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You searched for: Journal Weed science Remove constraint Journal: Weed science Publication Year 2002 Remove constraint Publication Year: 2002 Subject Glycine max Remove constraint Subject: Glycine max Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
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1. Critical period for weed control: the concept and data analysis

Author:
Knezevic, Stevan Z.; Evans, Sean P.; Blankenship, Erin E.; Van Acker, Rene C.; Lindquist, John L.
Source:
Weed science 2002 v.50 no.6 pp. 773-786
ISSN:
0043-1745
Subject:
Glycine max; Zea mays; corn; crops; glyphosate; herbicide resistance; soybeans; weed control; weeds
Abstract:
... The critical period for weed control (CPWC) is a period in the crop growth cycle during which weeds must be controlled to prevent yield losses. Knowing the CPWC is useful in making decisions on the need for and timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. An increase in the use of herbicide-tolerant crops, especially soybean resist ...
DOI:
10.1614/0043-1745(2002)050[0773:CPFWCT]2.0.CO;2

2. Multivariate differentiation of quackgrass (Elytrigia repens) from three farming systems

Author:
Mercer, Kristin L.; Jordan, Nicholas R.; Wyse, Donald L.; Shaw, Ruth G.
Source:
Weed science 2002 v.50 no.5 pp. 677-685
ISSN:
0043-1745
Subject:
Avena sativa; Elymus repens subsp. repens; Glycine max; Zea mays; arable soils; control methods; corn; evolution; farming systems; genetic variation; hay; oats; pastures; perennials; principal component analysis; risk; soybeans; weed control; weeds; Minnesota
Abstract:
... The genetic variation of quackgrass as a species and the array of environments in which it is found indicate that selection in these different environments could lead to differentiation among quackgrass populations. Yet, a highly diverse environment might not promote the genetic divergence of quackgrass if it poses contradictory selection pressures. To assess the extent of divergence among quackgr ...
DOI:
10.1614/0043-1745(2002)050[0677:MDOQER]2.0.CO;2

3. Crop rotation and tillage system effects on weed seedbanks

Author:
Cardina, John; Herms, Catherine P.; Doohan, Douglas J.
Source:
Weed science 2002 v.50 no.4 pp. 448-460
ISSN:
0043-1745
Subject:
no-tillage; Oxalis; Persicaria pensylvanica; Veronica; Capsella bursa-pastoris; hay; Euphorbia maculata; Setaria faberi; Zea mays; Glycine max; seeds; Chenopodium album; corn; species diversity; weeds; crop rotation; plant communities; oats; herbicides; soybeans; growing season; plows; Avena sativa; Amaranthus retroflexus; crops; Ohio; Pennsylvania
Abstract:
... We characterized the size and species composition of the weed seedbank after 35 yr of continuous crop rotation and tillage system treatments at two locations in Ohio. Spring seedbanks were monitored during 1997, 1998, and 1999 in continuous corn (CCC), corn––soybean (CS), and corn––oats––hay (COH) rotations in moldboard plow (MP), chisel plow (CP), and no-tillage (NT) plots where the same herbicid ...
DOI:
10.1614/0043-1745(2002)050[0448:CRATSE]2.0.CO;2

4. Evaluation of alternative weed management systems in a modified no-tillage corn––soybean––winter wheat rotation: weed densities, crop yield, and economics

Author:
Swanton, Clarence J.; Shrestha, Anil; Clements, David R.; Booth, Barbara D.; Chandler, Kevin
Source:
Weed science 2002 v.50 no.4 pp. 504-511
ISSN:
0043-1745
Subject:
Glycine max; MCPA (herbicide); MCPB (herbicide); Triticum aestivum; Zea mays; control methods; corn; crop rotation; crop yield; crops; farming systems; glyphosate; growing season; imazethapyr; income; integrated weed management; interrow tillage; linuron; management systems; metolachlor; no-tillage; postemergent weed control; soybeans; weeds; winter wheat; Canada
Abstract:
... A 9-yr (1990––1998) study was conducted at Woodstock, ON, Canada, to evaluate weed densities, crop yields, and gross returns in a modified no-tillage (no primary tillage) corn––soybean––winter wheat rotation under three weed management treatments: (1) minimum, preplant application of glyphosate followed by mechanical control; (2) integrated weed management (IWM), preplant application of glyphosate ...
DOI:
10.1614/0043-1745(2002)050[0504:EOAWMS]2.0.CO;2

5. Influence of simulated seed rain on the seed bank of wild-proso millet

Author:
Williams, Bill J.; Harvey, R. Gordon
Source:
Weed science 2002 v.50 no.3 pp. 340-343
ISSN:
0043-1745
Subject:
Glycine max; Panicum miliaceum subsp. ruderale; Zea mays; buried seeds; corn; field experimentation; seed dispersal; soil; soybeans; spring; weed science
Abstract:
... A field experiment was conducted between 1988 and 1993 to determine the number of wild-proso millet seed that could be returned to the soil without increasing future soil seed bank populations. The first seed bank (1988) was 15,300 seed m⁻⁻² and ranged from 14,000 to 21,000 seed m⁻⁻², which represented a high seed population for the area. Seed rain treatments of 0, 3, 6, 12, 24, and 48%% of the 19 ...
DOI:
10.1614/0043-1745(2002)050[0340:IOSSRO]2.0.CO;2

