Yield-density effect of sixteen month-old Azadirachta indica A. Juss. var. siamensis valeton. plantation [in Thailand]
1987
Prasert Tiyanon
Stem volume and biomass of various parts of 4, 8, 12 and 16 month-old Azadirachta indica plantations planted with different grades of density could be estimated appropriately by using the square of diameter at ground level multiplied by total height of tree (D2oH) as the independent variable of the allo metric relation. Average stem volume and mean biomass of each part of tree were inversely correlated to stand density, following the C-D effect and varying to stand age. The 16 month-old of Azadirachta indica planted with density of 625 trees/hectare had the highest yield per tree. Stem volume yield and biomass yield of each fraction of the plantations were directly correlated to the stand density, following the Y-D effect and varying to stand age. The 16 month-old of Azadirachta indica plantation planted with density of 10,000 tree/hectare had the hightest yield per area. The values of the competition-density index indicated the increasing trend with stand density and stand age. The density of 40,000 trees/hectare plantation had the highest C-D index in total aboveground part of tree at 16 month-old. Growth coefficient of Azadirachta indica indicated the increasing with stand age of plantation with 16 month-old showed the highest growth coefficients in stem volume and stem biomass.
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