An aqueous solution of technical glyphosate [N-(phosphonomethyl)
glycine] was applied in homogeneous sprays of 120, 180 and 300 μm
droplets to seedlings of a bush type green bean (Phaseolus vulgaris
L. 'OSU 1604') at a carrier rate of 20 1/ha. At each droplet size
all combinations of 3 dosage levels...
Bean shoot parts that respond to glyphosate (N-
(phosphonomethyl)glycine) in ways useful for bioassay were determined
by applying glyphosate doses of 3.8 to 60.3 ug ae per plant to the
simple leaves when the first trifoliolate leaflets were about 1 cm
long. Dry weights of parts that were almost fully...
Two experiments were conducted on wine grapes 'Chardonnay' and
'Gewurtztraminer' (Vitis vinifera L.) in 1986 and 1987 to
investigate the performance of grapes in competition with perennial
ryegrass (Lolium perenne L.) 'Manhattan 11' sod, the competition
between sod and grapes for nutrients and moisture and the effects
of nitrogen fertilization...
In onions, sensitive cultivars diminish the usefulness of the selective
herbicide bromoxynil. Tolerant cultivars can overcome this limitation. A better
understanding of the biochemistry, physiology and genetics of bromoxynil
tolerance could lead to improved weed control programs in onions.
Onion cultivar response to bromoxynil was studied under greenhouse
conditions. Tolerant...
Studies with fluorodifen were conducted to gain more information
about its field performance and the influence of light quantity,
quality and timing of exposure on its phytotoxic properties. Uptake
and trans location in three plant species were also investigated.
These studies were aimed at evaluating the usefulness of this chemical...
Chemicals are being sought that can control weeds in lettuce
under different environmental conditions, soil types and weed populations.
The extensive or repeated use of a herbicide may lead to important
changes in the weed population which call for new materials
that can take care of the modified situation.
In...
Experiments were conducted to determine if allelopathy is a mechanism
by which buckwheat interferes with a) the growth of Canada thistle and/or b)
mycorrhizae colonization in Canada thistle roots. In a competition experiment,
buckwheat plant biomass was only affected by the intraspecific competition
from other buckwheat plants and not by...
Most of the presently grown cultivars of rice (Oryza sativa L.) have poor
competitive ability against weeds if compared with traditional cultivars. Therefore,
effective weed control is an important but often costly and difficult management
practice in rice crop production. If weed competitive ability of rice cultivars could be
improved...
Purple nutsedge [Cyperus rotundas L.) has been recognized as one of the
most troublesome perennial weeds of agricultural lands in tropical and some
temperate regions. This research sought to determine the effects of timing of
herbicides, shading, and soil moisture on plant population growth and tuber
production of purple nutsedge...