. Day length and crop yields. Plants; Crop yields; Plant photoperiodism. Strawberries produce abundant fruit when the day length is 14 or 15 hours, but they usually do not flower when the day length is only 1 0 or 11 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

---

Size: 1393px × 1794px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookpublisherwashingtondcusd, booksubjectplants