Efficacy of imazethapyr + imazamox (Ready Mix) in cluster bean and its residual effect on mustard in two texturally different soils
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Date
2013
Authors
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Publisher
CCSHAU
Abstract
An experiment was carried out at two locations, CCS HAU Hisar and famer’s field, Kheri
Batter, Bhiwani. In the study, efficacy and phytotoxicity of different herbicide in cluster bean
during kharif of 2013 and their carryover effect on mustard crop was observed. PRE application
of pendimethalin + imazethapyr (Ready and tank mixture) and pendimethalin although provided
85-90 % control of weeds upto 30 DAS, but at 60 DAS, due to new emergence of weeds, visual
control of weeds reduced to 65 % in pendimethalin, but other two treatments provided 85%
weed control upto 60 DAS without any phytotoxic effect on cluster bean. At 60 DAS, highest
weed control (88%) was recorded under POE application of imazethapyr 100 g/ha fb
propaquizafop 62.5 g/ha which was at par with pendimethalin + imazethapyr (Ready and tank
mixture) and imazethapyr + imazamox (Odyssey) 70 g/ha fb propaquizafop 62.5 g/ha, but the
efficacy of Odyssey was lower under Hisar conditions due to heavy infestation of T.
portulacastrum as compared to other herbicidal treatments. No crop phytotoxicity was observed
under PRE applied herbicides. Only POE herbicides showed crop phytotoxicity and growth
suppression. At initial stages, higher rates of imazethapyr + imazamox and imazethapyr applied
POE resulted in chlorosis of leaves, suppression of growth and the plant height, though plants
recovered within 2 weeks and no injury was observed at later stages. Highest seed yield,
maximum net return and B-C ratio was obtained under POE imazethapyr 100 g/ha fb
propaquizafop 62.5 g/ha, and pendimethalin 0.5 kg + imazethapyr 50 g/ha (tank mixture) as PRE,
but both were statistically similar to each other and similar to pendimethalin + imazethapyr (RM)
1.0 kg/ha as PRE & imazethapyr + imazamox 70 g/ha fb propaquizafop 62.5 g/ha as POE at
location Kheri Batter, but at Hisar location pendimethalin + imazethapyr (ready and tank mixture)
provided maximum net return and B-C ratio. There was no carry over effect of different
herbicides used in cluster bean on succeeding mustard crop, probably due to microbial
degradation, higher temperature and leaching of herbicides because of high moisture during the
time of herbicide application and planting of mustard in 2013-14.
Description
Keywords
Weeds, Herbicides, Beans, Crops, Control methods, Yields, Planting, Sowing, Mustard, Developmental stages