Effect of nitrogen application on partitioning of biomass, seed yield and harvest index in contrasting genotypes of oilseed brassicas Kumar Anil, Singh D.P.1, Singh Bikram, Yashpal Regional Research Station, Chaudhary Charan Singh Haryana Agricultural University, Bawal, 123501 1 Present address: Department of Agronomy, CCS HAU, Hisar 125004
Abstract Five genotypes of Indian mustard [Brassica juncea (L.) Czernj. & Cosson], viz. ‘RH 30’, ‘RH 8814’, ‘GJM 9056’, ‘CS 52’ and ‘Kranti’, and 1 genotype of Swede rape (Brassica napus L.) cv. ‘GSH 1’ were grown to assess the effect of various nitrogen levels (0,40,60 and 80 kg N/ha) on dry-matter partitioning, seed yield and harvest index during the winter seasons of 1993–94 and 1994–95. Stem and leaf constituted the major part of plant biomass up to peak flowering (66 days after sowing), onwards and siliquae continued to increase their share to plant biomass irrespective of nitrogen levels and genotypes. Total dry matter increased significantly up to 60 kg/ha. For above-ground plant biomass, ‘RH 8814’ was significantly superior at 66, and 108 days after sowing and at harvest than ‘RH 30’, ‘GJM 9056’, ‘CS 52’, ‘GSH’ 1 and ‘Kranti. Seed yield increased significantly up to 80 kg/ha. There were non-significant differences in seed yield among Brassica juncea genotypes and all these were significantly superior to Brassica napus ‘GSH 1’. Harvest index increased with the increasing nitrogen levels and ‘RH 30’ genotype had the better harvest index than other genotypes. Top Keywords Brassicas, Partitioning, Genotypes. Top |