STUDIES ON THE EFFICACY OF NEW HERBICIDES IN MANAGING WEEDS OF KODO MILLET (Paspalum scrobiculatum L.)
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Date
2019-08-23
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A field experiment was conducted during Kharif 2018 at Zonal Agricultural
Research Station, GKVK, Bengaluru. The experiment was laid out in RCBD with twelve
treatments replicated thrice. The experiment consisted of five herbicides oxadiargyl,
bensulfuron methyl + pretilachlor, pendimethalin, bispyribac sodium, ethoxysulfuron
applied alone or in combination in comparison to intercultivation and hand weeding at 20
and 40 DAS, weed free check and unweeded check treatments. Among different
herbicides, application of bensulfuron methyl 0.6 % G + pretilachlor 6.0 % G @ 165 g
a. i. ha-1 at 3 DAS fb bispyribac sodium 10 % SC @ 10 g a. i. ha-1 at 15 DAS recorded
lower number of sedge, grasses, broad leaved weeds and total weed density (2.48, 3.81,
2.55, and 4.69 m-2, respectively), lower weed dry weight (1.49, 1.33, 1.63 and 2.17 g m-2,
respectively), lower weed index (6.67 %) and higher weed control efficiency (94.63 %).
This treatment registered significantly higher grain (1958 kg ha-1) and straw yield (4063
kg ha-1) which also was attributed due to significantly higher plant height (69.62 cm),
number of tillers (33.67 plant-1), total dry weight (65.20 g plant-1) at harvest and higher
yield attributing characters like number of ear head (6.15), ear head length (12.15 cm),
weight of grains ear head-1 (1.18 g) and test weight (4.95 g). Further, it also resulted in
higher net returns (Rs.46,812 ha-1) and B:C ratio (3.06) compared weed free check
(Rs.46,959 ha-1 and 2.69, respectively) thereby reducing dependence on manual labour
for weeding under present labour scarce conditions.