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Temperature effects on germination of nine Amaranthus species
Germination of weed seed and time of emergence are greatly affected by temperature, and alternating temperature regimens increased total germination of all species, except Powell amaranth, which germinated similarly under both constant and alternating temperatures.
Light Penetration and Light-induced Seed Germination in Soil.
Light penetration through a Drummer silty clay loam and a Broomfield sand and biological measurements with light-sensitive lettuce seeds in soil showed that an exposure to light equivalent to about 1 sunny day induced some germination of seeds which were 2 millimeters below the surface, but did not affect seeds 6 millimetersbelow the surface.
A biotype of common waterhemp (Amaranthus rudis) resistant to triazine and ALS herbicides
Resistance to atrazine and three ALS-inhibiting herbicides in this common waterhemp biotype was determined and regions of the genes encoding ALS and DI proteins were sequenced to determine the molecular basis for the resistances.
Interference of Four Annual Weeds in Corn (Zea mays)
Season- long interference of shattercane, giant foxtail, common cocklebur, and common lambsquarters in corn was evaluated in the field at weed densities from 0.4 to 13.1 plants or clumps/m of corn
Common waterhemp (Amaranthus rudis) interference in soybean
It is suggested that soybean producers should implement common waterhemp management strategies earlier than 4 wk after soybean unifoliolate leaf expansion in order to reduce the potential loss of soybean seed yield.
Tillage, Cropping System, and Soil Depth Effects on Common Waterhemp (Amaranthus rudis) Seed-Bank Persistence
Abstract A field experiment was conducted in Urbana, IL, from 1997 to 2000 to evaluate the effect that crop, tillage, and soil depth have on common waterhemp seed-bank persistence. A heavy field
Biology and Life Cycle of Purple and Yellow Nutsedges ( Cyperus rotundus and C. esculentus )
Yellow and purple nutsedges are herbaceous perennial weeds that are among the worst pests known and both weeds infest crop production areas in tropical and temperate climates, causing large losses in crop yields.