients in paddy soils. Based on the content of total C of Parthenium and Chromolaena plant material applied at the rate of 0.5, 1.0 and 2.0 per cent level of organic carbon. Soil submergence increased the availability of Fe and Mn and decreased Zn and Cu. DTPA extractable Fe and Mn increases with the period of submergence up to 60 days and then decreases. DTPA Zn ranges with 0.99 to 2.36 mgkg~(-1) /whereas the DTPA exorable Cu ranges from 1.39 to 1.47 mgkg-'at 30 days after flooding among different treatments. Increasing the level of organic manure application increase the availability of micronutrients..