TY - JOUR AU - Prasannakumari, P AU - Jessy, M D AU - George, Sherin AU - Meti, Sankar PY - 2019/08/22 Y2 - 2024/03/29 TI - Assessment of nitrogen utilization from urea applied in rubber seedling nursery using 15N tracer technique JF - Journal of Plantation Crops JA - JPC VL - 41 IS - 2 SE - Research Articles DO - UR - https://updatepublishing.com/journal/index.php/JPC/article/view/5818 SP - 191-195 AB - <p>Nitrogen uptake from urea applied to rubber seedlings in the nursery was evaluated using <sup>15</sup>N tracer methodology, in micro-plots established in the field. Effect of varying rates of N on growth, and the relative contribution of soil N and fertilizer N towards total N uptake were studied. Influence of rate of N application on growth of seedlings was observed up to three months, and after six months, growth of plants was comparable for all the four N levels. The efficiency of N absorption by the plant, expressed as percentage N utilization ranged from 13.62 per cent at 125 kg N ha<sup>-1</sup> to 5.84 per cent at 500 kg N ha<sup>-1</sup>. The <sup>15</sup>N balance sheet averaged over the four levels of N shows that about 9.27 per cent of applied N was taken up by rubber seedlings, about 8.78 per cent remained in 0-60 cm depth of soil and about 81.95 per cent was unaccounted N.</p> ER -