The Transactions of the American Agricultural Association
The Transactions of the American Agricultural Association
American Agricultural Association
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It is not asserted that other families are absent, but these are so fully developed as to be characteristic of the vegetation. This natural succession differs with the latitude, soil, and degree of moisture ; but whatever may be the families, it is sufficiently apparent that the i:)lants of new soils, or rich weeds as they are called, give place sooner or later to those of the barrens. Nor is this the only evidence of a natural rotation. After a season when the roots of grasses have produced a ...mat of vegetable fibres, is it not well known that the meadow becomes infested with wild onions, buttercups, (Rantmcuhis, ) thistles, and other weeds, which, if not exterminated, soon overwhelm the grasses ? Hence the prudent husbandman adds ashes or lime, and scarifies his meadows ; for by these means the roots are rapidly decomposed, and the soil brought back to a state of composition favorable to the development of grasses : or if he be conducting a rotation, he ploughs the meadow, and thus acquires by art a natural coat of manure, of great service to such cultivated crops as, like the Chenopodiaceae, require a soil rich in organic matters.
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