Journal Article Cytokinins and the Growth Responses of Seedlings of Betula pendula Roth. and Acer pseudoplatanus L. to Nitrogen and Phosphorus Deficiency Get access J. M. HORGAN, J. M. HORGAN Department of Botany and Microbiology, University College of WalesPenglals, Aberystwyth, Dyfed SY23 3DA, U.K. Search for other works by this author on: Oxford Academic PubMed Google Scholar P. F. WAREING P. F. WAREING Department of Botany and Microbiology, University College of WalesPenglals, Aberystwyth, Dyfed SY23 3DA, U.K. Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Experimental Botany, Volume 31, Issue 2, April 1980, Pages 525–532, https://doi.org/10.1093/jxb/31.2.525 Published: 01 April 1980 Article history Received: 20 August 1979 Published: 01 April 1980