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Effect of Herbicides on Weed Seed Bank and Productivity of Maize (Zea mays L.)

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Title Effect of Herbicides on Weed Seed Bank and Productivity of Maize (Zea mays L.)
 
Creator Shantveerayya Hawaldar
 
Contributor C.A. Agasimani
 
Subject Agronomy
 
Description A field experiment was conducted during kharif season 2010 at Main
Agricultural Research Station, University of Agricultural Sciences, Dharwad to study
the effect of herbicides on weed seed bank and productivity of maize. The results
revealed that Atrazine (0.75 kg/ ha pre-em) followed by 2,4- D (1.00 kg/ ha post-em)
at 30 DAS recorded significant reduction in weed seed bank and gave an excellent
control of weeds followed by mechanical weeding. Significantly lower weed
population, weed dry weight and higher weed control efficiency (WCE) was noticed
in weed free check and Atrazine (0.75 kg/ ha pre-em) followed by 2,4- D (1.00 kg/ha
post-em) during the different growth stages of crop. Significantly higher total weed
dry weight was recorded in weedy check. Plant height, number of green leaves, LAI
and total dry matter production was higher in Atrazine (0.75 kg/ ha pre-em ) followed
by 2,4- D (1.00 kg/ ha post- em). Significantly higher net returns (Rs.72992.50) and
benefit : cost ratio(3.47) was recorded in Atrazine (0.75 kg/ ha pre-em) followed by
2,4- D (1.00 kg/ ha post- em). Application of Oxyfluorfen (0.25 kg/ ha post–em) at 20
DAS showed phytotoxic effect on crop. The data on dehydrogenase activity and soil
respiration revealed that at 60 and 90 DAS weed free check recorded highest
dehydrogenase activity which was on par with sequential application of atrazine
(0.75 kg ha-1) followed by 2, 4-D (1.00 kg ha-1) and post- emergent application of
oxyfluorfen (0.25 kg ha-1) but at harvest dehydrogenase activity was decreased. This
was mainly due to the lesser microbial activity at the harvest and lesser herbicidal
residual activity at this stage. At recommended dose of herbicides initially stimulates
but subsequently inhibits the dehydrogenase and soil respiration activity.
 
Date 2016-11-10T16:51:47Z
2016-11-10T16:51:47Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84972
 
Format application/pdf
 
Publisher UAS, Dharwad