Ian K. Bradbury, D. C. Malcolm, The Effect of Phosphorus and Potassium on Transpiration, Leaf Diffusive Resistance and Water-Use Efficiency in Sitka Spruce (Picea sitchensis) Seedlings, Journal of Applied Ecology, Vol. 14, No. 2 (Aug., 1977), pp. 631-641
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Bradbury et al. (1977) studied this question.
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