Table 2.

Analysis of variance for the effect of experiment (E), cultivar (Cv), water treatment (W: well-watered plants and water-stressed plants), boron treatments (foliar boron was applied at 0.45 kg·ha⁻¹ at flowering and seed-fill stages), and their interactions on seed sugars (mg g⁻¹), nitrogen fixation rate (ARA), and natural abundance of nitrogen and carbon isotopes (¹⁵N/¹⁴N ratio; ¹³C/¹²C ratio).

Source effect	Sucrose	Raffinose	Stachyose	Glucose	Fructose	ARA	15N/14N	13C/12C
Experiment (E)	NS	NS	NS	NS	NS	NS	NS	NS
Cultivar (CV)	∗∗	∗∗	∗∗	∗∗∗	∗∗	∗∗	NS	NS
Water treatment (W)	∗	NS	∗∗∗	∗∗	∗∗	∗∗∗	∗∗	∗∗
Treatment (Treat)	∗∗	∗∗	∗∗∗	∗	∗	∗∗	NS	NS
E × CV	NS	NS	NS	NS	NS	NS	NS	NS
E × W	NS	NS	NS	NS	NS	NS	NS	NS
E × Treat	NS	NS	NS	NS	NS	NS	NS	NS
CV × W	∗	NS	∗∗	∗∗	∗	∗∗	∗	∗
CV × Treat	NS	NS	NS	NS	NS	NS	NS	NS
W × Treat	∗	∗	∗∗	∗	∗	∗	NS	NS
E × CV × W × Treat	∗	NS	∗	∗	∗	∗	NS	NS

∗: significance at P ≤ 0.05; ∗∗: significance at P ≤ 0.01; ∗∗∗: significance at P ≤ 0.001.