Call Prefix : PR-T

Call Suffix : 1993

Call Cutter : D - Silv 3

Location : SEARCA Library

Format : TD

Publisher : University of the Philippines Los Baños,

Publication Date : April 1993

Publication Place : Los Baños, Laguna, the Philippines :

Summary : Above-ground and below-ground competition were investigated in an alley cropping system with the use of existing hedgerows of Cassia spectabilis, Gliricidia sepium and Pennisetum purpureum and with upland rice as alley crop. The root barrier and the non-barrier treatments did not significantly increase the height, grain yield and total dry matter of upland rice alley crop in the three hedgerow species. The hedgerow height significantly affected the growth and yield of upland rice, and that the height, grain yield, and total dry matter of rice were significantly higher in the pruned than in the unpruned hedgerows. Hedgerow density had no significant effect on the growth and yield of rice. The root growth investigations showed that most of the fine roots of Cassia spectabilis were found within a 30-cm soil depth. The bigger roots were found in the deeper soil layer. In Pennisetum purpureum hedgerows, all the roots were fine and compact at the hedgerow side. Soil spatial properties across the alley showed that the amount of most nutrients was higher in the lower alley than in the upper alley. The pumping of phosphorous by the rice and the hedgerow indicated that the hedgerow absorbed 0.237 kg P/ha from a plot without phosphorous, and 0.233 kg P/ha from a plot applied with 30 kg P/ha. Rice grain contained about seven times more phosphorus than the straw. The animal-drawn chisel plow did not work well in cutting the hedgerow roots.