Weed management options for kharif planted maize (Zea mays L.)
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted during kharif season of 2018 in D-3 block of the Norman. E. Borlaug. Crop Research Centre of G.B.Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) with the objective to find the best weed control method among the application of herbicides alone, their tank mix application, sequential application and integration with cultural methods to control the complex
weed flora of kharif maize and to study its effect on the growth and yield of kharif maize and its complex weed flora. The experiment was laid out in a randomized block design with three replications and ten treatments viz., atrazine 1.0 kg/ha, tembotrione 120 g/ha, halosulfuron-methyl 67.5 g/ha, atrazine 1.0 kg/ha fb halosulfuron-methyl 54 g/ha, atrazine 800 g/ha fb halosulfuron-methyl 67.5 g/ha, tembotrione 120 g/ha + halosulfuron-methyl 54 g/ha, tembotrione 96 g/ha + halosulfuron-methyl 67.5 g/ha, atrazine 1.0 kg/ha fb one hand weeding at 25 DAS, weed free and weedy check. Hybrid maize variety NMH-589 (Suvarna) was sown on 27 June, 2018 and harvested on 9 October, 2018. The soil of the experimental field was sandy loam in texture, medium in organic carbon, medium in available phosphorus and potassium and low in available nitrogen and neutral in pH. Major weed species that infested the experimental field were Echinochloa colona, Digitaria sanguinalis, Dactyloctenium aegyptium among grasses, Celosia argentea, Trianthema monogyna, Commelina benghalensis among broad leaved weeds
and Cyperus rotundus among sedges. Pre-emergence application of atrazine at 1.0 kg/ha fb by one hand weeding at 25 DAS was found most effective treatment for the control of the complex weed flora of maize which was at par with tank in mix application of tembotrione 120 g and halosulfuron-methyl 54 g/ha at 3-4 leaf stage of the weeds. Pre-emergence application of atrazine at 1.0 kg/ha fb by one hand weeding at 25
DAS recorded highest yield, yield attributing characters, nutrient uptake by crop and B: C ratio which was at par with tank mix application of tembotrione 120 g and halosulfuron-methyl 54 g/ha at 3-4 leaf stage of the weeds. Pre-emergence application of atrazine at 1.0 kg/ha fb by one hand weeding at 25 DAS found best in all respect and it was comparable to tank mix application of tembotrione 120 g and halosulfuron-
methyl 54 g/ha at 3-4 leaf stage of weeds, hence can be used as an effective weed management strategy for controlling complex weed flora of maize.
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