Green-Blue Network in China

NO - 3 NH + 4 PO 4 -3 N 2 O 2 N P P N N P N P N NO - 3 NH + 4 PO 4 -3 NO - 3 PO 4 -3 NH + 4 NO - 3 NH + 4 PO 4 -3 ℃ ℃ ℃ ℃ NO 3 - NH + 4 PO 4 -3 NO 3 - NH + 4 PO 4 -3