Abstract
Five field experiments were conducted during 1982 and 1983 to evaluate the yield response of two lines of common wheat and one line of durum wheat to several rhizospheric bacteria. The two lines tested in the 1982 experiment (a common wheat and a durum wheat) showed a considerable yield response to incoulation withAzospirillum brasilense, with an average significant yield incresae of 23%. In the 1983 experiments, variable yield responses, some of which were significant, were obtained by inoculating three wheat lines (two common wheat and one durum wheat) with Azospirillum or with other rhizospheric bacteria, isolated from various Israeli wild relatives of wheat. A certain specificity between the tested wheat lines, the applied bacteria and the particular local conditions was evident. Inverse relationships were found between the maximum percentage yield increase due to inoculation with the most efficient bacteria and the yield level of the non-inoculated plots.
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