Full Research

Weed Management Strategies in SRI Cultivation and Their Impact on Water Uptake by Weeds

D. Pal, C. Majumder, R. K. Ghosh, D. Nongmaithem, S. Bera and S. Das

  • Page No:  1267 - 1271
  • Published online: 07 Dec 2016
  • DOI : HTTPS://DOI.ORG/10.23910/IJBSM/2016.7.6.1664a

  • Abstract
  •  paldebesh@rediffmail.com

A field experiment with rice under SRI was conducted in kharif season of 2010 and 2011 atInstructional Farm, Jaguli, BCKV, Nadia, West Bengal to study the effect of weed management practices on water uptake by weeds in a randomized block design with 7 treatments. viz., Unweeded Control; Weed free (four hand weedings); Monocot weed treatment; Dicot weed treatment; Pretilachlor 30.7 EC @ 500 g ha-1 as pre-emergence at 2 DAS followed by two wheel-hoeing at 20 and 40 DAS; Parthenium+Calotropis extract @ 5% v/v each as pre-emergence at 2 DAS followed by two hoeing at 20 and 40 DAS; Two hand weeding at 20 and 40 DAS. All treatments resulted in significant decrease in weed population and weed biomass over unweeded control. In case of third treatment monocot weed and in case of fourth treatment dicot weed population was more than unweeded control. The consumptive use (CU) was maximum (364.5 mm) in control treatment (first treatment) followed by monocot weed treatment, dicot weed treatment, hand weeding twice treatment, Parthenium+Calotropis extract @ 5% each, Pretilachlor with two hoeing and weed free treatment. On the other hand, water use efficiency (WUE) was maximum (12.15 kg ha-1 mm-1) in the weed free treatment closely followed by Pretilachlor with two hoeing and plant extract with two hoeing treatments. Highest grain yield (4.39 t ha-1) was recorded by weed free treatment. Again, Pretilachlor with two hoeing (yield 4.21 t ha-1) and plant extract with two hoeing treatments (yield 4.07 t ha-1) are also yield promising, economic and environmentally safe.

Keywords :   Plant extract, SRI, water, weed management


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