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Full-Text Articles in Life Sciences
Factors Affecting The Realized Niche Of Common Sunflower (Helianthus Annuus) In Ridge-Tillage Corn, Michael G. Burton, David A. Mortensen, David B. Marx, John L. Lindquist
Factors Affecting The Realized Niche Of Common Sunflower (Helianthus Annuus) In Ridge-Tillage Corn, Michael G. Burton, David A. Mortensen, David B. Marx, John L. Lindquist
Department of Agronomy and Horticulture: Faculty Publications
Because soil characteristics and weed densities vary within agricultural landscapes, determining which subfield areas are most favorable to weed species may aid in their management. Field and greenhouse studies were conducted to determine whether subfield environments characterized by higher soil organic carbon (SOC), or ridge vs. furrow microsites, affect common sunflower seed germination after winter burial, seedling emergence, or the control afforded by a preemergence herbicide in a ridge-tillage corn production system. Among seeds buried in situ during winter months and germinated in the laboratory, no differences in common sunflower seed germination or mortality were detected between high-SOC (1.8% mean) …
Suppression Of Smooth Brome By Atrazine, Mowing, And Fire, Gary D. Willson, James L. Stubbendieck
Suppression Of Smooth Brome By Atrazine, Mowing, And Fire, Gary D. Willson, James L. Stubbendieck
Department of Agronomy and Horticulture: Faculty Publications
Burning and mowing were evaluated in 1989-1991 at Pipestone National Monument, Minnesota, as alternatives to atrazine to suppress smooth brome (Bromus inermis Leyss.) and to affect seeding success of big bluestem (Andropogon gerardii Vitman). Atrazine was the only treatment that significantly reduced smooth brome tiller density (-77% 1990; -70% 1991) as compared to unburned controls. Neither burning (-16% 1990; -37% 1991) nor mowing (-16% 1990; +10% 1991) resulted in significant reductions. Sod-seeded big bluestem failed in all treatments in both years. The failure of chemical and non-chemical management to affect sufficient smooth brome control for big bluestem seeding …
Weed Suppression With Grazing Or Atrazine During Big Bluestem Establishment, B. Keith Lawrence, Steven S. Waller, Lowell E. Moser, Bruce Anderson, Larry L. Larson
Weed Suppression With Grazing Or Atrazine During Big Bluestem Establishment, B. Keith Lawrence, Steven S. Waller, Lowell E. Moser, Bruce Anderson, Larry L. Larson
Department of Agronomy and Horticulture: Faculty Publications
Weed competition is a major factor causing warm-season grass seeding failures in rangeland and cropland. With a limited number of herbicides available for weed control, grazing may reduce competing vegetation in seedings and serve as an alternative to herbicides. Many immature needy forbs and grasses are palatable to cattle and contain high nutrient levels. Research was conducted (RCBD, 4 reps) comparing grazing by yearling cattle with chemical suppression [atrazine (6-chloro-N-ethyl-N’- (methylethyl)-1, 3, 5-triazine-2, 4-diamine)] for weed control in big bluestem (Andropogon gerardii var. gerardii Vitman) seedlings at Mead, Nebr. on a Sharpsburg silty clay loam (fine, montmorillonitic, mesic Typic …
Sod-Seeding Perennial Grasses Into Eastern Nebraska Pastures, John F. Sampson, Lowell E. Moser
Sod-Seeding Perennial Grasses Into Eastern Nebraska Pastures, John F. Sampson, Lowell E. Moser
Department of Agronomy and Horticulture: Faculty Publications
Eastern Nebraska and neighboring areas have large amounts of depleted pastures which consist of annual bromegrasses (Bromus spp.), Kentucky bluegrass (Poapratensis L.), and numerous broadleaf weeds. Such pastures need renovation but complete seedbed preparation is expensive and may enhance erosion. The objective of our study was to determine if sod-seeding grasses offered an alternative to complete seedbed preparation. Three weedy pastures in southeast Nebraska on a Hastings silty clay loam (fine, montmorillonitic, mesic Udic Argiustoll), a Lamo silty clay loam [fine-silty, mixed (calcareous), mesic Cumulic Haplaquoll], and a Geary silty clay loam (fine-silty, mixed, mesic Udic Argiustoll) were …