اثر فواصل رديف كاشت بر درصد جذب تابش، عملكرد دانه و شاخص هاي رشد ارقام كلزا (Brassica napus L) در كشت دوم بعد از برنج

Effect of row spacing on light interception, grain yield and growth indices of rapeseed (Brassica napus L.) cultivars as second crop following rice

Effect of [0\v spacing on grain yield and variation j n growth indices of rapeseed (Brassicu napus L.) cultivars as second crop following rice was investigated in a paddy fields at Rice Research Institute of Iran (Rasht]. in 2003-2004 and 2004-2005 growing seasons. The experiment was conducted as a split plot in randomized complete block design with four replications. The main plots consisted of four rapeseed cultivars: Hyola308, RGS003, PF7U45/91(Sarigol) and Ilyola401 and the sub-plots were three row spacing: 20, 25 and 3U em at constant plant densities (40 pluut/m"}. Results showed rhat PF7045/91 (Sarigol ) ranked the first in relative growth rate (4.29 gig.IUGDD). crop growth rate (l).25g/m~.IOGDD), leaf mea index (1.89) and net assimilation rate (1 5:ʹ:9 ~/m2.1 UGDD), grains yield(2U43 kg/hal and oil content (34.19%.) was significantly different with the other cultivars. HyobJOH ranked the last among: cukivars. Row spacing of 20 em ranked the first in relative growth rate (4.2H g/g.lOGDD), crop growth rate (6.98 g/m1.IUGDD), leaf area index (1.706), net assimilation rate (IU.25 g/m1.10GDD), grains yield (1777 kg/hal and oil content (3J.35%) and were significantly different from other row spacings in LAI and NAR indices. Results also showed that PF7045/91 (Sarigol) ranked the first in light interception (LJ%) and HyolaJU8 ranked the last (75.5% and 615%, respectively). Row spacing of 20 em ranked the first in light interception (6HS%). Therefore, PF7045/91 (Sarigol) ranked the first in relative growth rare. crop growth rate, leaf area index. and net assimilation rate, grains yield. oil content and light interception. Row spacing of 20 em also ranked the (irst tor these rraits