At first the result was highly satisfactory; all the humus, by exposure to the air, was converted into soluble extract and taken up by the plants, which thrived well as long as the supply lasted : but in the end the soil was exhausted; and the wannest admirers and supporters of Tull's system, Du Hamel and De Chateauvieux, besides many others, found to their cost, in practice, that pulverising alone will not restore fertility.
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