Author(s): S. SARIN, J. S. BINDHU, L. GIRIJADEVI, D. JACOB AND V. MINI

Abstract: A field experiment was conducted during 2019-20 in the summer rice fallows of Onattukara, Alapuzha, Kerala with the objectives to determine the best weed management option for the summer groundnut and to work out the economics of cultivation. RBD design was adopted with three replications. The treatments were T₁ -stale seed bed fb 1 hand weeding at 30 DAS; T₂ -imazethapyr + imazamox (PoE) @ 40 g ha-1 at 20 DAS; T₃ - imazethapyr + imazamox (PoE) @ 80 g ha-1 at 20 DAS; T₄ - imazethapyr (PoE) @ 37.5 g ha-1 at 20 DAS; T₅ - imazethapyr (PoE) @ 70 g ha^-1 at 20 DAS; T₆ -pendimethalin (PE) @ 1.0 kg ha-1; T₇ - pendimethalin (PE) @ 1.0 kg ha-1 fb hand weeding at 30 DAS; T₈ – Hand weeding at 20 DAS and 45 DAS; T₉ – unweeded check. The study revealed that weed management methods had influence on growth and productivity of groundnut. The prominent weed species of the experimental field was broadleaved weeds followed by grasses and sedges. Negative value of weed index (-9.94 %) in imazethapyr (PoE) @ 70 g ha^-1 at 20 DAS (T₅) indicated its superiority over the hand weeding treatment (T₈). The higher benefit cost ratio of 2.46 was obtained in T₅ followed by T₃ and T₁. It can be concluded that post emergence application of imazethapyr @ 70 g ha^-1 at 20 DAS (T₅) is the best weed management practice for summer groundnut in Onattukara tract considering the growth, yield and economics.

DOI: 10.22271/09746315.2021.v17.i1.1436

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