Studies on effect of herbicide mixtures and dormancy breakers for weed management in wheat (Triticum aestivum L.).
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Date
2022
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Department of Agronomy Institute of Agricultural Sciences Banaras Hindu University Varanasi
Abstract
The present investigation entitled “Studies on effect of herbicide mixtures and dormancy breakers for weed management in wheat (Triticum aestivum L.)” was conducted during the rabi season of 2018-19 and 2019-20 at the Agriculture Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh. The experiment was laid out in split plot design with three replications assigning five weed management treatments comprising of (H1) Clodinafop-propargyl 60 g a.i. ha-1 + Carfentrazone-ethyl 20 g a.i. ha-1, (H2) Sulfosulfuron 25 g a.i. ha -1 + Metsulfuron-methyl 4 g a.i. ha-1, (H3) Isoproturon 1000 g a.i. ha -1 + 2,4-D 500 g a.i. ha-1, (H4) Weedy check and (H5) 2-Hand Weeding (25 and 45 DAS) in main plot. Each main plot was further divided into four sub plots to accommodate sub plot treatments i.e. dormancy breakers [(D0) Control, (D1) Potassium nitrate (KNO3) @ 24 kg ha-1, (D2) Sodium azide (NaN3) @ 11.2 kg ha-1 and (D3) Gibberellic acid (GA3) @ 160 g ha-1]. Wheat variety HD-2967 was used for test crop. The treatments were allocated randomly to each plot. Urea, single super phosphate, muriate of potash and zinc sulphate monohydrate were used as a source of nitrogen, phosphorus, potassium and zinc. The crop was uniformly fertilized with 120 kg N, 60 kg P2O5, 60 kg K2O and 25 kg ZnSO4 ha-1 giving a full dose of phosphorus and potassium as basal and nitrogen and zinc applied as basal as well as top dressing. Other crop management practices were followed as per the recommendation of the area.
Among the herbicide mixtures, Sulfosulfuron 25 g a.i. ha -1 + Metsulfuron-methyl 4 g a.i. ha-1 had a significant influence on crop growth, yield attributes and yield, nutrient uptake, gross returns, net returns and B:C ratio of wheat with minimum weed infestation during both the years.
In case of dormancy breakers, control minimum weed density and weed dry biomass. However, Gibberellic acid (GA3) 160 g ha-1 exerted significantly higher crop growth, yield attributes and yield, nutrient uptake, during both the experimental years. Economically, higher gross returns was noted under (D3) Gibberellic acid (GA3) 160 g ha-1 treatment. However, higher net returns was recorded under (D2) Sodiun azide (NaN3) 11.2 Kg ha-1 over rest of the treatments. Whereas, significantly higher B: C ratio was exerted under (D0) control treatment.
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Herbicide mixtures