In order to estimate the extinction coefficient, radiation use efficiency and dry matter distribution coefficients of rapeseed plant (Hyola 401), at different planting dates and plant density a field experiment carried out in research station of Ramin Agricultural and N
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In order to estimate the extinction coefficient, radiation use efficiency and dry matter distribution coefficients of rapeseed plant (Hyola 401), at different planting dates and plant density a field experiment carried out in research station of Ramin Agricultural and Natural Resources University of Khouzestan in a factorial experiment based on randomized complete block design whit four replications in the 2011-2012. Treatments were three sowing dates (November 29 th, December 19 th and January 8 th) and four plant densities (50, 70, 90 and 110 plants per square meter). The extinction coefficient for canola in this trial was 0.39. Radiation use efficiency of canola growing on different dates obtained 0.92 g /MJ photosynthetically active radiation. the maximum dry matter production between treatment combinations showed significant differences (P<0/05), So that the highest and lowest dry matter were observed, in the first planting date and density of the fourth (1125/2 g.m2) and third planting date and density of the first (368 g.m2) respectively. Maximum crop growth rate in the linear phase of the treatment combination was significant (P<0/05). Maximum and minimum CGR were obtained in the first and fourth planting density (28/88 g.m-2.day-1) in the third planting date and density of the first (9/98 g.m-2.day-1) respectively. Also check the pod harvest index against day after flowering showed that increase HI Rapeseed plant is dependent to the longer duration of the linear phase in increase harvest index.
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