effects of field conditions on emergence of oilseed rape seed lots grown in khorasan province

nineteen irrigated farms of canola from six cities of khorasan selected to assess the seedling emergence one month after sowing in 2009. soil texture of each farm determined using the hydrometer method. the results showed that weather conditions of sowing areas had no significant effect on emergence of oilseed rape. with increasing the temperature (within the range of 19.5 to 21.5 ˚c) emergence percentage was not increased significantly. rainfall also caused no significant effect on seedling emergence. the percentage of emergence in machine-sowing and hand-sowing were 38.4% and 28%, respectively. soils with loam silt, silt clay loam and loam texture had emergence of 27.2%, 31.2% and 47% respectively. it seems soil texture plays a great roll on the emergence of oilseed rape with epigeal seedlings.