How much acid needs to be added to control alkalinity of my irrigation water?

First have your water tested – irrigation water with over 150 ppm CaCO3 alkalinity often requires injection of an acid to avoid high substrate-pH problems in your crop. Select the acid used (for example, sulfuric, nitric, phosphoric, or citric acid), being aware the acids differ in the nutrients added and safety issues in handling concentrated acid. To select the appropriate acid concentration for your water quality use the AlkCalc online tool from the University of New Hampshire.

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