Effects of Boron Nutrition and Water Stress on Nitrogen Fixation, Seed δ¹⁵N and δ¹³C Dynamics, and Seed Composition in Soybean Cultivars Differing in Maturities

Table 1

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 protein, oil, fatty acids (g kg⁻¹), and boron (mg B kg⁻¹).

Source effect	Protein	Oil	Palmitic	Stearic	Oleic	Linoleic	Linolenic	Boron
Experiment (E)	NS	NS	NS	NS	NS	NS	NS	NS
Cultivar (CV)	***	***	NS	*	**	*	*	**
Water treatment (W)	***	**	NS	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	NS	**	*	**	**
CV × Treat	*	*	NS	*	***	*	**	*
W × Treat	*	*	NS	NS	**	*	***	**
E × CV × W × Treat	*	*	NS	NS	*	*	*	*

*: significance at ≤ 0.05; **: significance at ≤ 0.01; ***: significance at ≤ 0.001.