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Published online 1 January 1968
Published in Agron J 60:81-84 (1968)
© 1968 American Society of Agronomy
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Effect of Seed Pod and Temperature on Speed of Germination and Seedling Elongation of Sainfoin (Onobrychis viciaefolia Scop.)1

A. E. Carleton, C. S. Cooper and L. E. Wiesner2

Optimum temperatures for germination of sainfoin seed and for seedling growth were determined in conjunction with studies of the effect of the presence or absence of the seed pod. Optimum temperature range for germination of sainfoin was from f5 to 20 C. A higher range of optimum temperature, 20 to 30 C, was found for seedling growth. The presence of pods at all temperatures reduced speed of germination and speed of seedling elongation. Pods on the seed slowed water absorption by 4 to 5 hr. A water soluble inhibitor which slowed the speed of germination of shelled seed was detected. This inhibitor was readily removed from the pod by washing. Mechanical restriction of germination by the pod appeared to be a minor factor in the total effect of the pod on speed of germination. There was no difference in field emergence rates of sainfoin seedlings from shelled and unshelled seed.

Key Words: effects of moisture and inhibitors

1 Cooperative investigations of the Montana Agricultural Experiment Station and the Crops Research Division, Agricultural Research Service, USDA. Published with the approval of the Director of the Montana Agr. Exp. Sta. as Journal Series 814.

2 Assistant Professor; Agronomist, Crops Res. Div., ARS, USDA; and Seed Analyst, Montana State Univ., Bozeman, Mont., respectively.

Received for publication June 6, 1967.




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Copyright © 1968 by the American Society of Agronomy.