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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"preemergence"”.
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Controlled-Release Preemergence Herbicide Formulations for Annual Grass Control in Kentucky Bluegrass Turf
Field, greenhouse and laboratory studies were conducted to evaluate the performance of starch xanthide (SX) sludge polymer (SP) and commercial formulations of benefin (N-butyl-N-ethyl-(alpha),(alpha),(alpha)-trifluoro-2,6-dinitro-p-toluidine), oxadiazon …
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Managing Cereal Rye Living Mulch in Snap Beans with Chemical Mowing and Preemergence Herbicides
… snap bean yield, and cereal rye dry weight. Preemergence herbicide use could provide cereal rye with a temporal emergence advantage over annual weeds. Cereal rye tolerated the low-label rate of S-metolachlor, dimethenamid-p, pendimethalin, and EPTC applied preemergence. These results will …
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Preemergence activity of chloroacetamide herbicides on a multiple herbicide-resistant population of waterhemp (amaranthus tuberculatus)
… herbicides have been an integral part of preemergence (PRE) weed management programs in corn and soybean since their discovery in the 1950’s. Today they are applied either alone, or with other active ingredients in herbicide premixes. Known as ‘Old Chemistries’, their importance is due to …
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Evaluation of Preemergence and Postemergence Herbicide Systems and Physiological Behavior of CGA-362622 on Purple and Yellow Nutsedge (Cyperus rotundus L. and C. esculentus L.)
… preplant incorporated (PPI) in tobacco or preemergence (PRE) in glyphosate-resistant (GR) soybean reduced yellow nutsedge densities 82 and 99%, respectively. Postemergence (POST) treatments of glyphosate in GR soybean did not increase yellow nutsedge reductions when sulfentrazone was …
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Efficacy and selectivity of the herbicide rimsulfuron in potatoes [Solanum tuberosum], transplanted tomatoes [Lycopersicum esculentum], and transplanted peppers [Capsicum annum]
… by E.I. Dupont de· Nemours & Company Inc. for preemergence and postemergence grass and broadleaf weed control in Solanaceous vegetable crops. The efficacy and selectivity of rimsulfuron were determined in potatoes, transplanted tomatoes, and transplanted peppers in field studies in 1991, 1992, …
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Field and laboratory investigations on the efficacy, selectivity, and action of the herbicide clomazone
… the efficacy of clomazone as a preplant and preemergence herbicide. Clomazone applied preemergence provided large crabgrass (Digitaria sanguinalis L.) control equivalent to that of oryzalin applied preplant or preemergence and provided better control of several broadleaf weeds. Control from …
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Efficacy of Hercides for weed control in soyabean(glycine max)under a no-Tillage cultivation system in Zambia
… were used in this study. These include four preemergence, five postemergence and combinations of these herbicides. They were compared with hand hoe weeding (14 and 28 days after planting) and no weeding. The seedbed was prepared by two applications of 0.6 kg a.i/ha paraquat before planting …
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Double-crop corn (zea mays) weed control in Virginia
… herbicides for no-till establishment and/or preemergence residual herbicides and/or selective postemergence herbicides in both production systems. Glyphosate-tolerant corn was planted in all experiments and postemergence glyphosate treatments were also evaluated. In each experiment, dependent …
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Studies on the Herbicidal Properties of Sn 533 (Epronaz) (1- (n-Ethyl- N-Propylcarbamoyl) -3-Propyl-Sulphonoyl) -1,2,4-Triazole) and Its Uptake, Translocation and Metabolism by Soybeans and Peanuts
… purpose of this study was to evaluate SN 533 for preemergence and postemergence herbicidal activity, and to determine its fate in soybeans (Glycine max L.) and peanuts (Arachis hypogea L.).
