SEED YIELD AND OIL QUALITY OF RAPESEED AS iNFLUENCED BY DATE OF PLANTING

Abstract

An experiment was conducted at the Agrictilture Research Station, Bangladesh Agricultural Research Institute, l3urirhat, Rangpur during rahi -,Cason of 2004-05 to find out optimum planting time for the newly selected genotype I3CYS-03. There were five planting dates viz. October 20, October 30, November 10, November20 and November 30. Significant variations due to dillerent planting dates were observed in days to maturity, plant height, number of primary branches plant', seed yield plant 4, siliqua plant'. seeds siliqua'. 1000-seed weight, seed yield hi', biological yield ha 4and dry weight plant'. Results showed that the highest seed yield (1.86 t ha') was obtained from the second planting (October 30) and it was significantly different from the yields of all other dates of planting. Yield contributing characters were also found higher in the plants of second planting. The seed yield (1.47 t ha') of last planting was also satisfactory because of the prolong winter season prevails in the northern part of the country. Variations in respect of oil content in seed and fatty acid composition of oil were also obtained from different planting dates. Seeds obtained from the early plantings contained higher oil percentage in seed and lower concentration ofenicic acid in oil. Variations of oleic, linoleie and linolenic acids in oil also observed due to dillèmnt planting dates.