Geothermal water as a nutrient medium source on the biomass productivity and biochemical composition of Spirulina (Arthrospira platensis) under the greenhouse conditions

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Table 4

Correlation between nutrient salts in culture mediums and biochemical content of Spirulina cultured in the Schlösser's medium and in the different ratios of geothermal water.

	Biomass yield	Protein	Lipid	Ash
HCO₃⁻ (mg/L)	0.52	–0.15	–0.60	–0.96*
pH	0.67	–0.10	–0.68	–0.98*
EC (μS/cm)	0.56	–0.13	–0.64	–0.97*
Hardness (Fr°)	–0.95*	–0.21	0.94*	0.85*
NO₃⁻ (mg/L)	0.66	0.43	–0.66	0.01
SO₄⁻² (mg/L)	–0.92*	–0.45	0.93*	0.80*
Cl⁻ (mg/L)	0.61	–0.08	–0.72	–0.98*
Br⁻ (mg/L)	0.84*	0.37	–0.65	–0.88*
I⁻ (mg/L)	0.03	–0.45	–0.41	–0.56
HPO₄⁻² (mg/L)	0.44	0.99*	–0.27	–0.18
CO₃⁻² (mg/L)	0.13	–0.38	–0.25	–0.78
Total Mineralization	0.52	–0.13	–0.60	–0.97*
H₂ SiO₃	–0.70	0.11	0.63	0.95*
Na⁺ (mg/L)	0.54	–0.11	–0.62	–0.97*
K⁺ (mg/L)	0.86*	0.13	–0.83*	–0.96*
Mg⁺² (mg/L)	–0.95*	–0.20	0.95*	0.85*
Ca⁺² (mg/L)	–0.76	–0.34	0.42	0.69
Mn⁺² (mg/L)	–0.97*	–0.24	0.95*	0.80*
Fe⁺² (mg/L)	–0.01	–0.43	–0.33	–0.62
Cd (mg/L)	–0.95*	–0.23	0.96*	0.81*
Zn (mg/L)	0.23	0.40	–0.20	0.50
Cu (mg/L)	–0.64	0.39	0.72	0.30
Ni (mg/L)	–0.40	0.42	0.13	0.47
Cr (mg/L)	–0.78	–0.58	0.45	0.20

The data was analyzed using correlation analysis. The asterisks indicate strong positive (0.8 and above) or negative (−0.8 and below) correlations between the parameters.

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