Abstract:
A field experiment was conducted during the rainy (
Kharif) seasons of 2010 to 2012 in heavy black soils at Main Sorghum Research Station, Navsari Agricultural University, Surat (Gujarat), to evaluate the effect of integrated weed management in rainfed sorghum (
Sorghum bicolor L.) with pre and post emergence herbicides (Atrazine, pendimethaline and 2, 4-D) alone or combination of these herbicide followed by hand weeding and intercrop soybean as smoother crop. The maximum grain (3737 kg/ha) and straw (15258 kg/ha) yields were recorded with treatment T
2 (Three HW at 25, 50 and 75 DAS + IC at 50 DAS) pre-emergence application of atrazine 0.5 kg/ha + 1 HW at 35 DAS, which remained at par with treatments T
5 i.e. Atrazine @ 1.5 kg/ha as pre-emergence (3612 and 14495 kg/ha), respectively and followed by T
6 i.e. Atrazine @ 1.5 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (Grain yield 3448 and Stover yield 13794 kg/ha) on pooled basis. The maximum net returns (68786 Rs.
per ha) was realized under the treatment T
5 i.e. Atrazine @ 1.5 kg/ha as pre-emergence followed by treatments T
2 i.e. Three hand weeding at 25, 50 and 75 DAS and inter-culturing operation at 50 DAS (67579 Rs.
per ha)
fb T
6 i.e. Atrazine @ 1.5 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (65816 Rs.
per ha)
fb T
7 i.e. Pendimethaline @ 1.0 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (62235 Rs.
per ha). However, the maximum gross returns ( 97937 Rs. per ha) was recorded with treatment T
2 i.e. Three hand weeding at 25, 50 and 75 DAS and inter-culturing operation at 50 DAS followed by T
5 i.e. Atrazine @ 1.5 kg/ha as pre-emergence (94030 Rs. per ha)
fb T
6 i.e. Atrazine @ 1.5 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (89653 Rs.
per ha)
fb T
7 i.e. Pendimethaline @ 1.0 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (86041 Rs.
per ha). Whereas, the maximum B:C was recorded under the treatment T
6 i.e. Atrazine @ 1.5 kg/ha as PE (2.76)
fb T
5 i.e. Atrazine @ 1.5 kg/ha as pre-emergence (2.72)
fb T
7 i.e. Pendimethaline @ 1.0 kg/ha as pre-emergence + 2,4-D @ 1 kg/ha (amine form) at 50 DAS as post emergence (2.61).