Author(s):

Manisha Uraon and GK Shrivastava

Abstract: The present investigation entitled “Sudies on efficacy of pre- mix penoxsulam + pendimethalin on weed growth, yield and economics of direct seeded rice” was carried out at Research cum Instructional Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur during kharif season of 2015. The soil of experimental field was sandy loam in texture (Inceptisols), neutral in pH and has 0.44 % organic carban, low nitrogen, medium phosphorus and high potassium content. Experiment was laid out in Randomized Block Design (RBD) with three replications. The treatments consisted of fourteen different weed management treatments viz, T₁ Penoxsulam + Pendimethalin (10+240 g/l) SE @ 20 + 480 g a.i. ha⁻¹, Tâ‚‚ Penoxsulam + Pendimethalin (10+240 g/l) SE @ 22.5 + 540 g a.i. ha⁻¹, T₃ Penoxsulam + Pendimethalin (10+240 g/l) SE @ 25 + 600 g a.i. ha⁻¹, Tâ‚„ Penoxsulam + Treatment Penoxsulam + Pendimethalin (10+240 g/l) SE @ 50 + 1200 g a.i. ha⁻¹ (Tâ‚„) fetched the maximum net return (Rs 46914.13 ha⁻¹) followed by Penoxsulam + Pendimethalin (10+240 g/l) SE @ 100 + 2400 g a.i. ha⁻¹ (Tâ‚…) (Rs 45753.13 ha⁻¹) and Penoxsulam 24% SC @ 25 g a.i. ha⁻¹ (T₈) (Rs 43905.13 ha⁻¹). While, the highest B:C ratio (2.05) was noted under the application of Penoxsulam 24% SC @ 25 g a.i. ha⁻¹ (T₈) followed by Penoxsulam + Pendimethalin (10+240 g/l) SE @ 50 + 1200 g a.i. ha⁻¹ (Tâ‚„) (2.00) and Hand weeding at 20 & 35 DAS (T₁₃) (1.57). (10+240 g/l) SE @ 50 + 1200 g a.i. ha⁻¹, Tâ‚… Penoxsulam + Pendimethalin (10+240 g/l) SE @ 100 + 2400 g a.i. ha⁻¹, T₆ Penoxsulam 24% SC 20 g a.i. ha⁻¹, T₇ Penoxsulam 24% SC @ 22.5 g a.i. ha⁻¹, T₈ Penoxsulam 24% SC @ 25 g a.i. ha⁻¹, T₉ Pendimethalin 30% EC @ 540 g a.i. ha⁻¹, T₁₀ Pendimethalin 30% EC @ 600 g a.i. ha⁻¹, T₁₁ Pendimethalin 30% EC @ 1000 g a.i. ha⁻¹, T₁₂ Pendimethalin 30% EC @ 1500 g a.i. ha⁻¹, T₁₃ hand weeding at 20 and 35 DAS and T₁₄ untreated check. Rice The rice variety MTU-1010 was tested under different combinations of herbicide and maintining the recommended nutrient (N:P:K) doses of 100:50:30 kg ha^-1. Rice seed was direct seeded on June 27^th, 2015 with a spacing of 20 x 10 cm and harvesting was done on October 29^th, 2015. Treatment Penoxsulam + Pendimethalin (10+240 g/l) SE @ 50 + 1200 g a.i. ha⁻¹ (Tâ‚„) fetched the maximum net return (Rs 46914.13 ha⁻¹) followed by Penoxsulam + Pendimethalin (10+240 g/l) SE @ 100 + 2400 g a.i. ha⁻¹ (Tâ‚…) (Rs 45753.13 ha⁻¹) and Penoxsulam 24% SC @ 25 g a.i. ha⁻¹ (T₈) (Rs 43905.13 ha⁻¹). While, the highest B:C ratio (2.05) was noted under the application of Penoxsulam 24% SC @ 25 g a.i. ha⁻¹ (T₈) followed by Penoxsulam + Pendimethalin (10+240 g/l) SE @ 50 + 1200 g a.i. ha⁻¹ (Tâ‚„) (2.00) and Hand weeding at 20 & 35 DAS (T₁₃) (1.57).

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