Abstract
A bioassay procedure was developed using a modified Leonard jar system to test effects of soybean (Glycine max ’Clay’) root extracts and the absorbent polyvinylpolpyrollidone on soybean root growth and nodulation from Bradyrhizobium japonicum. Root growth and root browning were affected and were correlated with nodule number.Key words: Glycine max nodulation, polyvinylpolypyrollidone, root extracts
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