Alkaline soil

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1. A soil having a basic reaction or a pH above the neutral point, which is pH 7.0; a soil having an excess of hydroxyl (OH) ions, usually found in areas of relatively low rainfall.

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The pH of soil ranges from 0 to 14 with 7 being neutral. A pH above 7 indicates more alkaline soils.
Source: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/alkaline-soil-plants.htm