Ammonium and nitrate in the rhizosphere of spring barley, hordeum vulgare L., and take-all disease |
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| Authors: | JF Darbyshire MS Davidson NM Scott GP Sparling PJ Shipton |
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| Institution: | Departments of Microbiology and Soil Fertility, The Macaulay Institute for Soil Research, Aberdeen AB9 2QJ, U.K.;Plant Pathology Section, North of Scotland College of Agriculture, Aberdeen AB9 1UD, U.K. |
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| Abstract: | The incidence and severity of take-all disease, due to Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker, was observed on spring barley plants growing in soil in two glasshouse experiments. Soil amendments of NH+4-N significantly increased the number of diseased plants and roots during the first month after germination in comparison with controls unamended with N (P < 0.05). No significant difference in the incidence of take-all disease was detected between more mature barley plants growing in soil amended with either NH+4 or NO?3-N and unamended controls. The least take-all disease in 3 month-old barley plants was observed when N was supplied as foliar sprays of urea at 0.5 mg N kg?1 soil (P < 0.01). There was no significant correlation between the degree of infection and the NH+4-N to NO?3-N ratio in the rhizosphere soil |
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