Abstract
Virtually no information exists on the fate of nodule numbers once drought is imposed on a legume crop. This study was undertaken on field-grown soybean ( Glycine max (L.) Merr.) to observe possible short-term changes in nodule number and dry weight in response to four irrigation treatments. Two years of study showed that mild drought treatments had no significant effect on nodule number or dry weight. Only when severe drought was imposed were significant ( P < 0.05) differences observed in nodule number and dry weight relative to the well-watered and mildly drought-stressed treatments. It was concluded that loss of nodules by soybean did not occur readily upon the imposition of drought and severe drought was required before nodule numbers or dry weight decreased.
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