The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan.

  • Richard Kirwan
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan. Source: Wellcome Collection.

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    / [ 45 ] phofphorated iron, calx of non, and manga* nefe§. Since plants derive fome proportion of earth from the foil on which they grow, we cannot be furprized that thefe loils fhould at length be exhaufted by crops that are carried oh; luch as thole of corn and hay, particularly the former: even lands paftured muft at laft be exhaufted, as the excrements of animals do not reftore the exa6t quantity that the animals have con- fumed; and hence the utility ot mucks, as the re flora tion is performed by more animals than have been employed in the confumption. Hence alfo a fuccelfion of different crops injures land lefs than a fuccelfion of crops of the fame kind, as different proportions of the different earths are taken up by the different vegetables. Finally, we may hence derive the utility of marling land, as the deficient earths are there- by replaced. This fubjeft admits of more pre- cifion than has been hitherto imagined, and may even be fubjecled to calculation. The abfolute quantity and relative proportions of the various earths in an acre of land may be de- termined, fo may that in the crops of different vege-