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

Table 4

Effect of plant density and cultivar on stomata conductance (mmol H₂O m⁻² s⁻¹) at vegetative and 50% flowering stages.

Stomata conductance (mmol H2O m^−2 s^−1)
	Vegetative stage	50% Flowering stage
Cultivar and density (plants m^−2)
Cultivar EAI 3600 at 10 plants m^−2	60.9	38.44
Cultivar EAI 3600 at 12 plants m^−2	69.6	29.33
Cultivar EAI 3600 at 20 plants m^−2	61.8	33.87
Cultivar EAI 3600 at 40 plants m^−2	50.0	33.08
Cultivar EAI 3600 at 80 plants m^−2	50.7	30.38
Cultivar DPSB 19 at 10 plants m^−2	68.7	24.09
Cultivar DPSB 19 at 12 plants m^−2	46.2	16.28
Cultivar DPSB 19 at 20 plants m^−2	60.4	26.45
Cultivar DPSB 19 at 40 plants m^−2	49.1	15.95
Cultivar DPSB 19 at 80 plants m^−2	53.1	24.12
-value	0.009	< 0.001
HSD(0.05)	11.81	5.99
Density (plants m^−2) × season
10 × Long rains	72.7	45.11
10 × Short rains	57.8	22.67
12 × Long rains	64.2	39.52
12 × Short rains	47.6	27.43
20 × Long rains	54.3	36.36
20 × Short rains	65.1	18.12
40 × Long rains	52.6	23.96
40 × Short rains	54.0	18.77
80 × Long rains	48.6	25.30
80 × Short rains	53.6	14.77
-value	0.005	0.002
LSD(0.05)	11.81	5.99
Cultivar × season
EAI 3600 × Long rains	54.7	31.58
EAI 3600 × Short rains	52.8	22.39
DPSB 19 × Long rains	62.3	36.51
DPSB 19 × Short rains	58.5	18.32
-value	0.719	0.002
LSD(0.05)	7.47	3.79
Density × cultivar × season	ns	ns

HSD = Tukey’s honestly significant difference; ns = not significant.