Dry Matter Production, Nutrient Cycled and Removed, and Soil Fertility Changes in Yam-Based Cropping Systems with Herbaceous Legumes in the Guinea-Sudan Zone of Benin

Table 6

ANOVA, partial nested model of the effect of the four treatments on logarithmic transformed values of dry matter yields of  “Kokoro” yam (Dioscorea rotundata) (2002-2003 and 2004-2005, 4 sites, 32 farmers, Benin).

Source	DF	Adj. SS	Adj. MS
Site	3	0.4258	0.1419
Farmer (Site)	28	3.4833	0.1244	0.18	1.000
Replicate (Site)	96	42.3111	3.5259	27	0.000
Year	1	0.0002	0.0002	0.01	0.943
Treatment	3	224.0376	74.6792	5344.06	0.000
Site × Treatment	9	0.0291	0.0032	0.11	0.999
Treatment × Farmer (Site far)	84	2.2389	0.0267	1.62	0.001
Year × Farmer (Site)	28	6.933	0.2476	15.02	0.000
Year × Treatment	3	0.0114	0.0038	0.2	0.892
Year × Site	3	0.141	0.047	0.19	0.904
Year × Site × Treatment	9	0.1685	0.0187	1.14	0.334
Error	756	12.4598	0.0165
Adjusted -square (%)	94.24

DF: degree of freedom; Adj. SS: adjusted sums of squares; Adj. MS: adjusted mean squares; : Fisher’s test; : Fisher’s probability test.
Denominator of -test is zero.