ABOVEGROUND BIOMASS OF TWO FAST GROWTNG SPECIES IN AGROFORESTRY PLOTS

Abstract

The aboveground biomass of 5-year-old fast growing species planted under agroforestry system at the Integrated Development of the Phu Wiang Watershed Project were collected during 1988 to 1992. The 4 x 20 square meter plots were established at the 9 percent slope. Eucalyptus camaldulensis and Leucaena leucocephala were used as the main crops planted under 2 spacings, 4 x 4 and 2 x 8 meters. Cassava and peanut were selected as agricultural crops planted between rows. There were altogether 8 treatments and 3 replications. The average aboveground biomass of Cassava-Euc-4 x 4, Peanut-Euc-4 x 4, Cassava-Euc 2 x 8, Peanut-Euc-2 x 8, Cassava-Leu-4 x 4, Peanut-Leu-4 x 4. Cassava-Leu-2 x 8 and Peanut-Leu 2 x 8 were 64.54, 54.09, 61.79, 73.41, 17.86, 14.17, 23.04 and 19.30 kilogram / tree, respectively. The results showed that agroforestry of the same tree species and the same spacing, the average biomass of cassava intercropping was higher than peanut intercroppings. Under the same main crop and agricultural crop, planted by using 2 x 8 meters spacing had higher aboveground biomass than using 4 x 4 meter spacing. The aboveground biomass of Eucalyptus camaldulensis was also higher than Leucaena leucocephala.