Effects of Meteorological Factors on Dry Matter Production and Partitioning Processes in Wetland Taro (Colocasia esculenta var. esculenta)

• Main Authors: Lu, Chun-Tang, 呂椿棠
• Other Authors: Jiunn-Lung, Lin
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/87116523274901028283

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.