Effects of available soil nitrogen and rates of inoculation on nitrogen fixation by irrigated soybeans and evaluation of [natural abundance of] 15N methods for measurement
1989
Bergersen, F.J. | Brockwell, J. | Gault, R.R. | Peoples, M.B. | Turner, G.L. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry) | Morthorpe, K.J. (New South Wales Agriculture and Fisheries, Trangie (Australia). Agricultural Research Centre)
Cropping with oats in the previous winter reduced the soil N available to irrigated soybeans by half, and altered the occurrence of 15N. Effects on the soybean crop were to increase N fixation in early growth, while reducing growth rate, and during seed development, which, together with high inoculation rates, resulted in high seed yields and seed N concentration. Estimates of the proportion of plant N derived from fixation by the 15N method agreed well with estimates based on the relative concentration of ureides in xylem sap.
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