Table 5.

Factors affecting%Ndfa, quantities of N₂ fixed and soybean grain yield.

Dependent variable	Type of relationa	n	Fpr	Random Factorsb
Explanatory variables
%Ndfac
Technology treatment	C	122	0.023	−
Clay	−	120	0.043	T
Sand	+	120	0.039	T
Sowing date	+	122	0.042	T
Plant population	+	150	0.029	−
Biomass yield	+	148	0.049	−
Gender	C	150	<0.001	T
Value of assets	−	150	0.050	T
Total N2 fixed
Region	C	120	<0.001	−
Year	C	120	0.003	−
Technology treatment	C	120	0.043	R, Y
Available P	+	141	<0.001	R, Y, T
Exchangeable K	+	111	0.015	R, Y, T
Grain yield	+	150	<0.001	R, Y
Biomass yield	+	148	<0.001	R, Y
Plant height	+	148	0.002	R, Y
Soybean grain yield
Region	C	150	0.005	−
Year	C	150	<0.001	−
Technology treatment	C	150	<0.001	R, Y
Plant height	+	148	<0.001	R, Y
Biomass yield	+	148	<0.001	R, Y
Plant population density	+	150	0.013	R, Y
Weed score	−	133	0.022	R, Y
Total N2 fixed	+	120	<0.001	R, Y
Net N benefit from BNF	−	120	<0.001	R, Y
Gender	C	150	0.002	R, Y, T
Value of assets	+	150	<0.001	R, Y, T

^aFor continuous variables ‘+’ indicates a positive and ‘−’ a negative correlation with the dependent variable; Categorical factors are indicated with “C”.

^bRandom factors included in the REML model: R = Region, Y = Year, T = Technology treatment.

^cPercentage of nitrogen derived from the atmosphere.