Abstract
Summary A study was conducted to observe the nodulation status and measure nitrogenase activity of some important legume tree species in nursery. Of the thirteen species surveyed eight belong to Mimoceae, two Papilionaceae and three Caesalpiniaceae. All the species in Mimo-ceae and Papilionaceae were found nodulated whereas all the members of Caesalpiniaceae were non-nodulated. Among nodulated seedlings, highest number of nodules per seedling was recorded in Leucaena leucocephala (82) followed by Acacia auriculiformis (55), Acacia mangium (52), Albizia lebbeck (46), A. procera (41), Dalbergia sissoo (32) and Acacia catechu (29). Nitrogenase activity was highest in L. leucocephla (4913.59 nmole C2H4 h−1) followed by Albizia procera (2080 nmole C2H4 h−1). Seedling height, nodule fresh weight, root fresh weight and nitrogenase activity (per nodule per h, per gram nodule fresh weight per h, per gram root fresh weight per h and per gram root dry weight per h) were also highest in L. leucocephala.
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