Evaluation of herbicides in black gram and their residual effect on succeeding mustard crop
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Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
Evaluation of herbicides in black gram and their residual effect on succeeding
mustard crop was studied at Research farm of Department of Agronomy, CCSHAU, Hisar
during kharif 2013 and Rabi 2013-14. Weed flora of the experimental field was dominated by
Trianthema portulacastrum (83%), Cyperus rotundus (15%) and Convolvulus arvensis (2%)
at 30 DAS. PRE application of imazethapyr + pendimethalin (RM) at 1000 g ha
-1
provided
excellent control (90%) of Trianthema portulacastrum up to 30 DAS. At 60 DAS, percent
control with this treatment decreased to 73% which was at par with two hoeings employed at
20 & 40 DAS and pendimethalin at 1000 g ha
-1
used as PRE. Post-emergence use of
imazethapyr + imazamox (RM) at 60-80 g ha
-1
exhibited 78-83 % control of weeds with slight
crop suppression which mitigated within 10-15 days after spray but resulting adverse effect
on crop growth and yield. Early post-emergence application of imazethapyr at 50, 60 and 70
g ha
-1
although caused mild injury to black gram in terms of yellowing of leaves and stunted
crop growth up to 30, but it diminished within two weeks. Maximum seed yield (903 kg ha
-1
)
of black gram was obtained with two hoeings at 20 & 40 DAS which was at par with
imazethapyr + pendimethalin (RM) at 1000 g ha
-1
and pendimethalin at 1000 g ha
-1
applied as
PRE. All herbicides, irrespective of their dose and time of application, did not cause any
injury to mustard planted as succeeding crop after harvest of black gram due to enhanced
microbial degradation of herbicides due to high rainfall (477 mm) during crop growing
season.
Description
Keywords
Weeds, Vegetables, Control methods, Crops, Yields, Herbicides, planting, Sowing, Cultivation, Land resources