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A Comparison of the Effect of Complete and Partial Cross-pollination of Alfalfa on Pod Sets, Seeds Per Pod, and Pod and Seed Weight¹

Synopsis: On each of 6 pairs of alfalfa clones, all flowers on 1 member and one third on the other were cross-pollinated. With "one third", 66.4% formed pods with an average weight of 12.7 mg., while with "all flowers", 46.7% formed pods of 11.3 mg. average weight. Clones differed in percentage of cross-pollinated flowers forming pods but behaved similarly at the high and low intensities. Both pod weight and pod set varied for different dates among clones but in no consistent trend. Heavier pods at low cross-pollination intensity are attributed to heavier seeds and pod tissue rather than number of seeds per pod.

² Agronomist, Field Crops Res. Br., A.R.S., U.S.D.A.

³ Agronomist, Albertsland Exp. Sta., Copenhagen, Denmark (temporarily employed by Utah Agr. Exp. Sta.).

⁴ Entomologists, Entomology Res. Br., A.R.S., U.S.D.A.

Received for publication December 22, 1955.

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