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water quality(12)
surface water(8)
water pollution(6)
lakes(4)
phytoplankton(4)
rivers(4)
fertilizers(3)
nitrates(3)
agricultural soil science(2)
cyanobacteria(2)
fresh water(2)
nitrogen(2)
pollution(2)
seasons(2)
water columns(2)
algae(1)
aquaculture(1)
bacillus cereus(1)
bacteria(1)
biogeochemistry(1)
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