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Nutrient availability to plant roots varies according to soil pH. Wider bars indicate greater availability at that pH. For optimal nutrient availability, a good range of soil pH for most plants is 6.0 to 7.5.
Credit: Bailey DA. 1996. Alkalinity, pH, and Acidification. In Reed DW, ed. A Grower's Guide to Water, Media, and Nutrition for Greenhouse Crops. Ball. Batavia, IL, Landis TD, Tinus RW, McDonald SE, Barnett JP. 1990. Containers and Growing Media. Vol. 2: The Container Nursery Manual. United States Depart. Agric. Handb. 674; Truog E. 1948. Lime in Relation to Availability of Plant Nutrients. Soil Science 65:1_7.