Study on stability and adaptability of seed and oil yield of colza varieties and hybrids in warm rain fed areas

Research studies and cultivation experiances on farmer fields during few years have been showed that colza planting was succesful in warm drylands and due to its benefits took in rotation with wheat in rain-fed conditions. To study yield stability and adaptability of double zero spring rapeseed varieties 11 spring rapeseed genotypes along with Hyola401 hybrid as check evaluated in Sarpol-e-zahab and Gachsaran in rainfed conditions during 2 years. Present study carried out in RCBD with 3 replications and each genotye planted in 5 rows in 4 metter length. Planting was done in end of october at Sarpol-e-zahab and middel of september at Gachsaran. Results showed that option500 and AGS3006 had the highest seed yield in first and second year in Sarpol-e-zahab, respectively and were higher than Hyola401(check). Shiralee and RG4403 had the highest seed yield in first and second year in Gachsaran, respectively and were higher than the check. Results of combined analysis showed non-significant differences between genotypes for seed yield but there were significant differences for genotype×year and genotype×year×location in 1% probability level. Seed yield stability and adaptability sudy by ranking method showed that AGS3006, Option500 and Shiralee had the best ranks 3, 3.75 and 4.5 with 1701.7, 1758 and 1771.5 kg/ha, respectively. Rank standard deviation of these genotypes were 2.16, 2.5 and 2.65 respectively. Mean seed yield and rank of Hyola401 (check) was 1695.1 Kg/ha and 6.25, respectively that followed 3 superior genotypes. In general, the results of present study showed that there is possibility of replacing Hyola401 hybrid with AGS3006, Option500 and Shiralee open pollinate varieties in Sarpol-e-zahab and Gachsaran.