Interrelationship among tree growth parameters and dry weights of each organ in different aged Japanese persimmon (Diospyros kaki L. cv. Fuyu) trees
1999
Fumuro, M. (Shiga-ken. Agricultural Experiment Station, Azuchi (Japan))
The relationship between tree age and each tree growth parameter and that among the dry weights (DW) of each organ were examined in 5-, 10- and 24-year-old Fuyu tree (Diospyros kaki L.), a total of 23 trees. The trunk cross-sectional area (TCSA), total shoot length (TSL), shoot number per tree (SN), and DW of each organ increased with the age of the tree. The percentage dry weight of leaves, current shoots, and fine roots were lower, and those of old branches and thick roots were higher in the 24-year-old trees than they were in the younger ones. The dry weight ratio of fine roots to rootstocks was lower in older trees but the top-root ratio did not vary with age. A significant correlation was observed between each tree growth parameter and DW of scion and rootstock. TCSA, TSL, leaf number, and area were correlated with DW of each organ, but the correlation coefficient between the area occupied by the tree canopy and DW of each organ was somewhat low. The regression equation between scion DW (Y kg) and TCSA (X cm2) was: Y = -3.577 + 0.230X (gamma = 0.936) The regression equation between rootstock DW (Y kg) and TCSA (X cm2) was: Y = -1.708 + 0.128X (gamma = 0.93 2) Furthermore, a highly significant correlation was observed between scion DW (X kg) and rootstock DW (Y kg), and the regression equation between them was: Y = 1.029 + 0.529X (gamma = 0.943) In conclusion, scion DW and rootstock DW can be estimated from TCSA easily with a high precision
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