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Mineral Nutrition and Calcifuge Behaviour in Hypericum
S. J. P. Waters and C. D. Pigott
Journal of Ecology
Vol. 59, No. 1 (Mar., 1971), pp. 179-187
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2258460
Page Count: 9
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Three glasshouse experiments were carried out to investigate the calcifuge behaviour of Hypericum humifusum and H. pulchrum, by comparing their growth with that of the lime-tolerant H. perforatum on two acid and two highly calcareous soils. Additions to the soil of phosphate, chelated iron, nitrate, potassium and manganese were made. All treatments were combined factorially. Addition of phosphate alone produced large increases of dry matter yield in all species on the acid soils and in H. perforatum on the calcareous soils, but produced a rather small increase in growth of H. pulchrum and no increase in growth of H. humifusum on the calcareous soils. Addition of chelated iron alone produced large growth increases in H. pulchrum and in H. humifusum on the calcareous soils, accompanied by relief of lime-induced chlorosis and, in H. humifusum, promotion of flowering. Phosphate and chelated iron added in combination showed a strong positive interaction in promoting growth and flowering in H. humifusum on one of the calcareous soils. A preliminary outdoor experiment indicated clearly that additional factors must be considered in natural environments.
Journal of Ecology © 1971 British Ecological Society