. Day length and crop yields. Plants; Crop yields; Plant photoperiodism. s>.T*JK». &V oaMuR '3% > 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: 2147px × 1164px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookpublisherwashingtondcusd, booksubjectplants