. 2020 Jan 9;7:441. doi: 10.3389/fbioe.2019.00441

Table 4.

Specific growth rate, biomass productivity, carbon content, and carbon dioxide fixation rate of two Spirulina strains cultivated in indoor raceway ponds (4 m²) with different phosphate concentrations (mg L⁻¹).

Phosphate (mg L⁻¹)	Strain	μ (d⁻¹)	P (mg L⁻¹ d⁻¹)	C (% W W⁻¹)	RCO₂ (mg L⁻¹ d⁻¹)
200	208	0.096 ± 0.004^a	19.33 ± 0.000^ab	47.56 ± 0.290^a	33.71 ± 0.616^ab
225		0.102 ± 0.002^a	20.33 ± 0.000^a	47.06 ± 0.106^a	35.08 ± 0.734^a
250		0.090 ± 0.006^a	16.83 ± 0.001^b	48.21 ± 0.495^a	29.77 ± 2.389^b
200	220	0.144 ± 0.006^a	22.17 ± 0.001^a	41.01 ± 1.011^a	33.35 ± 2.358^a
225		0.138 ± 0.017^a	20.46 ± 0.002^a	40.16 ± 0.332^a	30.12 ± 3.028^ab
250		0.126 ± 0.005^a	18.28 ± 0.001^a	34.91 ± 0.750^b	23.41 ± 2.212^b

Dissolved inorganic content (DIC) concentration was 0.1 mol L⁻¹ and pH was 9.5 in this experiment.

Values in the same row with different lower-case letters are significantly different (P < 0.05). Values shown are means ± standard deviation.