WEED MANAGEMENT TOWARDS IMPROVEMENT OF GROWTH AND YIELD OF SESAME VARIETIES

Abstract

An experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka during the period from March to July, 2014 to study the response weed control methods on the growth and yield of different sesame varieties. The experiment comprised of two factors viz. (1) variety and (2) weed management as three varieties (V 1 = BARI til- 3, V = BARI til - 4, V 3 = Lal til) and five weeding levels (W 1 = no weeding, W = one hand weeding at 20 days after sowing (DAS), W 3 2 = two hand wedding at 20 DAS and 40 DAS W = Pre emergence herbicide Sunup 480 SL (Glyphoset) @ 3.7 l ha -1 spraying at land preparation and W 5 = Post emergence herbicide, Release 9 EC (Phenoxprop-p-ethayel) @ 650 ml ha spraying at 15-20 days after germination (DAG) respectively that were laid out in split plot design. Results revealed that BARI til- 4 stood superior to others in respect of branches plant 1 -1 , dry matter content plant -1 , leaves plant -1 , capsules plant , 1000 seeds weight, seed yield, stover yield and harvest index. Among the weed management practices, the highest plant height, dry matter content plant and leaves plant -1 were obtained by the application of pre emergence herbicide at land preparation time (W ) while maximum result of yield contributing characters and yield parameter were obtained from two hand weeding treatment (W 4 ). In combination, the highest plant height (145.73cm) was observed in BARI til-3 with pre emergence herbicide treatment. Highest capsules plant -1 (85.00), seeds capsule -1 3 -1 2 4 , seeds capsule -1 (97.00), seed yield (1.73 t ha ) and harvest index (18.97%) were obtained from BARI til-4 with two hand weeding. The highest 1000 seeds weight (3.90 g) was obtained from BARI til-4 with the application of Sunup 480 SL at @ 3.7 l ha -1 land preparation time. The highest biological yield (9.89 t ha -1 ) and stover yield (8.43 t ha -1 ) were obtained from BARI til-3 with two hand weeding treatment. Economic analysis revealed that BARI til 4 with two hand weeding for weed control recorded maximum gross margin (TK 98,980 ha -1 ) with 2.60 benefit cost ratio. -1 -1 -