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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Nov 2020, 41 (6)                                     Back


nstantaneous and historical temperature effects on a-pinene

Weed dynamics, weed control efficiency and yield of aerobic rice as influenced by different weed management practices in eastern U.P.

 

R.K. Parihar1, V.K. Srivastava2, S. Kumar3*, V. Kumar4 and Sanjay-Swami5 

1Pusa Farm, Dr. Rajendra Prasad Central Agricultural University, Samastipur-848 125, India

2Department of Agronomy, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221 005, India

3Rabindra Nath Tagore Agricultural College, Birsa Agricultural University, Ranchi- 814 157, India

4Muga Silkworm Seed Organization, P-3 Unit, Rompara- 794 108, India

5School of Natural Resource Management, College of Post graduate Studies in Agricultural Sciences, Central Agricultural University, Umiam (Barapani)-793 103, India

*Corresponding Author Email : sksandeepkumarrao@gmail.com ?????????

Paper received: 13.06.2020 ?????? ???????????????????????????????????????Revised received: 03.10.2020 ??????????? ????????????????????????????????????????Accepted: 30.10.2020

 

Abstract

Aim: To identify the best sequence of pre- and post-emergence herbicides for achieving better weed control efficiency in aerobic rice.

Methodology: A field experiment was conducted in Randomized Block Design with eleven treatment combinations, replicated thrice.? The dominant weeds in field were C. dactylon, E. colona and E. crusgalli among grasses, C. rotundus, C. difformis and F. maliaceae among sedges and C. axillaris and P. niruri among broad-leaf weeds. Treatments consisting sequential application of two pre-emergence application [Pendimethalin (30 EC) @ 1.00 kg a.i. ha-1; Butachlor (50 EC) @ 1.5 kg a.i. ha-1] followed by three post emergence herbicides [Bispyribac-Na (10% SC) @ 35 g a.i. ha-1; 2, 4-D Na salt (80 WP) @ 0.06 kg a.i. ha-1; Almix (CME + MSM ) (20 WP) @ 40 g a.i. ha-1] and straw mulching @ 4 t ha-1;? Mechanical weeding at 20 and 45 DAS, weed free and unweeded check.?

Results: Among herbicidal treatments, pre-emergence application of pendimethalin at 3-4 DAS fb Bispyribac-Na at 15-20 DAS as post-emergence was most effective in minimizing weed density (4.81 m-2), biomass (6.20 g m-2), weed index (1.11%) and in enhancing the weed control efficiency (84.50%), grain yield (3.68 t ha-1) and straw yield (4.87 t ha-1) over rest of the treatments.      

Interpretation: Sequential application of pendimethalin at 3-4 DAS fb bispyribac-Na at 15-20 DAS is prominent in enhancing herbicide efficacy and reducing weed flora abundance resulting in higher weed control efficiency and grain yield due to their broad spectrum weed control.          

Key words: Aerobic rice, Grain yield, Weed biomass, Weed dynamics

 

 

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