Table 3.

Summary of regression analyses among N nutrition index (NNI_i), shoot dry mass (M_S) and coefficient of N allocation (K_b) for Medicago sativa

Parameter	Value	s.e.	SS	F
c 1	1·311	0·070	0·775	351·4***
c 2	–1·152	0·083	0·426	193·2***
c 3	0·109	0·021	0·057	25·8**
Stepwise selection
Variable entered	No. of variables	Partial r2	Model r2	F
NNIi	1	0·851	0·851	39·8***
M S	2	0·121	0·972	25·8**

Model: K_b = c₁ + c₂ NNI_i + c₃ M_S.

** P < 0·01; *** P < 0·001.