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Studies on bioefficacy of imidazolinone herbicides in black gram and their residual effect on succeeding peal millet and sorghum crops

KrishiKosh

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Title Studies on bioefficacy of imidazolinone herbicides in black gram and their residual effect on succeeding peal millet and sorghum crops
 
Creator Kartik
 
Contributor Mehta, A.K.
 
Subject null
 
Description The present investigation entitled “Studies on bioefficacy of imidazolinone herbicides in black gram and their residual effect on succeeding pearl millet and sorghum crops” was studied at Research farm of Department of Agronomy, CCSHAU, Hisar during summer and kharif 2017. Major weed species infesting the experimental field were Dactyloctenium aegyptium (37%), Trianthema portulacastrum (34%), Cyperus rotundus (21%) and Digera arvensis (8%) at 30 DAS. Both at 30 & 60 DAS, PRE application of imazethapyr + pendimethalin (RM) at 1000 g ha-1 provided 100% control of Dactyloctenium aegyptium and Trianthema portulacastrum. Among the herbicide treatments at 30 DAS, PRE application of imazethapyr + pendimethalin (RM) at 1000 g ha-1 provided 90% control of weeds while at 60 DAS, 3-4 leaf stage application of imazethapyr + imazamox at 70 g ha-1 provided highest weed control efficiency (88%). Application of imazethapyr at 3-4 leaf stage and its ready mix combination with imazamox at 70 & 80 g ha-1 caused 16.3-30.3 % phyto-toxicity in forms of chlorosis and stunting of black gram which disappeared within two weeks after application but suppressed the yield and yield attributes of black gram. Maximum seed yield (912 kg ha-1) and yield attributes of black gram were obtained in weed free treatment which was statistically at par with two hoeings done at 20 & 40 DAS (895 kg ha-1) and PRE application of imazethapyr + pendimethalin (RM) at 1000 g ha-1 (878 kg ha-1). All herbicide treatments employed in black gram, irrespective of their dose and application time did not show any residual carryover effect on succeeding pearl millet and sorghum crops because of rapid microbial degradation of herbicides due to three flood irrigation applied to black gram and occurrence of 341 mm of rainfall between the time of application and sowing of succeeding pearl millet and sorghum crops.
 
Date 2018-08-30T05:47:46Z
2018-08-30T05:47:46Z
2018
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810070096
 
Language en
 
Format application/pdf
 
Publisher CCSHAU