6. Critical periods of weed control in soybean for full field and in-furrow interference

Author:
Eyherabide, Juan J.; Cendoya, Maríía G.
Source:
Weed science 2002 v.50 no.2 pp. 162-166
ISSN:
0043-1745
Subject:
Glycine max; annual weeds; broadleaf weeds; crop-weed competition; developmental stages; furrows; grasses; soybeans; weed control; Argentina
Abstract:
... Soybean and annual weed competition studies were conducted over 2 yr in Balcarce, Argentina, to define the critical period of weed control and to compare yield losses in soybean, when weeds competed in the total cropping area (row plus furrow) or only in the furrow. In the first year, broad-leaf weeds were more abundant than annual grasses, but in the second year, grasses were more abundant. Criti ...
DOI:
10.1614/0043-1745(2002)050[0162:CPOWCI]2.0.CO;2

7. Estimating giant foxtail cohort productivity in soybean based on weed density, leaf area, or volume

Author:
Conley, Shawn P.; Binning, Larry K.; Boerboom, Chris M.; Stoltenberg, David E.
Source:
Weed science 2002 v.50 no.1 pp. 72-78
ISSN:
0043-1745
Subject:
Glycine max; Setaria faberi; bioeconomics; biomass; cotyledons; crop yield; developmental stages; fecundity; leaf area; prediction; shoots; soybeans; weed control; weeds
Abstract:
... Understanding weed–crop interactions is critical in predicting crop yield loss, but it is also important to understand how these interactions affect weed productivity. Therefore, research was conducted to characterize the weed relative leaf area and weed relative volume of several giant foxtail cohorts in soybean, and to assess weed density and cohort emergence time, weed relative leaf area, and w ...
DOI:
10.1614/0043-1745(2002)050[0072:EGFCPI]2.0.CO;2

8. Hemp sesbania interference in drill-seeded glyphosate-resistant soybean

Author:
Norsworthy, Jason K.; Oliver, Lawrence R.
Source:
Weed science 2002 v.50 no.1 pp. 34-41
ISSN:
0043-1745
Subject:
Glycine max; Sesbania exaltata; buried seeds; developmental stages; field experimentation; glyphosate; hemp; herbicide resistance; planting; seed yield; sowing; soybeans; weed control; weeds; Arkansas
Abstract:
... Field experiments were conducted at Fayetteville, AR, in 1997, 1998, and 1999 to evaluate the degree of interspecific interference between drill-seeded, glyphosate-resistant soybean and hemp sesbania as influenced by soybean population, hemp sesbania density, and a single glyphosate application. Soybean was planted at 247,000, 430,000, and 618,000 seed ha⁻⁻¹ with early-season emergence of 217,000, ...
DOI:
10.1614/0043-1745(2002)050[0034:HSIIDS]2.0.CO;2

9. Management programs and crop rotations influence populations of annual grass weeds and yellow nutsedge

Author:
Manley, Brian S.; Wilson, Henry P.; Hines, Thomas E.
Source:
Weed science 2002 v.50 no.1 pp. 112-119
ISSN:
0043-1745
Subject:
Cyperus esculentus; Digitaria ischaemum; Digitaria sanguinalis; Eragrostis cilianensis; Glycine max; Panicum dichotomiflorum; Solanum lycopersicum var. lycopersicum; Zea mays; acetolactate synthase; atrazine; butylate; corn; crop rotation; fenoxaprop; fluazifop-P; fomesafen; grass weeds; grasses; imazaquin; imazethapyr; nicosulfuron; pesticide application; soybeans; tomatoes
Abstract:
... The effects of several crop rotations and herbicide programs on populations of goosegrass, stinkgrass, large crabgrass, smooth crabgrass, fall panicum, and yellow nutsedge were investigated at two sites from 1991 to 1994. Crop rotations were continuous corn, continuous soybean, corn–soybean, and corn–tomato–soybean. Herbicide programs were the split-plots and included continuous use of acetolactat ...
DOI:
10.1614/0043-1745(2002)050[0112:MPACRI]2.0.CO;2

10. Pitted morningglory interference in drill-seeded glyphosate-resistant soybean

Author:
Norsworthy, Jason K.; Oliver, Lawrence R.
Source:
Weed science 2002 v.50 no.1 pp. 26-33
ISSN:
0043-1745
Subject:
Glycine max; Ipomoea lacunosa; field experimentation; glyphosate; heat sums; herbicide resistance; leaf area index; photosynthesis; seed yield; seeds; shade; sowing; soybeans; weed science
Abstract:
... Field experiments were conducted from 1997 through 1999 to evaluate interspecific interference between pitted morningglory at 0, 10, 16, and 62 plants m⁻⁻² and drill-seeded, glyphosate-resistant soybean as influenced by soybean population and a single glyphosate application of 1.12 kg ai ha⁻⁻¹. Photosynthetic rate of soybean was not influenced by pitted morningglory density or glyphosate use 2 wk ...
DOI:
10.1614/0043-1745(2002)050[0026:PMIIDS]2.0.CO;2