Biomass of some grass species under different ages and spacings of Melia azedarach linn. plantation
1988
Niwat Ruangpanit (Kasetsart Univ., Bangkok (Thailand). Faculty of Forestry, Dept. of Conservation) | Somnuek Pongumphai
The study on biomass of four grass species, namely Panicum maximum, Brachiaria ruziziensis, Panicum maximum c.v. hamil and Panicum maximum var. trichoglumes, under 4x4 m and 2x8 m spacings of Melia azedarach Linn. plantation at Ongpra Reforestation Unit, Suphan Buri Province, were carried out during January to December 1986. The experimental method used in the study was a completely randomized factorial design. Statistical analysis of biomass showed that there was significant difference (P0.01) existed among grass species, also significant difference (P0.01) between spacings, from Panicum maximum (1007.1 kg.ha-1) followed by Brachiaria ruziziensis (915.4 kg. ha-1) Panicum maximum c.v. hamil (809.7 ka.ha-1) and Panicum maximum var. trichoglumes (408.1 kg.ha-1). Apparently, the biomass varied with the amount of rainfall. The average dry matter of grass species in 2x8 m spacing was higher than that 4x4 spacing of Melia azedarach Linn. plantation. They were 1053.8 kg.ha-1 of biomass under 2x8 m spacing and 516.3 kg.ha-1 under 4x4 m spacing. It was recommended that the appropriate spacing for the agroforestry practice under the forest plantation should be 2x8 m rather than 4x4 m.
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