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Annals of Botany 23: 269-284, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

Studies in the Growth of Young Plants of Pinus sylvestris L.

II. The Relation of Growth to Soil Moisture Tension

K. SANDS and A. J. RUTTER

Botany Department, Imperial College London, S.W. 7

Plants of Pinus sylvestris in their first and third seasons of growth were grown in containers under moisture regimes in which the maximum tensions were varied between 0.1 and about 9 atm. Compared with plants growing in the o.1 atm. treatment, growth was significantly reduced in the first-year plants by 0.3 atm. and in the third-year plants by a tension between 0.5 and 1.5 atm. Further reductions were caused by the higher tensions employed. The plants appeared to be sensitive to differences in soil moisture tension throughout the growing-season. The effects of soil moisture tension on growth were due mainly to variations in net assimilation rate. It is pointed out that the growth of many plants is substantially reduced by soil moisture tensions of less than 1 atm. and possible interpretations of this are discussed.


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