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Experimental Investigations into the Mineral Nutrition of Several Grass Species: Part I. Calcium Level

A. D. Bradshaw, R. W. Lodge, D. Jowett and M. J. Chadwick
Journal of Ecology
Vol. 46, No. 3 (Nov., 1958), pp. 749-757
DOI: 10.2307/2257548
Stable URL: http://www.jstor.org/stable/2257548
Page Count: 9
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Experimental Investigations into the Mineral Nutrition of Several Grass Species: Part I. Calcium Level
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Abstract

1. The reaction of seven grass species to variation in calcium concentration was studied in sand culture. 2. The species, Lolium perenne, Agrostis stolonifera, Cynosurus cristatus, Agrostis canina, Nardus stricta and a normal and a lead-resistant ecotype of Agrostis tenuis, were harvested after the treatments at three separate times. The fresh weight and dry weight of the shoots and roots were obtained, and from these the dry-weight yield, shoot: root ratio and percentage dry weight were calculated. 3. The species showed different yield reactions to variation in calcium. Three types of reaction could be distinguished; Lolium perenne, Agrostis stolonifera and Cynosurus cristatus whose growth increased markedly with an increase in calcium, especially at lower levels; Agrostis tenuis (both ecotypes) and A. canina whose growth increased only slightly at all levels; Nardus stricta whose growth increased with the initial rise in calcium, but was depressed at higher levels. The overall yields of the species were distinctly different. 4. The species showed differences in shoot: root ratio. 5. The bearing of the percentage dry weight values on the experimental technique are discussed. 6. The calcicole-calcifuge concept and the equation of experimental data with field observations are discussed and it is concluded that results from sand culture can throw considerable light on the ecology of species.

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