Investigation the effects of cultivation season and genotypes on some of agronomic parameters of rape plant with delayed cultivation in Arak climate condition (Markazi province)

Abstract. This investigation was carried out to evaluate the effects of cultivation season and genotypes on some of agronomic parameters of rape). The experiment was conducted as split plots in completely randomized blockdesign with three replications at the Agricultural Research Station of Islamic Azad University of Arak in 2007. Main plots were planting dates at two levels (September 18thandOctober 15th respectively) and sub plots were considered 11 genotypes of winter canola (LICORD, OLARA, SUNDAY, MODERN, SLM046, OPERA, OKAPI, ELITE, R.COBRA, EBONIT and MILLENA) respectively. Main parameters such as plant height, number of pod on main branch, number of pod on sub branch, number of pod on whole plant, number of grain in pod, podlength, grainweight, grain yield and oil yield were measured. Mean comparison results showed that the highest cultivation date in mentioned parameters has been obtained on october18th. as well asthe most genotypes were obtained in parameters such asplant height, dry weightandtotal plantbiomass yield, respectively (91.15cm, 70.33g and105.5kg persquare meter) in ELITEgenotype. The maximum grain yield was in SLM046 genotype(4479kg), the maximum number of pod on main branch and, number of pod on sub branch, number of pod on plant were in MODERN and ROCOBRA genotypes (33.22, 56.67 and 74) respectively,the maximum number of grains in podwere in LICORD genotype (27). The least oil yield was relatedto LICORDGenotype (1.74 kg/hg). The interaction effects between cultivation date and genotype on mentioned parameters showed significant differences.