Influences of third crop plucking on autumn canopy structure for mature tea (Camellia sinensis L.) bush
2008
Nakano, T.(Shizuoka Airport Construction Office, Shimada (Japan))
Changes in autumn canopy structure of tea bushes between early-plucked (here after EP, yield was 421 kg/10a on Aug. 1st in 2005), late-plucked (LP, 827 kg/10a on Aug. 8th) and not-plucked (NP) of the third crop was investigated by a stratiform clip method. All canopies of three bushes were cut with every 2 cm layer by a self-rail-tracking tea plucker on Oct. 19th in 2005. The result of vertical distribution of canopy biomass showed that the third crop plucking caused a decrease in leaf weight and bud number at the upper layers of the autumn canopy, but caused an increase in their lower layers. Although leaf weight of EP was same as that of LP, Leaf area index of EP was smaller however leaf specific weight was larger than LP. An analysis of relationship between autumn skiffing positions and bud number of the canopy surface was performed in order to estimate influences of the third crop plucking on new shoot number of the next first crop. The result was follows; the bud number of EP and LP was larger than that of NP at a lower autumn skiffing position (4 cm upper above the second plucking position), while bud number of NP was larger than EP and LP at a higher autumn skiffing position (6 cm upper).
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