No-tillage winter wheat (Triticum aestivum L.) grown in a
wheat-fallow cropping system has consistently produced lower grain
yields than conventionally tilled soils in the semiarid Pacific
Northwest. A 2-year study was conducted in a long-term tillage trial
at Moro, OR to determine factors responsible for differences in wheat
growth and...
The CERES-Wheat Crop Growth and Development model treats temperature,
nitrogen and water stresses as limiting factors. For each day the model calculates a
stress index for temperature, N and water, compares the magnitude of the indices,
and then adjusts the calculated daily potential growth using the index of the most...
The semi-arid regions of the Pacific Northwest are
characterized by a high degree of annual temperature and
precipitation variation. As a result of this climatic
variation, dryland nitrogen fertilizer trials on fallow-
,wheat rotations typically demonstrate a variable response.
Wheat growers in the area must not only cope with this...
The effect of four basic liquid fertilizers: Solution 32, 10-34-0-.9, Thio-Sul, and Potash solution; and one commercial liquid fertilizer, Feast 9-18-9, on germination, emergence, and seedling growth of wheat (Triticum aestivum L.) were evaluated under laboratory, greenhouse, and field conditions. Experiments included: 1) preliminary study of basic fertilizer sources to...
Effects of different tillage systems on nitrate-nitrogen
accumulation in a 120 cm profile and on soil structure in the top 30 cm
of the profile were studied under a fallow-wheat rotation.
Treatment effects on nitrate-nitrogen, soil moisture and soil
aggregation were measured.
Fallow tillage treatments consisting of bare fallow, stubble-mulch...
Hard red winter wheat has the potential to be an alternative crop
in the Pacific Northwest, however percent grain nitrogen has been
unacceptably low and grain yields have been about only 80% of soft white
winter wheat. During the late spring and the summer months there is
usually little rainfall,...
Downy brome (Bromus tectorum. L.), a serious grass weed in eastern Oregon can be partially controlled in wheat by metribuzin [4-amino-6-tertbutyl- 3-(methylthio)-as triazin -5(4H)-one]. However, cultivars of many crops Lave been reported to differ in their level of tolerance to metribuzin. This lack of tolerance has led to the investigation...
Rate of emergence is an important character for stand
establishment. Ability of wheat seeds to germinate and
emerge rapidly under different climatic conditions may be
regulated by physical and/or physiological characteristics.
Seeds of 26 wheat varieties representing five classes
were produced in two different environments (Moro and Corvallis,
OR). Seed...
Farmers and researchers are aware of spatial variation in
grain yield within farms or fields. Fertilizer management may be
improved if techniques can be developed to identify grain yield
variations in wheat fields. Aerial color infrared (CIR)
photography was used to identify winter wheat (Triticum aestivum
L.) canopy biomass variability...