Study on five Australian Acacia spp. and Eucalyptus camaldulensis Dehnh. in different spacing for control Imperata cylindrica (L.) Beauv.
2000
Rattana Thai-ngam | Suchart Nimpila | Panida Roongrattanakul(Royal Forest Dept., Bangkok (Thailand). Forest Research Office. Silviculture Research Div.)
Early results of five Australian Acacia spp. and Eucalyptus camaldulensis that planted to cover Imperata cylindrica at Research and Training in Re-aforestation station Nakorn Ratchasima province with different spacing (2*1, 2*2, 2*3, 2*8 m) at two years old showed highly significant different (P GT 0.001) in growth (height and DBH). Acacia crassicarpa was the fastest growth and Acacia oraria was the poorest growth. There were non-significant different (P GT 0.05) in growth for different spacing. The above ground biomass of Imperata cylindrica under shade of five Acacia spp. and E. camaldulensis was collected at 4 year of the tree. The analysis of variance of dry weight of Imperata cylindrica showed significant different between trees species at P0.05 and highly significant at P GT 0.001 between spacing of the trees. All trees showed good performance to cover Imperata cylindrica with spacing 2*2, 2*3 and 2*4 m. The 2*6 m spacing of A. oraria, A. mangium and A. auriculiformis had good performance while E. camaldulensis showed worst to cover the Imperata cylindrica. For largest spacing (2*2 m), only A. mangium and A. oraria showed ability to cover Imperata cylindrica. There was not interaction of dry weight of Imperata cylindrica between tree species and spacing but there have trend to show interaction when wider spacing.
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