Leaf Gas Exchange and Root Nodulation Respond to Planting Density in Soybean [Glycine max (L) Merrill]

Table 5

Effect of plant density, cultivar and season on sub-stomatal carbon dioxide concentration (µmol CO₂ mol⁻¹).

	Sub-stomatal carbon dioxide concentration (μmol CO2 mol^−1)
Plant density (plants m^−2)	EAI 3600		DPSB 19
	Long rains 2018	Short rains 2018	Long rains 2018	Short rains 2018	Mean
10	93.12	61.78	207.65	81.90	104.86
12	154.75	79.56	58.37	107.54	96.83
20	65.57	103.43	149.57	97.42	102.41
40	107.95	40.70	27.04	70.06	57.61
80	46.92	38.93	109.41	48.16	58.06
Mean (cultivar)	75.86		89.30
-value	<0.001
HSD(0.05)	55.70
CV (%)	20.0

HSD = Tukey’s honestly significant difference; CV = Coefficient of variation.