Weed Science

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CO2Compensation Concentration, Rate of Photosynthesis, and Carbonic Anhydrase Activity of Plants
Weed Science - Tập 18 Số 3 - Trang 399-403 - 1970
Tsong Meng Chen, R. H. Brown, Clanton C. Black
Leaves of a number of plant species were surveyed for their CO2compensation concentration which is one of the distinguishing characteristics used to classify plants on the basis of their photosynthetic capacity. Monocot genera with low CO2compensation values are mainly limited to tribes of Chlorideae, Paniceae, Andropogoneae, Tripsaceae, and a part...... hiện toàn bộ
Leaching of Dichlorprop, Bentazon, and36Cl in Undisturbed Field Lysimeters of Different Agricultural Soils
Weed Science - Tập 41 Số 2 - Trang 251-261 - 1993
Lars Bergström, Nicholas Jarvis
A leaching test conducted in field lysimeters for the purpose of pesticide registration is evaluated, particularly in terms of factors such as the effects of soil type, variability in leaching between replicate lysimeters, and simulation of worst-case scenarios. Two herbicides, dichlorprop and bentazon, were chosen as test compounds due to their documented high mobility in laboratory tests...... hiện toàn bộ
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
Weed Survey System used in Saskatchewan for Cereal and Oilseed Crops
Weed Science - Tập 33 Số 1 - Trang 34-43 - 1985
A. Gordon Thomas
A weed survey system methodology was developed and used annually for 4 yr in the province of Saskatchewan. Based on a stratified random sampling procedure, fields were selected in wheat (Triticum aestivumL.), barley (Hordeum vulgareL.), oat (Avena sativaL.), rye (Secale cerealeL.), r...... hiện toàn bộ
Relationship between temperature and the early growth ofTriticum aestivumand three weed species
Weed Science - Tập 48 Số 4 - Trang 467-473 - 2000
Jonathan Storkey, J. Cussans
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
Seedling recruitment pattern and depth of recruitment of 10 weed species in minimum tillage and no-till seeding systems
Weed Science - Tập 54 Số 4 - Trang 658-668 - 2006
Bhagirath Singh Chauhan, Gurjeet Gill, Christopher Preston
Differences in periodicity and depth of weed seedling recruitment due to agronomic management practices, such as reduced tillage, have implications for weed competitive ability and management strategies. Periodicity and depth of seedling recruitment of 10 different weed species was measured in the field in 2004 and 2005. The seedling recruitment of rigid ryegrass, threehorn bedstraw, and w...... 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
Integrating measurements of seed availability and removal to estimate weed seed losses due to predation
Weed Science - Tập 54 Số 3 - Trang 566-574 - 2006
Paula R. Westerman, Matt Liebman, Andrew H. Heggenstaller, Frank Forcella
Tổng số: 40   
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