Radiometry accurately measures chlorsulfuron injury to barley [Hordeum vulgare]
1993
Lemerle, D. | Fisher, J.A. | Hinkley, R.B. (New South Wales Agriculture, Wagga Wagga (Australia). Agricultural Research Inst.)
Chlorsulfuron was applied post-emergence to 4 barley cultivars sown at the end of May (sowing date 1, SD1) and mid June (SD2) in weed-free field trials. Chlorsulfuron significantly reduced dry matter (DM), leaf area index (LAI) and tillering as measured by destructive harvests between the three-leaf stage and anthesis, from both SD1 and SD2, and there was no significant interaction between cultivar and herbicide treatment. The interaction between cultivar and chlorsulfuron was marginally significant for LAI as measured by the radiometer (LAI-R) from SD2. The radiometer showed potential as a rapid, non-destructive and inexpensive method for measuring crop damage caused by herbicides. The effect of chlorsulfuron on grain yield depended significantly on the cultivar. At SD1, chlorsulfuron reduced grain yield of Schooner to 54 percent of untreated controls and Clipper to 66 percent, compared with the more tolerant Grimmett (83 percent) and Lara (76 percent). Similar but smaller responses were measured from SD2. Kernel number per sq m was the most important determinant of yield reflecting the early effect of the herbicide on crop growth.
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