Predicting Winter Wheat (Triticum aestivum) Yield Loss Based on Jointed Goatgrass (Aegilops cylindrica) Populations From the Previous Season1

2000 ◽  
Vol 14 (2) ◽  
pp. 423-427 ◽  
Author(s):  
FRANK L. YOUNG ◽  
ERIC R. GALLANDT ◽  
J. RICHARD ALLDREDGE
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Yield Loss ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass

Jointed Goatgrass (Aegilops cylindrica) Ecology and Interference in Winter Wheat

Weed Science ◽  
1993 ◽  
Vol 41 (3) ◽  
pp. 388-393 ◽  
Author(s):  
R. L. Anderson
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Soil Water ◽  
Yield Loss ◽  
Cultural Practices ◽  
Control Measures ◽  
Water Extraction ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass ◽  
Soil Water Extraction

Jointed goatgrass is a serious weed in winter wheat, and presently no herbicides are available for its selective control. This study examined the effect of time of emergence and removal on jointed goatgrass interference in winter wheat, as well as its rate of development and soil water extraction. The goal of this study was to suggest cultural practices that minimize jointed goatgrass interference in winter wheat. Jointed goatgrass development was identical to ‘Vona’ winter wheat in two crop seasons, even though precipitation differed drastically between seasons. Depth of soil water extraction of both species was also similar. Jointed goatgrass at 18 plants m−2reduced grain yield 27 and 17% when emerging 0 and 42 d after Vona, respectively. The relationship between time of jointed goatgrass emergence after winter wheat and grain yield loss was Y = 30.6–0.29X (X = days, r = 0.72), indicating that plants emerging in late fall still caused yield loss. Removing jointed goatgrass by early March prevented winter wheat grain yield loss. The interference data suggests that producers assess infestation levels and plan control measures in early March.

Sampling Wheat (Triticum aestivum) at the Elevator for Jointed Goatgrass (Aegilops cylindrica)

1994 ◽  
Vol 8 (1) ◽  
pp. 64-68 ◽  
Author(s):  
Drew J. Lyon ◽  
John A. Smith ◽  
David D. Jones
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Geographic Distribution ◽  
Field Survey ◽  
Mail Survey ◽  
Wheat Grain ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass

Winter wheat grain contaminated with jointed goatgrass joints is often discounted as much as 20% by grain buyers. A mail survey to Nebraska farmers in 1984 identified jointed goatgrass as one of the ten worst weed problems in winter wheat, but a field survey to the same area in 1986 found it in less than 1% of surveyed fields. The objective of this survey was to map the geographic distribution and severity of jointed goatgrass contaminating winter wheat grain in western Nebraska. Jointed goatgrass was found in 25, 29, and 20% of all wheat samples collected in 1990, 1991, and 1992, respectively. Nebraska counties bordering Colorado were found to have the highest percentage of wheat samples contaminated with jointed goatgrass joints, ranging from 23% in Cheyenne county in 1992 to 61% in Keith county in 1991.

Competitive Relationships Among Winter Wheat (Triticum aestivum), Jointed Goatgrass (Aegilops cylindrica), and Downy Brome (Bromus tectorum)

Weed Science ◽  
1988 ◽  
Vol 36 (4) ◽  
pp. 479-486 ◽  
Author(s):  
Gwen F. Fleming ◽  
Frank L. Young ◽  
Alex G. Ogg
Keyword(s):  
Triticum Aestivum ◽  
Soil Moisture ◽  
Winter Wheat ◽  
Bromus Tectorum ◽  
Relative Yield ◽  
Growth Chamber ◽  
Downy Brome ◽  
Replacement Series ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass

In three replacement series experiments, winter wheat (Triticum aestivumL.), jointed goatgrass (Aegilops cylindricaHost. #3AEGCY), and downy brome (Bromus tectorumL. # BROTE) were paired in all possible combinations to determine competitive relationships during vegetative growth. Under growth chamber conditions of ample fertility and soil moisture and day/night temperatures of 18/10 C, relative yield totals for the three species were similar, indicating that they compete for the same resources. Both winter wheat and jointed goatgrass had greater plant growth and higher relative crowding coefficients than downy brome, which indicated a hierarchy of relative competitiveness of winter wheat > jointed goatgrass >> downy brome. In other growth chamber studies, winter wheat was slightly more competitive than jointed goatgrass regardless of fertility levels. Winter wheat was the superior competitor at 18/10 C and −33 kPa (soil moisture), whereas jointed goatgrass was superior at 27/10 C and −300 kPa, conditions that are frequently encountered in the Pacific Northwest.

