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TY - JOUR AU - Prasannakumari, P. AU - Joseph, Mercykutty AU - Jessy, M.D. AU - Philip, Annie PY - 2014/04/11 Y2 - 2025/12/06 TI - Estimates of nitrogen fixation by legume cover crops grown in young rubber plantations using 15N isotope dilution technique JF - Journal of Plantation Crops JA - JPC VL - 42 IS - 2 SE - Research Articles DO - UR - https://www.updatepublishing.com/journal/index.php/JPC/article/view/5595 SP - 205-209 AB - <p>¹⁵N Isotope dilution technique has been used to estimate the amounts of N₂ fixed by leguminous cover crops, <em>Pueraria phaseoloides</em> and <em>Mucuna bracteata</em> grown in the inter-rows of immature rubber plantation, using <em>Ipomoea batatas</em> as the reference plant. The field experiment was conducted in the RRII farm during 2009, in an area planted with <em>Hevea brasiliensis</em>, clone RRII 105. The cover crops and the reference plant were established in separate blocks. For labeled urea application, micro-plots (1m x 1m) were established and ¹⁵N labeled urea, 5 atom % ¹⁵N excess, was applied @ 5 kg ha^-1. After 45 days, the above ground biomass from the micro-plots was harvested, weighed and sub-samples were collected for determination of dry matter accumulation, N content and ¹⁵N enrichment. Micro-plot experiments were conducted thrice during the active growth period of the legumes and the reference plant, <em>i.e</em>., during June-July, August-September and October-November. Estimates of N₂-fixation for <em>P. phaseoloides</em> ranged from 79.82 kg N ha^-1 during June-July to 39.32 kg N ha^-1 during October-November and averaged 58.1 kg N ha^-1. Corresponding estimates for <em>M. bracteata</em> ranged from 83.95 kg N ha^-1 during June-July to 57.03 kg N ha^-1 during October-Nov and averaged 69.7 kg N ha^-1. The study showed that both the cover crops fixed considerable quantities of atmospheric nitrogen and that N₂ fixation by <em>M. bracteata</em> was higher than that of <em>P. phaseoloides.</em></p> ER -