Winter Wheat (Triticum aestivum) Yield Response to Winter Annual Broadleaf Weed Control

1995 ◽  
Vol 9 (3) ◽  
pp. 594-598 ◽  
Author(s):  
Robert C. Scott ◽  
Thomas F. Peeper ◽  
Jeffrey A. Koscelny
Keyword(s):  
Correlation Analysis ◽  
Winter Wheat ◽  
Weed Control ◽  
Wheat Yield ◽  
Yield Response ◽  
Wheat Grain ◽  
Primary Target ◽  
Herbicide Treatments ◽  
Winter Wheat Yield ◽  
Winter Annual

Selected herbicide treatments from 25 winter annual broadleaf weed control experiments conducted across Oklahoma from 1979 to 1993 were examined for winter wheat yield response to weed control. All experiments contained one or two of the same three weeds (henbit, bushy wallflower, or cutleaf eveningprimrose) as the primary target(s). Herbicide treatments included chlorsulfuron at 8.8 or 17.6 g ai/ha, and/or 2,4-D at 420 g ae/ha, all broadcast POST to wheat. Most herbicide treatments controlled the weeds, but increased wheat grain yield at only one site, wherein bushy wallflower density was 830/m2. Correlation analysis found no relationship between weed densities and wheat yield when chlorsulfuron at 8.8 g/ha was applied for henbit or moderate levels of bushy wallflower or cutleaf eveningprimrose. There was a significant positive relationship favoring spraying of bushy wallflower when the correlation analysis included data from one site with a density of 830 plants/m2.

Evaluation of Registered Herbicides for Cheat (Bromus secalinus) Control in Winter Wheat (Triticum aestivum)

1997 ◽  
Vol 11 (1) ◽  
pp. 30-34
Author(s):  
Jeffrey A. Koscelny ◽  
Thomas F. Peeper
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Field Experiments ◽  
Wheat Yield ◽  
Wheat Grain ◽  
Grain Yields ◽  
Bromus Secalinus ◽  
Herbicide Treatments ◽  
Early Fall

Seven field experiments were conducted in Oklahoma to compare efficacy and wheat response to currently registered cheat suppression or control herbicide treatments. Chlorsulfuron + metsulfuron premix (5:1 w/w) at 26 g ai/ha applied PRE controlled cheat 20 to 61%, increased wheat grain yields at two of seven locations, and decreased dockage due to cheat at five of seven locations. Chlorsulfuron + metsulfuron at 21 g/ha tank-mixed with metribuzin at 210 g/ha, applied early fall POST, controlled cheat 36 to 98% and increased wheat yield at four of seven locations. Metribuzin applied POST in the fall at 420 g/ha controlled cheat 56 to 98% and increased wheat yields at five of seven locations. Both POST treatments decreased dockage at all locations.

The integration of herbicides with mechanical weeding for weed control in winter wheat

2002 ◽  
Vol 139 (4) ◽  
pp. 385-395 ◽  
Author(s):  
A. M. BLAIR ◽  
P. A. JONES ◽  
R. H. INGLE ◽  
N. D. TILLETT ◽  
T. HAGUE
Keyword(s):  
Winter Wheat ◽  
Weed Control ◽  
Wheat Yield ◽  
Specific Weight ◽  
Cultural Control ◽  
Integrated System ◽  
Guidance System ◽  
Winter Wheat Yield ◽  
Weed Infestation ◽  
Grass Weed

Two systems for integrated weed control in winter wheat based around the combination of herbicides with cultural control have been investigated and compared with conventional practice in experiments between 1993 and 2001. These systems were (a) an overall spray of a reduced herbicide dose followed by spring tine harrow weeding and (b) the combination of herbicide applied over the crop row with a novel vision guided inter-row hoe. The latter required wheat to be established with a wider (22 cm) inter-row spacing than standard (12·5 cm). Experiments over 10 sites/seasons indicated that this increased spacing could be achieved without yield loss. Trials to measure the accuracy of hoe blade lateral positioning using the vision guidance system indicated that error was normally distributed with standard deviation of 12 mm and a bias that could be set to within 1 cm. This performance could be maintained through the normal hoeing period and the crop row location and tracking techniques were robust to moderate weed infestation. In the absence of weeds neither overall harrowing nor inter-row hoeing affected winter wheat yield, 1000-seed weight or specific weight in 12·5 or 22 cm rows. When combined with inter-row hoeing, manually targeted banded applications of fluazolate, pendimethalin or isoproturon reduced grass weed levels and increased yields over untreated controls, though better results were obtained using overall herbicides. However, improvements would be possible with more accurately targeted herbicide applications and more effective inter-row grass weed control. The implications and costs of using such an integrated system are discussed and requirements for future developments identified.

