Critical plant K concentrations for growth and problems in the diagnosis of nutrient deficiencies by plant analysis |
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| Authors: | Barraclough P. B. Leigh R. A. |
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| Affiliation: | (1) Crop Management Department, AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, AL5 2JQ Harpenden, Herts, UK;(2) Biochemistry & Physiology Department, AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, AL5 2JQ Harpenden, Herts, UK |
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| Abstract: | Ryegrass was grown in a glasshouse in pots of soil at a range of available K, either with or without added Na. Critical plant K concentrations for growth were related to different functions of K in plants. Critical K concentrations were 126 mM (1.9% in DM) for biophysical functions in low-Na soils 82 mM (1.3% in DM), for biophysical functions in high-Na soils, and 46 mM (0.8% in DM) for biochemical functions. The implications of the findings for plant testing and the benefits of expressing plant K concentrations on a tissue water basis are discussed. |
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| Keywords: | critical concentration deficiency diagnosis plant analysis potassium ryegrass sodium |
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