Failure of liming to increase grain yield of wheat and triticale in acid soils may be due to the associated increase in the incidence of take-all (Gaeumannomyces graminis var. tritici).
1987
Murray G.M. | Scott B.J. | Hochman Z. | Butler B.J.
Lime was applied at rates from 0 to 5.0 t per ha at 4 sites in southern and central New South Wales. A root and crown disease characterised by basal stem blackening affected up to 60 percent of wheat plants and 80 percent of triticale plants when the soil pH was above 5.0 at all 4 sites. Below pH 4.8, incidence was less than 5 percent. The take-all fungus, Gaeumannomyces graminis var. tritici, was consistently associated with this symptom. Losses in grain yield from the disease ranged from 26 to 77 percent depending on site. Regression analysis indicates that each 1 percent increase in plants with basal stem blackening decreased yield by 0.76 percent. These results demonstrate that the disease can reverse the expected increase in yield after liming, and that progressive acidification of the soils in the region may have caused the present reduced amount of take-all.
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