Winter Wheat Yield Response to a Urea Amended with a Urease Inhibitor and Fertilization Time

2011 ◽  
Vol 10 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Nathan A. Slaton ◽  
Richard J. Norman ◽  
Jason Kelley
Keyword(s):  
Winter Wheat ◽  
Wheat Yield ◽  
Yield Response ◽  
Urease Inhibitor ◽  
Winter Wheat Yield

scholarly journals Examination of Winter Wheat Yield Response to Seed Source

jpa ◽  
1990 ◽  
Vol 3 (4) ◽  
pp. 551-557 ◽  
Author(s):  
Mary K. Knudson ◽  
LeRoy T. Hansen
Keyword(s):  
Winter Wheat ◽  
Wheat Yield ◽  
Seed Source ◽  
Yield Response ◽  
Winter Wheat Yield

Herbicide-Grazing Interactions in Cheat (Bromus secalinus)–Infested Winter Wheat (Triticum aestivum)1

Weed Science ◽  
1990 ◽  
Vol 38 (6) ◽  
pp. 532-535 ◽  
Author(s):  
Jeffrey A. Koscelny ◽  
Thomas F. Peeper
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Grain Yield ◽  
Yield Components ◽  
Harvest Index ◽  
Field Experiments ◽  
Wheat Yield ◽  
Wheat Grain ◽  
Bromus Secalinus ◽  
Herbicide Treatments

Field experiments were conducted to determine the interaction of grazing and herbicide treatments on cheat control and biomass, wheat biomass, wheat grain yield, and wheat yield components. Ethyl-metribuzin at 1120 g ai ha−1and metribuzin at 420 g ai ha−1reduced cheat biomass 91 to 99 and 97 to 98%, respectively. Grazing had no effect on herbicide efficacy. Grazing increased cheat biomass in the check by 24% at only one location but did not affect total wheat plus cheat biomass. With one exception, controlled cheat was replaced by wheat on a 1:1 biomass basis when herbicides caused no crop injury. All herbicide treatments increased grain yield, but grazing did not alter yield. At two locations, increased heads m−2and spikelets/head accounted for most of the grain yield increases, but at one location seeds/spikelet and weight/seed were also increased. Harvest index was unaffected.

Economic Returns from Broadleaf Weed Control in Hard Red Winter Wheat (Triticum aestivum)

1994 ◽  
Vol 8 (04) ◽  
pp. 797-806 ◽  
Author(s):  
Robert C. Scott ◽  
Thomas F. Peeper
Keyword(s):  
Winter Wheat ◽  
Weed Control ◽  
Wheat Yield ◽  
Primary Objective ◽  
Economic Returns ◽  
Net Returns ◽  
Hard Red Winter Wheat ◽  
Herbicide Treatments ◽  
Nitrogen Rates ◽  
Red Winter Wheat

Seventeen on-farm and two experiment station experiments were conducted to evaluate farmers' decisions to apply broadleaf weed control herbicides to tillered hard red winter wheat in February or March with or without urea-ammonium nitrate (28-0-0) fertilizer carrier. The herbicides and rates varied by farm, but all farmers applied a residual sulfonylurea herbicide and four added a phenoxy herbicide. Most farmer-selected herbicide treatments controlled target weeds including bushy wallflower, flixweed, henbit, plains coreopsis, smallflowered bittercress, and wild buckwheat. Controlling these weeds increased wheat yield on only two farms. Farmer-selected, commercially applied treatments increased net returns at two of seventeen farms, decreased net returns at seven farms, and did not affect returns at eight farms. Net returns were increased over the farmer-selected treatments at two farms when half the farmer-selected rate of herbicide was used. Half-rate herbicide treatments controlled weeds up to 25% less than farmer-selected treatments. Weed control with the half-rate treatments ranged from 60 to 98%. None of the farmers expected that herbicide use would increase yield. Their primary objective was to have weed-free fields at harvest. Nitrogen rates appeared to be selected without a rational basis for decision making.

On-Farm Evaluation of Winter Wheat Yield Response to Residual Soil Nitrate-N in North China Plain

2008 ◽  
Vol 100 (6) ◽  
pp. 1527-1534 ◽  
Author(s):  
Zhenling Cui ◽  
Xinping Chen ◽  
Yuxin Miao ◽  
Fei Li ◽  
Fusuo Zhang ◽  
...  
Keyword(s):  
Winter Wheat ◽  
North China Plain ◽  
North China ◽  
Wheat Yield ◽  
Yield Response ◽  
Residual Soil ◽  
Soil Nitrate ◽  
Nitrate N ◽  
Winter Wheat Yield ◽  
On Farm

Effect of No-till Systems on Weed Control and Yields of Continuous Winter Wheat (Triticum aestivum)

Weed Science ◽  
1983 ◽  
Vol 31 (6) ◽  
pp. 813-818 ◽  
Author(s):  
Charles L. Cleary ◽  
Thomas F. Peeper
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Weed Control ◽  
Production Systems ◽  
Conventional Tillage ◽  
Yellow Nutsedge ◽  
No Till ◽  
Herbicide Treatments ◽  
Winter Annual ◽  
Annual Weeds

Experiments were conducted from 1979 to 1982 to determine whether selected herbicide treatments applied before or after harvest would provide adequate weed control without the use of tillage between crops in continuous winter wheat (Triticum aestivumL.) production systems. of the herbicide treatments evaluated, only oryzalin (3,5-dinitro-N4,N4-dipropylsulfanilamide) at 2.2 kg ai/ha applied prior to wheat maturity adequately controlled summer annual weeds each year. Populations of yellow nutsedge (Cyperus esculentusL. # CYPES) and/or clammy groundcherry (Physalis heterophyllaNees) increased from continued preharvest use of oryzalin in no-till treatments and were greater than those resulting from conventional tillage or various postharvest no-till treatments containing glyphosate [N-(phosphonomethyl)glycine]. After 4 yr, populations of winter annualCruciferaespp. at one location were lower in treatments that had poorer control of summer annual weeds or volunteer wheat. At a second location, winter annual broadleaf species were more numerous in conventionally tilled than in no-till treatments. Wheat yields obtained with no-till treatments were lower than yields obtained with conventional tillage in seasons favorable for high yields.

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