Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Control of mixed weed flora in wheat with pre- and post-emergence
herbicide combinationsSimerjeet Kaur, Tarundeep Kaur and MS Bhullar
Department of Agronomy, PAU, Ludhiana
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
The Problem
Weeds have been one of major biotic constraint in wheat
Crop infested with grasses and broadleaf weeds
Continuous use of herbicides having similar mode of action
results in weed flora shift and development of herbicide
resistance in weeds
Options
Sequential application of pre- and post-emergence herbicides
Use of tank-mix or ready-mix herbicide having dissimilar modes
of action
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Experimental details
The efficacy of different pre- and post emergence herbicides andtheir tank-, and pre-mixes were evaluated in wheat during 2015-16in Punjab.
The wheat (cv HD 2967) was sown in Nov 2015 under irrigatedconditions and harvested in April 2016.
Pendimethalin and metribuzin were applied as pre-emergence, oneday after sowing and the post-em herbicides, at 35 DAS.
For pre-em, 500 L water, and for post-em, 375 L water/ha was used.
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Treatments (kg/ha) Time of application
Pendimethalin 0.75 PRE
Pendimethalin 1.0 PRE
Metribuzin 0.175 PRE
Metribuzin 0.21 PRE
Pendimethalin 0.75 + metribuzin 0.175 PRE
Pendimethalin 1.0 + metribuzin 0.175 PRE
Sulfosulfuron 0.025 POST
Clodinafop 0.06 POST
Pendimethalin 0.75 fb sulfosulfuron 0.018 PRE fb POST
Pendimethalin 1.0 fb sulfosulfuron 0.018 PRE fb POST
Sulfosulfuron+metsulfuron 0.03 +0.002 POST
Mesosulfuron + iodosulfuron 0.012 +0.0024 POST
Clodinafop + metsulfuron 0.06 + 0.004 POST
Pinoxaden 0.06 + metsulfuron 0.004 POST
2 Hand weedings 30 and 60 DAS
Unsprayed control -
PRE: pre-emergence; POST: post-emergence; fb: followed by
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Efficacy of pre-emergence herbicides at 30 DAS
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P. minor M. denticulata R. dentatus C. album
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Medicago Rumex Chenopodium Coronopus Phalaris
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at Maharana Pratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Effect of different weed control treatments on weed density at 60 DAS
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Treatments (kg/ha)Weed biomass (g/m2) at 60 DAS*
WCE (%)Grasses Broadleaves
Pendi 0.75 5.0 (24) 3.1 (9) 32.2
Pendi 1.0 3.7 (13) 2.6 (6) 60.0
Metri 0.175 5.4 (28) 3.4 (10) 19.2
Metri 0.21 4.4 (18) 3.3 (10) 41.5
Pendi 0.75 + metri 0.175 3.4 (11) 3.0 (8) 60.0
Pendi 1.0 + metri 0.175 3.4 (11) 2.4 (5) 67.4
Sulfo 0.025 6.1 (37) 3.2 (9) 23.1
Clodina 0.06 5.4 (29) 4.5 (19) -1.3
Pendi 0.75 fb Sulfo 0.018 2.0 (3) 1.0 (0) 93.8
Pendi 1.0 fb Sulfo 0.018 1.6 (2) 1.0 (0) 96.4
Sulfo+metsulf 0.03 +0.002 4.4 (19) 1.0 (0) 41.3
Mesosulf + iodosulf 0.012 +0.0024 4.7 (21) 1.0 (0) 55.2
Clodina + metsulf 0.06 + 0.004 5.1 (26) 1.0 (0) 45.8
Pinoxa 0.06 + metsulf 0.004 4.4 (23) 1.0 (0) 52.4
2 HW 1.0 (0) 1.0 (0) 100.0
Unsprayed control 5.7 (32) 4.1 (16)
LSD (p=0.05) 1.1 0.5
*Data is subjected to square root transformation.
Figures in parenthesis are means of original values
Effect of different weed control treatments on weeds
Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
Effect of different weed control treatments on crop yield and economics
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Biennial Conference “Doubling Farmers’ Income by 2022: The Role of Weed Science” held at MaharanaPratap University of Agriculture and Technology, Udaipur (Rajasthan) on March 1-3, 2017
CONCLUSIONS
Broad-spectrum control of weeds in wheat can be achieved
by :
Sequential application of pendimethalin 0.75-1.0 kg/ha
and sulfosulfuron 0.018 kg/ha or
Pre-mix application of sulfosulfuron+metsulfuron 0.03
+0.002 kg/ha or mesosulfuron + iodosulfuron 0.012
+ 0.0024 kg/ha or
Tank-mix application of pinoxaden 0.06 kg + metsulfuron
0.004 kg/ha
