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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.