Weed Science
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Seed Composition of 66 Weed and Crop SpeciesThe 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... ...
Weed Science - Tập 22 Số 4 - Trang 345-348 - 1974
Factors Influencing the Phytotoxicity and Movement of Paraquat in QuackgrassQuackgrass (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 14 C-paraquat under contro... ...
Weed Science - Tập 16 Số 1 - Trang 80-83 - 1968
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
Use of Empirical Equations to Describe Dissipation of Metribuzin and PendimethalinFour equations were evaluated as predictors of the rate of herbicide dissipation in soil. A biexponential equation was superior to the first-order equation for metribuzin and pendimethalin dissipation under five moisture levels and three temperatures in laboratory and field studies. The Hoerl function, adapted in the course of this work, is also a good descriptor. The first-order equation ... ...
Weed Science - Tập 42 Số 2 - Trang 241-248 - 1994
Arsenical Herbicides for Removing Broomsedge from Forage GrassesMSMA (monosodium methanearsonate) and DSMA (disodium methanearsonate) killed 27 to 90% of the broomsedge (Andropogon virginicus L.) plants when applied at 1.1 to 6.7 kg/ha in July. These rates did not reduce yields of smooth bromegrass (Bromus inermis Leyss.) or affect the density of Kentucky bluegrass (Poa pratensis
Weed Science - Tập 23 Số 3 - Trang 222-223 - 1975
Competitive and Allelopathic Effects of Sunflower (Helianthus annuus)In the field, soybeans [Glycine max (L.) Merr. ‘Amsoy 71′] required 4 to 6 weeks free of sunflower (Helianthus annuus L.) competition for maximum yield. Competition studies suggested that more than one type of interference was involved when sunflowers grew with soybeans. In greenhouse studies, soybean height, fresh weight, and dry weight ... ...
Weed Science - Tập 30 Số 4 - Trang 372-377 - 1982
Biochemical Basis for Plant CompetitionA survey has been made of the literature on biochemical characteristics of plants with particular emphasis on factors affecting photosynthesis. From these characteristics, plants have been divided into two groups, efficient and non-efficient. This division is justified on the basis of data published by numerous workers. A hypothesis has been developed that efficient plants often have been ... ...
Weed Science - Tập 17 Số 3 - Trang 338-344 - 1969
Mechanisms of Herbicide Absorption Across Plant Membranes and Accumulation in Plant CellsIn most cases, a herbicide must traverse the cell wall, the plasma membrane, and organellar membranes of a plant cell to reach its site of action where accumulation causes phytotoxicity. The physicochemical characteristics of the herbicide molecule including lipophilicity and acidity, the plant cell membranes, and the electrochemical potential in the plant cell control herbicide absorption... ...
Weed Science - Tập 42 Số 2 - Trang 263-276 - 1994
Physiological Response of Different Croftonweed (Eupatorium Adenophorum) Populations to Low Temperature
Weed Science - Tập 56 Số 2 - Trang 196-202 - 2008
Tổng số: 40
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