Estimated extinction coefficient, radiation use efficiency and dry matter production coefficients rapeseed plant (Hyola 401) in Khuzestan

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