Graduate Thesis Or Dissertation

 

Influence of lime on Italian ryegrass control in winter wheat with five herbicides Public Deposited

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  • Liming has been shown to increase the activity of certain soil-applied herbicides. One research worker reported improved weed control with diuron after lime had increased soil pH levels. This could be caused by improved competitive ability of the wheat, greater availability of the herbicide, or a combination of the two factors, Field studies were conducted at two locations to determine the effect of three lime rates on wheat growth alone, on ryegrass growth alone, and on ryegrass control from five herbicides. Lime rates were 0, 4.5, and 9.0 t/ha, giving an approximate pH range from 5. 0 to 6.1. Herbicides used were trifluralin, triallate, diclofop, rnetribuzin, and diuron, each applied at three rates. Diuron at eight rates was also studied in the greenhouse at five rates of lime. All of the herbicides in the field studies caused large increases in wheat grain yield when compared to untreated ryegrass-infested wheat. However, liming had no effect on ryegrass growth nor activity of the herbicides and, except in one case, no effect on wheat growth. The high rate of metribuzin, 1.12 kg/ha, caused severe wheat injury at one location but only minor injury at the other. The other herbicides caused little or no injury even at double the commercial rate. In one greenhouse experiment, application of lime increased ryegrass growth but did not affect diuron activity. In the other experiment, lime alone did not influence ryegrass growth but tended to increase diuron activity at the 4.5 t/ha lime rate. The application of lime is not expected to have wide-spread effects on weed control in winter wheat in western Oregon, at least with the five herbicides tested in these studies.
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