
%0 Journal Article
%A Gibson, AH 
%T Physical Environment and Symbiotic Nitrogen Fixation. V. Effect of Time of Exposure to Unfavourable Root Temperatures
%J Australian Journal of Biological Sciences
%D 1967/12/01
%V 20
%N 6
%P 1105-1118
%K 
%R https://doi.org/10.1071/BI9671105
%U https://www.publish.csiro.au/paper/BI9671105 
%X Symbiotic nitrogen fixation by Trifolium subterraneum L., inoculated with three strains of Rhizobium trifolii Dang., was examined over the range of root temperatures 8-28°0. The plants were transferred from an optimal temperature for nitrogen fixation (23°0) to other temperatures at three stages, namely (1) immediately after inoculation, 3 days after germination, (2) 14 days after germ· ination, when nitrogen fixation had commenced, and (3) 21 days after germination, when the plants had been fixing nitrogen for at least 7 days. Nitrogen increase and dry weight accumulation were determined for two growth periods-days 14-21 (I) and days 21-28 (II) 
