physicochemical
Contents of 39(1 & 2) 2011 - acharya ng ranga agricultural university
Contents of 39(1 & 2) 2011 - acharya ng ranga agricultural university
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Research Note<br />
J.Res. ANGRAU 39(1&2)82-83, 2011<br />
MANAGEMENT OF CHROZOPHORA ROTTLERI IN CHICKPEA (Cicer aretinum L)<br />
M. RATNAM, A. S. RAO and T. Y. REDDY<br />
Regional Agril. Research Station, Acharya NG Ranga Agricultural University,<br />
Lam Farm, Guntur-500 034<br />
Chrozophora rottleri is commonly called as<br />
suryavathi or lingamirapa or erramiriyamu, it is an<br />
erect annual broad leaf weed in uplands and rice<br />
fallows, blossoms profusely from January to April.<br />
Plant has silky hairs, lower part of the stem is naked<br />
and upper port is hairy. It has slender tap root, leaves<br />
densely hairy on both sides. In recent years the<br />
chickpea crop became popular in upland areas of<br />
kurnool, Guntur and Praksam districts of Andhra<br />
Pradesh due to crop holiday to tobacco. Chickpea<br />
grown as winter crop, at the same time Chrozophora<br />
rottleri is also associated with this crop. Manual<br />
removing is very difficult due to its hairyness which<br />
causes the allergy to labour, hence the present<br />
investigation was conducted to manage the<br />
Chrozophora rottleri in chickpea by adopting suitable<br />
weed management practices under upland situation.<br />
The experiment was laid out at RARS, Lam,<br />
Guntur during rabi 2006-07, 2007-08 & 2008-09. After<br />
thorough preparation of land the treated chickpea seed<br />
was line sown by adopting the spacing of 30 x 10<br />
cm. The collected seed of Chrozophora spp was<br />
inoculated in the experimental plots to attain the<br />
uniformity in Chrozophora spp population. The pre<br />
and post emergence herbicide treatments were<br />
imposed as per schedule respectively. All the<br />
recommended package of practices except weed<br />
control were followed in raising the crop. The crop<br />
was irrigated at 40 DAS. There were no major pests<br />
and diseases during the season but during the initial<br />
stage of the crop Spodoptera was noticed and it was<br />
corrected by spraying chloripyriphos and indoxicarb.<br />
In the experimental plots, Chrozophora<br />
rottleri was the dominating weed (> 75%). Besides<br />
this weed, grasses (Echinochloa spp, Dinabra spp,<br />
Panicum spp, Sporobolus and Cynodon dactylon),<br />
sedges (Cyperus rotudrus) and broad leaf weeds<br />
(Phyllunthus niruri, Aristolochia bracteata, Trianthima<br />
portulacastrum, Portulaca oleratia, Digera arvensis,<br />
were also observed but their presence was negligible.<br />
Chrozophora rottleri density was recorded at<br />
30, 60 DAS and at harvest and weed dry weight was<br />
recorded at harvest. All the integrated treatments<br />
significantly reduced the Chrozophora rottleri density<br />
and dry weight over weedy check at all stages of<br />
observation and were on par with hand weeding at 15<br />
and 30 DAS. Among the individual herbicides, post<br />
emergence application of imazethapyr 63 gha -1<br />
applied at 15 DAS was slightly effective and reduced<br />
the density of Chrozophora spp over weedy check at<br />
all stages of observations (Table.1). The pre<br />
emergence herbicides pendimethalin, pretilachlor,<br />
oxyfluorfen were failed to prevent the germination of<br />
chrozophora spp and were as good as un weeded<br />
check.<br />
Based on the three years study it can be<br />
inferred that hand weeding at 15 and 30 DAS reduced<br />
density and dry weight of Chrozophora spp. The post<br />
emergence application of imazethapyr 63 gha -1 at 15<br />
DAS though reduced density and dry weight of<br />
Chrozophora spp, it caused 20 % crop injury. Further<br />
research is needed in this direction.<br />
Email Id: mekala1968@gmail.com<br />
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