Herbicidal effectiveness of trifluralin as influenced by methods of incorporation into the soil and depth of weed seed germination Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/kk91fn99n

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  • This study was conducted to compare the effectiveness of four methods of incorporating the herbicide trifluralin into the soil, and to determine the interaction between depth of incorporation of trifluralin and depth of weed seed germination. Field experiments on green and dry peas were established in Oregon and Idaho. Trifluralin, applied at four rates, was incorporated by a rototiller, tine-tooth harrow, spike-tooth harrow or double-disked, prior to planting. At time of harvest, yields were taken and plots were evaluated for weed control. On dry peas, only the tine-tooth harrow gave unsatisfactory incorporation of trifluralin. Increasing the rate of trifluralin, regardless of the method of incorporation, reduced the yield of dry peas, indicating injury. On green peas, both the double-disk and rototiller satisfactorily incorporated trifluralin. However, yields from the rototiller plots were slightly less than those from the disk plots. No injury was noted with increasing rates of trifluralin. Greenhouse experiments were conducted at Corvallis to determine the effect of increasing the depth of incorporation and depth of weed seed germination on the herbicidal activity of trifluralin. Trifluralin, applied at three rates, was incorporated to four depths and planted at three depths to pigweed (Amaranthus retroflexus L.) and barnyardgrass (Echinochloa crusgalli (L.) Beauv.). Pigweed was not affected when planted below the trifluralin-treated zone. Only pigweed plants whose roots grew into the trifluralin were controlled. Shoot uptake appeared to be more effective than root uptake by barn-yardgrass. When trifluralin was incorporated over 1.5 inches, weed control was reduced, indicating a dilution effect. Results of this study indicate that the weed species to be controlled will be of major importance when determining the depth and method of incorporation of trifluralin.
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