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Alkalinity of irrigation water affects pH of the plant growing media. High alkalinity water raises media pH and affects nutrient availability to plants and, thus, plant growth. Alkalinity levels in irrigation water vary in different regions. Knowledge of alkalinity levels would help growers and advisors in modifying cultural practices to suit the levels. To find out how the levels vary in different states, we searched our database of thousands of water analyses from across the country. Overall, 38% of the waters had &lt;100 ppm CaCO 3 , a level not considered to be a concern for even small pots. About 74% of the waters had &lt;200 ppm CaCO 3 , a level considered to be safe for large pots. The majority of the waters in the states along the eastern seaboard had &lt;150 ppm CaCO 3 . In waters in the interior states, alkalinity levels varied. Pacific Northwest had most waters &lt;150 ppm CaCO 3 . Detailed results—bar charts showing percent of waters at different alkalinity levels in each state and in the country will be shown.

Geographical Profiles of Alkalinity Levels in Greenhouse Irrigation Waters