Effect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by soybean cultivars

Hardarson, G.; Zapata, F.; Danso, S.K.A.

Plant and Soil 82(3): 397-405

1984


ISSN/ISBN: 0032-079X
DOI: 10.1007/bf02184277
Accession: 001347614

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Abstract
Isotopic and non-isotopic methods were used to assess symbiotic nitrogen fixation in eight soybean (Glycine max) cultivars grown at 20 and 100 kg N/ha under field conditions during two years. The 15N methodology revealed large differences between soybean cultivars in their abilities to support nitrogen fixation. In almost all cases, the application of 100 kg N/ha resulted in less N2 fixation than at 20 kg N/ha. However, N2 fixed in one cultivar, Dunadja, was not significantly affected by the higher rate of N fertilizer application. These results were confirmed by measurements of acetylene reduction, nodule dry weight and N2 fixed as measured by the difference method. Dunadja produced a greater yield at 100 kg N/ha than at 20 kg N/ha. This type of cultivar could be particularly useful in situations where soil N levels are high or where there is need to apply large amounts of N fertilizer.

Effect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by soybean cultivars