Effects of soil nitrogen status and rate of inoculation on the establishment and populations of Bradyrhizobium japonicum and on the nodulation of soybeans
1989
Brockwell, J. | Gault, R.R. | Peoples, M.B. | Turner, G.L. | Bergersen, F.J. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry) | Morthorpe, L.J. (New South Wales Agriculture and Fisheries, Trangie (Australia). Agricultural Research Centre)
Irrigated soybeans on a grey clay soil were established on land previously cropped or previously fallowed. Mineral N was initially higher on fallowed soil, but was depleted more rapidly so that cropped soil had significantly higher levels after harvest. High levels of N reduced colonization of rhizospheres by bacteria, and plant nodulation; the effect was reduced, but not eliminated, by increased inoculation rates. Nodulation was also reduced at lower rates of inoculation.
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