Impact of Irrigation and Nitrogen Levels on Dry Matter Partitioning and Yield of Late Sown Wheat

摘要

Dry matter partitioning, yield and HI of late sown wheat {Triticum aestivum L.) were investigated under different levels of irrigation and nitrogen. Experiment was carried out at the Research Farm of Chaudhary Charan Singh Haryana Agricultural University, Hisar during rabi seasons of 2010-11 and 2011-12. The experiment consisting of three irrigation levels viz., one irrigation at CRI, two irrigations at CRI and heading and four irrigations at CRI, late tillering, heading and milking in main plots and five nitrogen levels viz., control i. e. 0 kg N/ha, 50 kg N/ha, 100 kg N/ha, recommended dose of nitrogen i. e. 150 kg N/ha and 200 kg N/ha in sub-plots was laid out in strip plot design with four replications. Results of experiment revealed that percent contribution of different plant parts i. e. leaves, stem and earhead increased with the advancement of crop age except leaves and stem, which declined after 90 DAS during both the years. The per cent contribution of stem remained around 50% up to 90 DAS and then declined drastically till maturity. The increased level of irrigation increased the dry matter accumulation in leaves and earhead significantly at all the growth stages. Increased level of nitrogen dose increased the partitioning in favour of leaves at all the growth stages. Absolute dry matter accumulation in earhead at maturity increased significantly with increase in nitrogen dose up to 100 kg N/ha in 2010-11 and 15 0 kg N/ha during 2011-12. Dry matter accumulation increased significantly with increased levels of irrigation and nitrogen. The maximum grain yield and HI were obtained with four irrigations which was significantly higher than one and two irrigations. Increase in nitrogen dose increased the grain yield and HI significantly up to150 kg N/ha.