The Garden Guide

Book: Gardening Science - Soils, Manure and the Environment
Chapter: Chapter 2: Manure

Lime, magnesia, and alumina,

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1303. The principal earths which combine with acids to form the salts necessary for vegetables are lime, magnesia, and alumina, the two former being called alkaline earths; and the principal alkalies are potash, soda, and ammonia.