Table 4 System elements of CO2 equivalents in hydroponic farming.

From: Sustainable hydroponic production using solar energy and treated greywater within the water-energy-food-environment nexus

Input

CO2 emissions equivalent

Unit

Input

Electricity

0.210

Kg CO2eq kWh−1

Steel

1.76

kg CO2eq m−2

PE

2.2

kg CO2eq m−2

PVC

3

kg CO2eq m−2

Phosphate

0.2

kg CO2eq kg−1 (P2O5)

Potassium

0.15

kg CO2eq kg−1 (K2O)

Nitrogen

1.3

kg CO2eq kg−1 (N)

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