Effects of supplemental irrigation and nitrogen levels on seed yield and some morphophysiological traits of two drlyland wheat cultivars
Subject Areas : Journal of Plant Ecophysiologyحمزه Felehkari 1 , M.E. Ghobadi 2 , G. Mohammadi 3 , S.J. Honarmand 4 , M. Ghobadi 5
1 - دانشجوی دکتری دانشگاه رازی کرمانشاه
2 - استادیار دانشگاه رازی کرمانشاه
3 - دانشیار دانشگاه رازی کرمانشاه
4 - استادیار دانشگاه رازی کرمانشاه
5 - استادیار دانشگاه رازی کرمانشاه
Keywords: Yield, Chlorophyll, nitrogen, growth stage, flag leaf,
Abstract :
Irrigation and nutrition are two most important factors in increasing crop grain yield. In order to elevate the effects of supplemental irrigation and nitrogen levels on grain yield and morphophysiological traits of two wheat cultivars, an experiment was carried out at research Farm of Razi University in Kermanshah in 2008-2009. The experiment was conducted as split plots arranged in randomized complete blocks design with three replications. Treatments included supplemental irrigation [control (dryland) and irrigation during stem elongation, anthesis and grain filling] in main plots, nitrogen at 4 levels (0, 50, 100 and 150 kg ha-1) (N net from urea source) in sub plots and two wheat cultivars ("Sardari" and "Cross-Alborz") in sub-sub plots. Supplemental irrigation had higher flag leaf area and chlorophyll contents than dryland state. Application of 150 kg ha-1 N produced higher flag leaf area. Supplemental irrigation had higher flag leaf area at anthesis and grain filling stages. The highest of grain yield was obtained with supplemental irrigation at anthesis (3622 kg ha-1) and booting stages (3520 kg ha-1). Cross alborz cultivar (with 3378 kg ha-1) was better in grain yield than Sardari cultivar (2982 kg ha-1). Based on the results of this experiment, supplemental irrigation at Anthesis or stem elongation stage has greater impact on grain yield and physiological traits compared to the grain filling stage. Also, application of 50 kg N ha-1 had higher grain yield (3350 kg ha-1).
