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can be grown in both acid and limed soils achieving yields comparable to specifically
nodulating cultivars. There is need for further studies to determine threshold N limits where
mineral N has to be applied without causing the observed negative effects on N fixation and
ultimately yield of soybean.
A CKNOWLEDGMENTS
We thank the Rockefeller Foundation for funding this research through the Management
of Soil Acidity Project (Grant no. 2001FS140).
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