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Studies on the Use of Herbicides for Control of Wild Garlic (Allium Vineale L.) in a Winter Wheat-Soybean Double Crop Rotation (Chlorsulfuron, Dpx T6376)
… experiments, chlorsulfuron was applied preemergence, and postemergence, in early fall, late fall, early spring and late spring. All treatments reduced aerial and underground bulb production, but spring applications were much more effective than preemergence, or postemergence, fall …
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Evaluation of Crop Tolerance and Weed Control in Corn and Grain Sorghum with Atrazine Replacements
… while atrazine may be an effective herbicide for preemergence and postemergence control of weeds, it also has risks. The low Koc of atrazine as well as its extensive use over the past 50 years have led it to become the most common groundwater contaminant near agricultural soils. Given these …
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The biology and management of Palmer amaranth (Amaranthus palmeri S. Wats) in Indiana
… technologies mixed with one or more additional preemergence herbicides were more effective than applying herbicides with a single active ingredient. Soybean yield is compromised by Palmer amaranth competition without the use of residual preemergence and overlapping preemergence residual plus …
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Weed control in no-till corn as affected by cultivation, herbicide banding, and cover crop suppression
… included a control or no selective herbicides, a preemergence herbicide combination of atrazine plus metolachlor, and a postemergence herbicide combination of dicamba plus nicosulfuron. The preemergence and postemergence herbicides were applied either broadcast or banded over the crop row. The use …
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Control, Assessment and Glyphosate Resistance of Palmer Amaranth (Amaranthus palmeri S. Wats) in Virginia
… a hot and dry year. Glyphosate applied after preemergence (PRE) herbicides improved control to 90 percent. Programs that included s-metolachlor + metribuzin applied preemergence and followed by glyphosate + fomesafen applied postemergence provided the best control (93%) at 8 WAP. Glufosinate …
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Weed Control in Cucumber Cucumis sativus, Pumpkin Cucurbita maxima, and Summer Squash Cucurbita pepo with Halosulfuron
… yellow summer squash at 4, 9, 18, and 27 g ai/ha preemergence (PRE) and postemergence (POST) in combination with clomazone at 174 g ai/ha plus ethalfluralin applied PRE at 630 g/ha. Crop injury, weed control, and crop yield was collected from the field studies. Weed control by halosulfuron was …
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Weed control efficacy and biodegradation characteristics of imazethapyr
… ai/ha was applied preplant incorporated (PPI), preemergence (PRE), or postemergence (POST). Imazethapyr controlled 90% or more smooth pigweed (Amaranthus hybridus) regardless of application method or herbicide rate. Imazethapyr control of jimsonweed (Datura stramonium) at 0.5 kg/ha was 30% …
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Screening of herbicides for selective weed control in African marigold (Tagetes erecta)
… erecta L.) was screened for tolerance to preemergence and postemergence herbicides. Three preemergence herbicides, pendimethalin, bensulide, and trifluralin, had an acceptable margin of crop safety both in the greenhouse and in the field when applied at one, two, and four times their …
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Absorption, distribution and metabolism of bifenox
… in soil and plants following preemergence application of this herbicide, was investigated in greenhouse and laboratory studies. Radiolabeled ¹⁴C-bifenox had a half-life of 3 to 7 days after application to the soil and was characterized by hydrolysis to …
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Interference and control of sharppod morningglory (Ipomoea cordatotriloba dennstedt) in glyphosate-resistant cotton.
… to roots. Rotation to corn and the use of preemergence herbicides in cotton improved control of grass and broadleaf weeds during the year of treatment. In the season following the 3-yr rotation, there were no lasting effects of crop rotation on density or control of grasses and broadleaves. …
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Reduced Chemical Weed Control Options in Virginia for Corn and Turfgrass and Characterization of Sorghum halepense Expressing Multiple Resistance to Nicosulfuron and Glyphosate
… crop residues, combined with reduced rates of preemergence herbicide and postemergence glyphosate applications, were shown to provide sufficient weed control and corn yield. Cover crop type or residue level did not augment weed control in corn production systems, but the use of glyphosate was …
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