. Day length and crop yields. Plants; Crop yields; Plant photoperiodism. •%-3 ,'v. Hemp, used for cordage and sometimes for linen, grows rapidly and finally flowers on relatively long photoperiods. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Parker, M. W. (Marion Wesley), 1907-; Borthwick, H. A. (Harry Alfred), 1898-. Washington, D. C. : U. S. Dept. of Agriculture

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Keywords: ., bookcentury1900, bookpublisherwashingtondcusd, booksubjectplants