. 2019 Mar 29;5(3):e01448. doi: 10.1016/j.heliyon.2019.e01448

Table 4.

AMMI analysis of variance for number of roots per plant, storage root yield, dry matter content and SPVD among 26 sweet potato clones evaluated across six environments in eastern Tanzania.

Sources of variation	df	Mean squares
Sources of variation	df	NRPP	Storage root yield	DMC	SPVD
Genotypes (G)	25	13.77***	83.9***	98.1***	2.78***
Environments (E)	5	30.38***	2396.2***	430.3***	5.39***
Block	12	2.34^ns	28.7***	5.6^ns	1.53***
Interactions (G × E)	125	2.71***	38.0***	10.8***	0.78***
IPCA1	29	5.57***	107.5***	19.5***	1.40***
IPCA2	27	2.52***	28.8**	13.0***	1.08***
Residuals	69	1.58	12.4	6.3**	0.41^ns
Error	300	1.17	10.4	4.1	0.40

df = degrees of freedom; *, *** = significant at 0.05 and 0.001, respectively; ns = non-significant at 0.05; NRPP = number of roots per plant; DMC = dry matter content; SPVD = sweet potato virus disease; GE = genotype by environment; IPCA1 and IPCA2 = first and second interaction principal component analysis axes.