Influence of Cultivar on the Postharvest Hardening of Trifoliate Yam (Dioscorea dumetorum) Tubers

Table 4

Rate constants of the hard-to-cook defect development during storage of D. dumetorum tubers according to some environmental and tuber’s characteristics.

Variables	Flesh colour		Number of roots on the tuber		Combined factors				Altitude
	Yellow	White	Few	Many	Yellow-few	Yellow-many	White-few	White-many	Low	High
(day^−1)	0.11 ± 0.05	0.16 ± 0.05	0.09 ± 0.04	0.19 ± 0.07	0.07 ± 0.04	0.19 ± 0.07	0.15 ± 0.05	0.17 ± 0.07	0.17 ± 0.06	0.11 ± 0.05
	23.99 ± 3.56	25.02 ± 2.13	24.01 ± 4.46	26.25 ± 2.17	24.99 ± 8.09	26.39 ± 2.23	25.08 ± 2.08	24.77 ± 2.58	24.61 ± 1.99	23.83 ± 3.52
	0.91	0.94	0.92	0.93	0.91	0.92	0.95	0.91	0.94	0.91
	750	180	600	330	450	300	150	30	210	720
	0.0127	0.0057	0.0099	0.0084	0.0129	0.0091	0.0050	0.0128	0.0060	0.0123

: constant rate; : semiempirical parameter; : number of samples; mean ± standard error.