GROWTH OF 4 TREE SPECIES MANAGED AS HEDGEROWS IN RESPONSE TO LIMING ON AN ACID SOIL IN WEST SUMATRA, INDONESIA

A hedgerow intercropping study was conducted for 7 years in West Sumat ra, Indonesia on an acid and highly Al-saturated soil to determine gro wth and yield responses of tree hedgerows and upland rice and cowpea i ntercrops. Three tree species, Paraserianthes falcataria, Calliandra c alothyrsus, and Gliricidia sepium and a no-tree control were planted a t three lime rates with low annual fertilizer inputs of 20 kg P and 50 kg K ha(-1). Paraserianthes and Calliandra grew vigorously, while Gli ricidia grew poorly and was replaced after four years with Flemingia m acrophylla. After four years, Paraserianthes yields declined due to tr ee mortality, probably due to intensive pruning. Calliandra and Flemin gia were well adapted to intensive pruning (4 to 6 times per year). Gl iricidia growth was especially limited by low soil Ca availability and high soil acid saturation. Calliandra and Flemingia yields increased with liming only in the last several years of the study while Paraseri anthes did not respond to lime. The species can be tentatively ranked in response to lime as: Gliricidia >> Calliandra > Flemingia > Paraser ianthes.