| Summary: | 碩士 === 國立中興大學 === 農藝學系 === 85 === The objective of this study was to investigate the effects of
meteorological factors on dry matter production and partitioning processes
in wetland taro (Colocasia esculenta var. esculenta). Two year-round
experiments were conducted during November in 1993 to August in 1995 at
at Taiwan Agriculture Research Institute (TARI). There are a total of
twelve transplanting dates. Samples were randomly taken at one-month
intervals starting at transplanting and ending at harvest. The total
leaf area, leaf dry weight, petiole dry weight and corm dry wieght of
each plant were measured. The climate data at TARI were also collected
during experimental periods. The results showed that the development
and growth of different plant parts of taro were changed with climatic
variation under different transplanting dates.This can lead to significant
difference in corm yield at harvest. Climatic variation also resulted in
year-difference of plant growth of taro. Based on the partitioning
coefficient of corm, base temperature of taro was calculted as 15.2 C
from Reaumur''s heat unit model. Cumulative effective temperatures during
the growth periods for each transplanting dates were then estimated. Combined
all the data under twelve transplanting dates, the spline models for regressing
partitioning coefficients on cumulative effective temperature were developed.
From the spline regression analysis, revealed that the corm would be the only
sink of current assimilate when cumulative effective temperature reached
1642.6 C. Eestimated values of partitioning coefficients of current
assimilate for leaf, petiole and corm at different time scales of cumulative
effective temperature were obtained from the spline regression models.
To devide the growth periods of taro under different transplanting dates,
different intervals of 100, 150, 200 C of cumulative effective temperature
were used as ime scales. Whichever time scales, there were no significant
correlation between crop growth rate and ten climatic factors, as well as
betweem corm north rate and ten climatic factors. Thus, futher experimental
efforts might be needed.
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