01684naa a2200181 a 450000100080000000500110000800800410001902200140006010000170007424500660009126000090015752012420016665000100140865000130141865300150143165300140144677300420146012840621993-05-26       1978    bl uuuu     u00u1 u    #d  a0100-45571 aFERREIRA, M.  aRendimento em peso seco de madeira de plantacoes de pinheiros  c1978  aThe wood specific gravity of 5 year old Pinus caribaea var. caribaea, 6 year old Pinus caribaea var. bahamensis, 6, 12 and 14 year old Pinus caribaea var.hondurensis, 6 and 12 year old Pinus elliottii var. densa, 7, 12 and 14 year old Pinus kesiya, 6, 12 and 13 year old Pinus oocarpa and 6, 12 and 14 year old Pinus patula plantations was studied through increment core specific gravity taken at DBH. The plantations were located in Agudos (Sao Paulo State), latitude 22o20'S-22o22'S, longitude 48o49'W-48o51'W, altitude 600m. For all species, an increase of wood specific gravity in relation to age was observed. The differences of plantation wood specific gravity were significant in relation to species and ages. The annual increment in wood dry weight/area is directly and positively corelated with the annual wood volume increment/area. This relationship is expressed by the linear equation y=1,771+0,3153x, where y=annual increment in wood dry weight/ha, x=annual wood volume increment/ha. It would be diserable to include wood specific gravity plantations studies in the species and provenances trials. The parameter wood dry weight yield/area is interesting for plantation wood quality and mineral nutrients requirement studies.  aPinus  aPinheiro  aDry weight  aPeso seco  tIPEF, Piracicabagn.17, p.78-89, 1978