The Garden Guide

Book: Gardening Science - Soils, Manure and the Environment
Chapter: Chapter 1: Earths and Soils

The most fertile soils - analysis and testing

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1190. The most fertile soils are those which contain the greatest mixture of earths; but when soils are to be adapted to particular plants, particular kinds of earth are found to be requisite according to the nature of the plants; and what these earths are can only be ascertained by burning different plants and examining their ashes.