Browse on keywords: weed OR
Search results on 05/21/13
2918. Idaho Agr. Expt. Sta.. 1950. Annual Report. Id Agr. Expt. Sta. Bull. #280.
T: hay yields, economics
5500. Radosovich, Stephen. 1990. presentation at the Farming for Profit and Stewardship Conference, Vancouver, WA Mar. 2-3, 1990. Forest Science Lab, Oregon State Univ., Corvallis, OR 97331.
Dr. Radosovich, a researcher at OSU, described work with non-chemical weed control in ryegrass. He is exploring the effect of planting geometry on weeds. A square arrangement was almost 10 times more competitive than a rectangle for the crop. Tilling the soil at night changed the weed spectrum and the % germination, due to phytochrome response. Light quality can be manipulated by crop or residue canopy to alter the amount of red light hitting the soil. This might affect plant competitiveness. Use plants as a "green filter". Plant a cover crop early, filter out red light, plant the crop, frost will kill the cover crop. Also, seeding at night, less weed germination triggered, and moisture comes up in deep furrows. Need to look at light intensity, light quality, and light reflectance, especially the red:far red ratio. This can also affect insect behavior.
5539. Ramig, R.E.. 1987. Conservation tillage systems for green pea production in the Pacific Northwest.. IN: J.F. Power (ed.). The role of legumes in conservation tillage systems. p. 93-94.
Summarizes a 13 yr study of the effects of 4 tillage systems in a pea-winter wheat cropping system on water conservation and use, yields, water use efficiency, and the changes in weed populations. Water storage on land on which wheat stubble was left standing overwinter averaged 10% more than on fall-tilled stubble. There were no significant differences in wheat yields among tillage systems. Weed infestations in peas shifted due to tillage, primarily with lambsquarters. Spring plow was worst. Conservation tillage for a wheat-pea rotation can enhance water conservation, and in dry years can increase pea yields by 20% and wheat yields by 5%. Long-term effects are not consistent due to crop residue influences.
5735. Rasmussen, P.E. and C.R. Rohde. 1988. Stubble burning effects on winter wheat yield and N utilization under semiarid conditions.. Agronomy J. 80:940-942.
Burning vs. not burning was examined at 3 nitrogen levels over 6 years (3 crops). Burning had no effect on grain yield or grain N uptake. Burning increased straw yield when wheat was fertilized by N, but had no effect on straw N uptake. Burning did not decrease foot rot incidence or severity, but did reduce downy brome density. T: Effects of stubble burning and N fertilization on grain and straw of winter wheat 1980-85. Effect of stubble burning on foot rot infection. Effect of stubble burning on downybrome infestation.
6019. Rydrych, D.J.. 1981. Corn cockle (Agrostemma githago) competition in winter wheat (Tritcum aesativum).. Weed Sci., 29(3):360-363.
Reductions in yield of wheat if weeds were not removed before February of each year in winter wheat that had been seeded the previous October. Bomoxynil controlled more weed plants when applied on corn cockle that had less than four leaves. Winter annual with large, showy, purple flowers; this weed was not abundant in eastern OR before 1960, but has increased because it is resistant to herbicides used for weed control and because of the contamination of farm seeds. It is resistant to 2,4-D and MCPA. New cultural practices such as no-till, trashy fallow, or minimum tillage favor the establishment of this weed.
9790. Lee, O.C.. 1928. The wild morning glory: response to various herbicides and cultivation methods.. M.S. thesis, Washington State Collge, Pullman, WA.
10652. Chaney, D.. 1991. Marine by-products as fertilizers.. Components, UC Sustainable Agr. Program, Davis, CA (Winter 1991), p. 12-13.
Research and field experience indicate that marine by-products can improve soil structure, enhance soil microbial activity, and promote plant growth. Current processing and distribution costs presently limit their use. Fish waste, fish emulsion, shellfish waste, and seaweed are the major classes of materials. Research has established that seaweed supplies some plant nutrients (especially micronutrients), enhances plant growth, and improves soil tilth.
10776. Rydrych, D.J.. 1990. A summary of jointed goatgrass cultural and chemical control in wheat - 1990.. 1990 Columbia Basin Agricultural Research, Special Report 860, Corvallis, OR. p. 49-51.
Present herbicide options for controlling jointed goatgrass in wheat are not effective. Potential cultural controls include crop rotation, spring crops, perennial crops, double fallow, and field burning. The most effective cultural control is spring planted crops. Double fallow has provided 92% control without selective herbicides. Herbicides plus no-till have been 98% effective.