Weed Science

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Regional Mapping of Perennial Weeds in Cotton with the Use of Geostatistics
Weed Science - Tập 60 Số 2 - Trang 233-243 - 2012
Dionissios Kalivas, Christos Vlachos, Garifalia Economou, Paraskevi Dimou
Perennial weeds constitute a serious problem in Greek cotton-growing areas, as they strongly competing against the crop and downgrade the final product. Monitoring weeds at a regional scale and relating their occurrence with abiotic factors will assist in the control of these species. Purple nutsedge, field bindweed, bermudagrass, and johnsongrass were studied in cotton crops for three con...... hiện toàn bộ
Effects of Field Applications of Nitrate on Weed Seed Germination and Dormancy
Weed Science - Tập 26 Số 6 - Trang 594-596 - 1978
R. S. Fawcett, F. W. Slife
Application of 112 to 336 kg/ha N as ammonium nitrate [NH4(NO−3)] failed to affect population numbers of common lambsquarters(Chenopodium albumL.), giant foxtail(Setaria faberiHerrm.), velvetleaf(Abutilon theophrastiMedic.), jimsonweed...... hiện toàn bộ
Using Assembly Theory to Explain Changes in a Weed Flora in Response to Agricultural Intensification
Weed Science - Tập 58 Số 1 - Trang 39-46 - 2010
Jonathan Storkey, S. R. Moss, J. Cussans
The intensification of crop management in the U.K. over the past 60 years has resulted in the decline of the populations of a number of annual plant species adapted to arable habitats. In contrast, other species continue to be common as arable weeds. A community assembly approach was taken to explain these recent changes in the weed flora using databases of plant functional traits, a pot e...... hiện toàn bộ
Seed Composition of 66 Weed and Crop Species
Weed Science - Tập 22 Số 4 - Trang 345-348 - 1974
Mark A. Schroeder, József Deli, E D Schall, G. F. Warren
The percentage composition of fat, protein, nitrogen-free extract (NFE), fiber, and ash was determined for 50 weed and crop species. Data on 16 additional species were compiled from the literature. Generally, within a family there was a tendency toward a certain type of storage material. Seeds of the Polygonaceae and Gramineae were low in fat, high in NFE and, with few exceptions, low in p...... hiện toàn bộ
Factors Influencing the Phytotoxicity and Movement of Paraquat in Quackgrass
Weed Science - Tập 16 Số 1 - Trang 80-83 - 1968
A. R. Putnam, S. K. Ries
Quackgrass (Agropyron repens (L.) Beauv.) was defoliated for 25 to 30 days with applications of 1.0 lb/A of l,l′-dimethyl-4–4′-bipyridinium salt (paraquat). Applications were more effective made prior to darkness than at midday. Phytotoxicity was increased by adding surfactants in the field, and experiments utilizing 14C-paraquat under contro...... hiện toàn bộ
Interactions of Herbicides with Photosynthetic Electron Transport
Weed Science - Tập 39 Số 3 - Trang 458-464 - 1991
E. Patrick Fuerst, Michael Norman
The two primary sites of herbicide action in photosynthetic electron transport are the inhibition of photosystem II (PS II) electron transport and diversion of electron flow through photosystem I (PS I). PS II electron transport inhibitors bind to the D1 protein of the PS II reaction center, thus blocking electron transfer to plastoquinone. Inhibition of PS II electron transport prevents t...... hiện toàn bộ
Effects of canopy shade on the morphology, phenology, and seed characteristics of Powell amaranth (Amaranthus powellii)
Weed Science - Tập 53 Số 2 - Trang 175-186 - 2005
Dan C. Brainard, Robin R. Bellinder, Antonio DiTommaso
Inhibition of Velvetleaf (Abutilon theophrasti) Germination and Growth by Benzyl Isothiocyanate, a Natural Toxicant
Weed Science - Tập 32 Số 5 - Trang 612-615 - 1984
Rebecca B. Wolf, Gayland F. Spencer, W. F. Kwolek
Benzyl isothiocyanate (BITC) was extracted from mature papaya (Carica papayaL.) seeds and applied to imbibed velvetleaf (Abutilon theophrastiMedic. ♯3ABUTH) seeds. Complete inhibition of germination occurred at a concentration of 6 × 10-4M BITC, and only 28% (compared to controls) of the seeds g...... hiện toàn bộ
Microbial degradation of imazaquin and imazethapyr
Weed Science - Tập 45 Số 4 - Trang 586-591 - 1997
Jerry L. Flint, William W. Witt
Laboratory studies were conducted to investigate the processes of imazaquin and imazethapyr degradation in soil. Microbial degradation of14C-imazaquin and14C-imazethapyr was monitored by measuring14CO2evolution compared to nonsterile soil.14CO2evolution was greatest...... hiện toàn bộ
Mefluidide Effects on Growth of Corn (Zea mays) and the Synthesis of Protein by Cucumber (Cucumissativus) Cotyledon Tissue
Weed Science - Tập 25 Số 4 - Trang 360-363 - 1977
Bryan Truelove, Don E. Davis, C. G. P. Pillai
Mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl) sulfonyl]amino] phenyl] acetamide} at concentrations of 2.9 × 10-4M and above retarded the growth of corn (Zea maysL. ‘Pioneer 3369A’) grown in nutrient culture. Dwarfing was accompanied by some plant distortion and chlorosis of the bases of those leaves formed soon ...... hiện toàn bộ
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