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Site and Planting Date Effects on Taro Growth

Comparison with Aroid Model Predictions

^a Univ. of Hawaii, Hawaii Branch Stn., 461 W. Lanikaula St., Hilo, HI 96720
^b Dep. of Trop. Plant and Soil Sci., Univ. of Hawaii, 1955 East-West Rd., Room 206, Honolulu, HI 96822

View larger version (39K): [in a new window]   Fig. 1. Taro plant components.

View larger version (25K): [in a new window]   Fig. 2. Daily maximum (unfilled symbols) and minimum (filled symbols) air temperatures and daily total solar radiation averaged monthly during 1992 to 1993 at two sites differing in elevation on the island of Hawaii. Total monthly rainfall in 1992 to 1993 at two sites on the island of Hawaii; however, after July 1992, the rainfall gauge misfunctioned at the High site.

View larger version (16K): [in a new window]   Fig. 3. Potential and actual fresh weight corm yields in Mg ha-1 as affected by months after planting (MAP). For potential corm yields (PCY): PCY = -2.0 + 3.1 x MAP, r2 = 0.79. For actual corm yields (ACY) in Spring + Summer plantings: ACY = 0.3 + 2.1 x MAP, r2 = 0.69. For actual corm yields (ACY) in Fall + Winter plantings: ACY = 0.32 + 1.6 x MAP, r2 = 0.52. Error bars are standard errors of mean.

View larger version (21K): [in a new window]   Fig. 4. Dry weights of various plant components from the main plant and suckers of taro averaged across site and planting date. Error bars are standard errors of mean.

View larger version (17K): [in a new window]   Fig. 5. Leaf area index (LAI) of both main plant and suckers, and stump diameter of main plant in cm as affected by months after planting (MAP). For Spring + Summer plantings: LAI = 0.039 + 0.612 x MAP - 0.030 x MAP2, r2 = 0.38; stump diameter (STDIA) = 3.13 + 0.89 x MAP - 0.053 x MAP2, r2 = 0.50. For Fall + Winter plantings: LAI = -1.01 + 1.10 x MAP - 0.070 x MAP2, r2 = 0.57; STDIA = 1.06 + 1.49 x MAP - 0.089 x MAP2, r2 = 0.65. Error bars are standard errors of mean.

View larger version (19K): [in a new window]   Fig. 6. Comparison of observed potential and simulated dry weight corm yields of taro cultivar Bun-long grown at two sites and four planting dates on Hawaii island based on (A) simulated time to harvest maturity using 28th leaf stage and (B) actual days to harvest at 11 months after planting. Error bars indicate one standard deviation of four replicates.

View larger version (24K): [in a new window]   Fig. 7. Comparison of observed and simulated days to maturity for taro cultivar Bun-long grown at two sites and four planting dates on Hawaii island. There are no error bars because biomass harvests were conducted within 1 d.

View larger version (20K): [in a new window]   Fig. 8. Comparison of observed leaf area index (LAI) and simulated LAI at the 11th leaf stage for taro cultivar Bun-long grown at two elevations and four planting dates.