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The number of root nodules and nitrogen-fixation rate (judged from nitrogenase activity) were studied in nine varieties of five annual vetchling species: Lathyrus sativus, L. tingitanus, L. chloranthus, L. ochrus, and L. odoratus. All vetchling varieties were inferior to pea Pisum sativum in their nitrogen-fixation rate. A variation in nodulation pattern… (More)