Visualization of A- and B-genome chromosomes in wheat (Triticum aestivum L.) × jointed goatgrass (Aegilops cylindrica Host) backcross progenies

Genome ◽  
2000 ◽  
Vol 43 (6) ◽  
pp. 1038-1044 ◽  
Author(s):  
Z.N. Wang ◽  
A. Hang ◽  
J. Hansen ◽  
C. Burton ◽  
C.A. Mallory-Smith ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Aegilops Cylindrica ◽  
B Genome ◽  
Jointed Goatgrass

Fertilizer Placement Affects Jointed Goatgrass (Aegilops cylindrica) Competition In Winter Wheat (Triticum aestivum)

1999 ◽  
Vol 13 (2) ◽  
pp. 374-377 ◽  
Author(s):  
Abdel O. Mesbah ◽  
Stephen D. Miller
Keyword(s):  
Winter Wheat ◽  
Seed Weight ◽  
Wheat Yield ◽  
Soil Surface ◽  
Fertilizer Placement ◽  
Aegilops Cylindrica ◽  
Plant Seeds ◽  
Placement Method ◽  
Jointed Goatgrass ◽  
Injection Methods

A 3-yr study was conducted in eastern Wyoming from 1995 to 1997 to evaluate the effect of fertilizer placement on jointed goatgrass competitiveness with winter wheat. Fertilizer placement methods consisted of applying 45 kg/ha of nitrogen (50% as urea and 50% as ammonium nitrate) in a deep band 5 cm below and 2.5 cm to the side of the wheat row, broadcasting on the soil surface, or injecting fertilizer by spoke wheel 10 cm deep and 5 cm to the side of the wheat row. Neither fertilizer placement nor jointed goatgrass presence affected winter wheat stand. Wheat yield reductions from jointed goatgrass competition were 7 and 10% higher with the broadcast than deep-band or spoke-wheel injection methods, respectively. Wheat spikes/plant, seeds/spike, 200-seed weight, and plant height were not influenced by fertilizer placement; however, the presence of 35 jointed goatgrass plants/m2reduced spikes/plant 21%, seeds/spike 12%, and 200-seed weight 6%. Jointed goatgrass populations were not influenced by fertilizer placement method; however, the number of spikes/plant was reduced 8 and 10%, joints/spike 3%, and biomass 15 and 21% by deep band or spoke wheel fertilizer placement.

Vernalization responses of field grown jointed goatgrass (Aegilops cylindrica), winter wheat, and spring wheat

Weed Science ◽  
2006 ◽  
Vol 54 (4) ◽  
pp. 695-704 ◽  
Author(s):  
Lynn Fandrich ◽  
Carol A. Mallory-Smith
Keyword(s):  
Winter Wheat ◽  
Spring Wheat ◽  
Seed Quality ◽  
Field Studies ◽  
Planting Dates ◽  
Aegilops Cylindrica ◽  
Growing Seasons ◽  
Jointed Goatgrass ◽  
Spring Temperatures ◽  
Developmental Responses

Numerous studies have quantified the developmental responses of wheat to vernalization, but its response compared to a weedy relative, jointed goatgrass, remains relatively unknown. Six paired jointed goatgrass collections gathered from Washington and Oregon fields, and winter and spring wheat, were grown in field studies to quantify yield and germination in response to vernalization. Monthly planting dates initiated in October and concluded in March were used to vary the vernalization durations for plants sown at three Oregon locations (Corvallis, Moro, and Pendleton) over two growing seasons. Minimum vernalization requirements to produce reproductive spikes were similar among plants of six jointed goatgrass collections. Jointed goatgrass collections grown at Corvallis required a minimum of 89 and 78 vernalization days (January 17, 2003 and January 22, 2004 sowing, respectively) to produce reproductive spikes, and plants grown at Moro required 60 vernalization days (March 3 and February 23) in both years, and 48 and 44 vernalization days (March 3 and February 24) were required by plants to produce spikes at Pendleton. Jointed goatgrass spikelet and winter wheat seed yield were positively influenced by vernalization days, experiment location, and year. The strength of the interactions among these main effects differed among jointed goatgrass collections and winter wheat. The effects of vernalization on jointed goatgrass yields and seed quality were more pronounced at Pendleton, OR, a location where jointed goatgrass has adapted, compared to Corvallis, OR, where it has not adapted. The minimum vernalization days required to produce germinable seed differed among jointed goatgrass collections, winter and spring wheat. There was not a selection of spring-adapted jointed goatgrass populations in the populations tested. Yet if spring temperatures are cool, minimum conditions for vernalization may be satisfied, and the benefits of planting spring crops to control jointed goatgrass would be reduced.

Characterizing jointed goatgrass (Aegilops cylindrica) × winter wheat hybrids in Oklahoma

Weed Science ◽  
2004 ◽  
Vol 52 (5) ◽  
pp. 742-745 ◽  
Author(s):  
Amanda E. Stone ◽  
Thomas F. Peeper
Keyword(s):  
Winter Wheat ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass ◽  
Wheat Hybrids

Nutrient deficiencies do not contribute to yield loss after waterlogging events in winter wheat (Triticum aestivum )

2018 ◽  
Vol 173 (2) ◽  
pp. 141-153 ◽  
Author(s):  
A.-C. Wollmer ◽  
B. Pitann ◽  
K.-H. Mühling
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Yield Loss ◽  
Nutrient Deficiencies
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