Day length and crop yields /
[by M.W. Parker and H.A. Borthwick].

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Main Author: Parker, M. W. (Marion Wesley), 1907-
Related Names: Borthwick, H. A. (Harry Alfred), 1898-
Language(s): English
Published: Washington, D.C. : U.S. Dept. of Agriculture, 1942.
Subjects: Plant photoperiodism.
Crop yields.
Plants > Plants / Effect of light on.
Note: "Issued September 1942."
Cover title.
Physical Description: 22 p. : ill. ; 23 cm.
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