تاثير آرايش كاشت بر راندمان مصرف نور و تجمع ماده خشك در كانوپي سه رقم كلزاي بهاره

The Effect of Planting Pattern on Radiation Use Efficiency and Accumulation of Dry Matter in Canopy of Three Spring Canola Cultivars

Radiation use efficiency (RUE) is a parameter that represents the ability of crop canopy to convert intercepted solar energy to dry matter and can vary with crop type and environment. The rate of radiation use efficiency depends on intercepted photosynthetically active radiation, which is in tum affected by planting pattern or rows cultivation. In order to evaluate the effect of planting pattern on radiation use efficiency and accumulation of dry matter on spring canola, an experiment was conducted in 20032004 at the College of Agriculture, Shahid Chamran University of Ahvaz. A split-plot design, with row spacing as main plots in four levels (15cm, 30cm, 50cm row spacing and 60 cm width ridges with 2 cultivated rows) and 3 cuItivars as sub-plots were used with three replications. Seventy plants per m2 were planted constantly in all plots. Results indicated that the effect of planting pattern and cultivar were significant on the radiation use efficiency and intercepted PAR, which are two important parameters in accumulation of dry matter. LAI and FIPARs were also affected by planting pattern and cultivar. Higher rate of accumulation of dry matter and RUE was obtained in 15cm row spacing. Also, between the cultivars, Hyola 401 had a higher rate of accumulation of dry matter and radiation use efficiency.