Singh, M. and Prabhukumar, S. and Sairam, C.V. and Kumar, A.
(2009)
Evaluation of different weed management practices in rainfed maize on farmers' fields.
Pakistan Journal of Weed Science Research , 15 (2-3).
pp. 183-189.
Abstract
On farm trials were conducted during Kharif 2006 and
2007 under rainfed condition at 5 locations in the farmers fields of Bijapur district in Karnataka, India to find out the most effective weed control measure in maize. The trials were laid out in a randomized complete block (RCB) design with three replications. Pre-emergence application of alachlor (2.0 kg ha-1), simazine (1.0 kg ha-1) and pendimethalin (1.0 kg ha-1) alone and in combination with one hand weeding at 30 days after sowing (DAS), two hand weedings at 20 and 40 DAS, smother crop (green gram and sunnhemp) and earthing-up were compared with weed free and weedy check treatments. Data revealed that two hand weedings at 20 and 40 DAS proved most effective followed by alachlor 2.0 kg ha-1 + hand weeding at 30 DAS. These treatments reduced the weed density and weed biomass significantly, which in turn increased yield compared with weedy check. The highest grain yield of 36.50 and 36.12 q ha-1 was recorded under weed free treatment during 2006 and 2007, respectively, which was at par with two hand weedings at 20 and 40 DAS. Maximum net return IRs 14450 (US$325) was obtained under weed free treatment, however, highest benefit: cost ratio (2.68) was recorded under
earthing-up and two hand weedings at 20 and 40 DAS
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