WEED MANAGEMENT IN BLACKGRAM BY IMAZETHAPYR AND ITS EFFECT ON SUCCEEDING MUSTARD
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Date
2019
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Birsa Agricultural University, Ranchi
Abstract
Blackgram is one of the important pulse crops grown in India as it contributes 24 percent of total kharif
pulse production. In India, it is grown in about 3.62 million ha with an average productivity of 537 kg/ha against
world average productivity 744 kg/ha. In Jharkhand, it is grown in about 0.19 million ha with an average
productivity of 625 kg/ha. The yield loss due to weeds in blackgram is 27 to 90%. Chemical methods of weed
control are better option as manual weeding is not only tedious but also costly and many times laborers are not
available at peak time of requirement. Blackgram being a short duration crop leaves ample option for taking many
suitable succeeding winter crops. Judicious use of new herbicides with its proper dose, method and time of
application has to be taken care of with view that not only weeds in blackgram are controlled effectively but also
should not leave residual toxic effect on succeeding crops. Hence keeping this in view an experiment was
conducted at Birsa Agricultural University, Ranchi, Jharkhand during rainy and winter seasons of 2014-2015 and
2015-2016. The experimental soil was sandy-loam in texture with low organic carbon (3.4 g/kg), moderately
acidic (pH 5.6) in nature, low available nitrogen (189.00 kg/ha), medium phosphorus (21 kg/ha) and medium
potassium (155 kg/ha) content. The experiment was laid out in a RBD with 16 treatments i.e. Imazthapyr
50g/haPRE (T1), Imazthapyr 70g/haPRE (T2), Imazthapyr 80g/haPRE (T3), Imazthapyr 50g/ha POE (T4),
Imazthapyr 70g/haPOE (T5), Imazethapyr 80g/haPOE (T6), Imazethapyr.+Imazemox (RM)50g/haPRE(T7),
Imazethapyr.+Imazemox(RM) 70g/haPRE (T8), Imazethapyr.+Imazemox(RM) 80g/haPRE (T9),
Imazethapyr.+Imazemox(RM) 50g/haPOE (T10), Imazethapyr.+Imazemox(RM) 70g/haPOE (T11),
Imazethapyr.+Imazemox(RM) 80g/haPOE (T12), Pendimethalin1000g/ha PRE (T13), Imazethapyr +
Pendimethalin (RM)1000g/ha PRE (T14), Hoeing twice (T15) each performed at 20 and 40 DAS and
weedycheck (T16) replicated thrice. Blackgram var. T9 and mustard var. Shivani was sown at 30 cm using 30 and
8 kg seed/ha, with RDF 20:40:20 and 80:40:20 kg/ha, respectively. Imazethapyr.+Imazemox (RM)80g/ha POE
(T12) was found most effective in reducing weed density and weed dry weight followed by
Imazethapyr.+Imazemox (RM)70g/haPOE (T11) and Imazthapyr 80g/ha PRE (T3) in order of their weed control
efficiency 97.26, 95.78 and 93.55 percent respectively at 60 days after sowing. Imazethapyr.+Imazemox(RM)
80g/ha POE (T12) recorded 64.97 percent higher crop dry weight, 80.25 percent LAI, 98.28 percent number of
pod/plant, 70.91 percent higher seed yield higher as compared to weedy plot i.e. 104.05g/m2, 0.21,10,523 kg/ha
respectively. Application of Imazethapyr.+Imazemox(RM) 80g/ha POE (T12) also recorded higher net return
(`31664) and B:C ratio (1.5) compared to rest of weed treatments. Residues of herbicides were below detectable
limit (< 0.02mg/kg) in plant and soil at harvest. In succeeding crop, no phyto-toxic effect was observed in
blackgram and succeeding mustard crop.
It can be concluded from above findings that Imazethapyr.+Imazemox(RM) 80g/ha POE can be applied
in blackgram for increased yield, net return and benefit : cost ratio without causing phyto-toxic effect on
blackgram as well as on succeeding mustard crop.
Description
WEED MANAGEMENT IN BLACKGRAM
BY IMAZETHAPYR AND ITS EFFECT ON
SUCCEEDING MUSTARD