Responses to inoculation with root-nodule bacteria by Stylosanthes humilis and S. hamata in soils of N.E. [North East] Thailand [Bradyrhizobium]
1989
Homchan, J. (Khon Kaen Univ., Khon Kaen (Thailand). Dept. of Soil Science) | Roughley, R.J. (New South Wales Agriculture and Fisheries, Gosford (Australia). Horticultural Research and Advisory Station) | Date, R.A. (Commonwealth Scientific and Industrial Research Organization, St Lucia (Australia). Div. of Tropical Crops and Pastures)
Responses to inoculation with Bradyrhizobium strains were investigated on Korat, Namphong and Yasothon soils, the main soil series of N.E. Thailand. Inoculation with peat-based inoculants containing over 1000 million bradyrhizobia per g carrier significantly increased plant growth but the response was variable between soils and sites within soils. Based on experiments at 2 sites, failure to respond to inoculation could be attributed to the failure of the inoculant to form a significant proportion of nodules in competition with resident strains even when more than one million bradyrhizobia per seed were applied. Application of the inoculant using gum arabic or polyvinyl pyrrolidone as adhesives under a coating of CaCO3 failed to increase the number of bradyrhizobia in the rhizosphere of 14-day seedlings or the proportion of nodules due to the inoculant strain. The resident bradyrhizobia were only partially effective, failing to produce as much dry matter as obtained by applying 100 kg N per ha as urea. Therefore, there is a need to select a more competitive and effective strain for use with Stylosanthes.
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