Journal of Advances in Biology & Biotechnology

Nitrogen fertilisation in Kenaf helps to increase the vegetative growth, thereby increasing the fibre yield. Hence nitrogen use efficiency (NUE) is one of the key factor, which determines the ultimate yield of this crop. Keeping this point in view, an experiment was conducted during kharif seasons of 2020 and 2021 at Jute Research Station, Kendrapara (19⁰ 34’ N latitude and 86⁰30’ E longitudes) with an objective to study the NUE of Kenaf (var. JBM 71) under the combined application of organic manure and application of nitrogen in splits. The experiment was carried out in a split plot design, with treatments viz. with and without FYM application (@5t/ha) in the main plots and five different treatments  in sub plots : (i)control(N₁), (ii) 40 kg N in equal splits at three and six weeks after sowing(N₂), (iii)60 kg N in equal splits at three and six weeks after sowing (N₃),(iv)40 kg N in three splits as 10 kg N as basal,15 kg each at three and six week after sowing(N₄),(v)60 kg N in three equal splits (20kg  in each split) as basal, at  three and six weeks after sowing (N₅). Nitrogen use efficiency and uptake differed significantly under different treatment combinations. Maximum N uptake (54.6kg/ha) and utilization efficiency(30%) was recorded when the crop was treated with 5t/ha FYM and 60kg of N in three equal splits (N₅). In addition, performance of the crop in terms of biological parameter and fibre yield was also higher under the same treatment. Maximum fibre yield of 35.4q/ha was obtained under application of 60kg N/ha, partitioned into three equal splits preceded with application of FYM with B:C ratio of 1.95. For a given dose of fertiliser, better recovery of N and performance of the crop was obtained, under higher number of splits. Application of FYM had a positive impact on N uptake, recovery and use efficiency of kenaf.