The contribution of the leguminous hedgerow trees Flemingia congesta and mixed Gliricidia sepium - Peltophorum dasyrrachis established on an Ultisol (Grossarenic Kandiudult) in Northern Lampung, Sumatra (Indonesia) to the N economy of the hedgerow intercropping system was assessed. N2 fixation estimates of hedgerow trees over a two year period after establishment were obtained by the 15N dilution method using Peltophorum dasyrrachis as the non-fixing reference plant. Average yearly tree pruning dry matter and total N yields of the two hedgerow systems were not significantly different although seasonal differences occurred.
Netherlands Journal of Agricultural Science (2000) 48 (1) 47-59
Quantifiation of biological N2 fixation of hedgerow trees in Northern Lampung