Abstract
PROF. CYRIL HOPKINS, of the Illinois Agricultural Station, is well known in the United States as the initiator of a systematic policy for restoring the fertility of the land of the east and middle west, which is in many respects a supplement to the great work of conserving the national resources-that the late President succeeded in bringing home to the American public.
Soil Fertility and Permanent Agriculture.
By Prof. C. G. Hopkins. Pp. xxiii + 653. (London and Boston: Ginn and Co., n.d.) Price 10s. 6d.
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H., A. Soil Fertility and Permanent Agriculture . Nature 86, 272–273 (1911). https://doi.org/10.1038/086272a0
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DOI: https://doi.org/10.1038/086272a0
