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Effect of crop establishment methods and weed management practices on rice and weeds

KrishiKosh

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Title Effect of crop establishment methods and weed management practices on rice and weeds
 
Creator Chainu Ram
 
Contributor Singh, Rohitashav
 
Subject crop establishment, weed control, rice, loamy soils, field experimentation, rice, transplantation, direct seeding
 
Description Thesis-PhD
Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar, U.S. Nagar (Uttarakhand) India, to study the effect of crop establishment methods and weed management practices on rice and weeds. The soil of the experimental field was loam in texture. The soil of experimental field was high in organic carbon (0.86%), low in available nitrogen (262.11 kg/ha), medium in available phosphorus (22.05 kg/ha) and potassium (258.82 kg/ha) with neutral pH (7.24). The experiment was conducted in split plot design with three replications; keeping rice establishment methods viz., direct dry seeded rice (DSR), wet seeded rice (WSR- sprouted seeds) and transplanted rice (TPR) in main plot and six levels of weed management practices viz., penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds, penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds followed by (fb) one hand weeding (HW) at 35DAS/DAT, bispyribac sodium 20 g/ha at 15DAS/DAT, bispyribac sodium 20 g/ha at 15DAS/DAT fb one hand weeding at 35DAS/DAT, weed free and weedy check in sub plot.
Density and dry weight of total weeds at all the stages found the lowest under TPR except at harvest stage where TPR recorded almost similar to that of WSR. Bispyribac sodium 20 g/ha at 15 DAS/DAT fb one HW at 35 DAS/DAT, being at par with penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds fb one HW at 35 DAS/DAT recorded the lowest density and dry weight of total weeds. The maximum nitrogen, phosphorus and potassium uptake by weeds recorded under direct dry seeded rice and lowest with transplanted rice. Uncontrolled weeds on an average depleted 66.15 kg N, 17.70 kg P and 43.19 kg K/ha, which was significantly higher than rest of the treatments. Bispyribac sodium 20 g/ha at 15 DAS/DAT fb one HW at 35 DAS/DAT accumulated the lowest nitrogen, phosphorus and potassium which was closely followed by application of penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds fb one HW at 35 DAS/DAT.
Transplanted rice yielded 9.55 & 17.11 and 10.30 & 18.55 per cent higher over crop raised through wet seeding and direct dry seeding during 2011 and 2012, respectively which was due to more number of panicles/m2. Uncontrolled weeds on an average caused 77.4 and 79.3 per cent reduction in yield during 2011 and 2012, respectively as compared to weed free situation. The highest grain yield was obtained under weed free condition being on par with the application of bispyribac sodium 20 g/ha at 15DAS/DAT fb one hand weeding at 35DAS/DAT and penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds fb one HW at 35DAS/DAT. The maximum net return was found under WSR with weed free condition followed by application of penoxsulam 22.5 g/ha or bispyribac sodium 20 g/ha fb one HW at 35 DAS/DAT.
On the basis of two years experimentation it may be concluded that transplanted and wet seeded rice has more weed suppression capacity than direct seeded rice. Wet seeded rice in combination with the application of penoxsulam 22.5 g/ha alongwith one HW at 35 DAS/DAT is the best option considering the ultimate net profit to farmers.
 
Date 2016-06-14T14:06:42Z
2016-06-14T14:06:42Z
2013-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67358
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)