VALIDATION OF NEWLY DEVELOPED RAPESEED-MUSTARD VARIETIES/LINE IN HIGH LAND FOR DEVELOPMENT OF MUSTARD-FALLOW- T. AMAN PATTERN IN SYLHET

Abstract

The experiment was carried out at the farmer’s fields at Kamalbazar, South Surma, Sylhet district during November 2014 to March 2015 to select high yielding variety(s) of rapeseedmustard

suitable for cultivation in high land areas under partially irrigated conditions after harvest of T. Aman rice. The treatments included in the experiment were A. Irrigation levels viz. i. One irrigation at 25 DAS & ii. Two irrigation at 25 DAS and 55 DAS B. Rapeseed-mustard varieties viz. i. Tori-7, ii. BARI sarisha-13 (B. napus), iii. BARI sarisha-14 (B. campestris), iv. BARI sarisha-15 (B. campestris), v. BARI sarisha-16 (B. juncea), vi. Advanced line Nap-205 and vii. BINA sarisha-4 (B. napus). Results indicated that yield and yield contributing characters did not differ significantly due to irrigation levels. The results also revealed that yield and yield contributing characters differed significantly among the varieties. BARI sarisha-16 produced the tallest plant (127.7 cm) compared with the other varieties whereas BARI sharisa-14 produced the shortest plant (60.1 cm) which was statistically similar to Tori-7 (60.5 cm). The highest number (5.9) of branch plant -1 was produced by BARI sarisha-15 which was followed by BARI sarisha14 (5.4 branch plant -1 ) and the lowest (3.1 plant -1 by BARI sarisha-13. Length of siliqua, number -1 of siliqua plant , 1000-seed weight, seed yield, straw yield, biological yield and harvest index significantly differed among the varieties and advanced line. The variety BARI sarisha-16 produced the highest seed yield (993 kg ha , number of seed siliqua -1 ) which was significantly different from the others. BINA sarisha-4 produced the second highest seed yield (898 kg ha -1 ) while the lowest (645 kg ha -1 -1 ) was produced by the variety Tori-7. BARI sarisha-16 required the maximum days (89.3) for maturity but Tori-7 and BARI sarisha-14 had the minimum days (76.3 & 77.5 days respectively). There was no significant variation due to combined effect of variety and irrigation level on yield and yield attributes. Seed yield was positively correlated with plant height, siliqua plant -1 and 1000-seed weight. The newly developed rapeseed-mustard varieties/line had high seed yield and may be well fitted into the Mustard-Fallow-T. Aman rice cropping pattern.