The place of legumes in pasture production
1935
Fergus, E.N.
Some years ago Campbell presented data which suggest that in eastern United States nature largely uses legumes for building up the nitrogen supply of newly exposed soils, and that as the available nitrogen supply becomes less of a limiting factor in the support of the plant population on a soil, the legumes become relatively much less prominent in the vegetation. It seems reasonable to infer, therefore, that legumes should naturally be present in the pasture flora in eastern United States where the permanent pasture is in reality a preclimax plant community, and further that if they are present their effect, because of their nitrogen-fixing quality, tends to cause the pasture flora to change to an ecologically more advanced plant community.
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