Protection of Ponds against ...

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Protection of Ponds against Excessive Algae Growth

Usually algae can be controlled with spreading copper sulfate in the pond - however, it is not known what crops you have and how would copper sulfate impact them.

Alternative treatment is to cover the reservoir with small plastic balls that float on the surface and prevent sunlight from reaching the pond.  There are companies specialized in making such balls (usually of diameter of 5 to 6 cm each) but you could use any other balls that are not transparent.