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Published in Crop Sci 19:425-428 (1979)
© 1979 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Gibberellin Studies with Sugarcane. II. Hand-sampled Field Trials1

L. L. Buren2, P. H. Moore3 and Y. Yamasaki4

Seven sugarcane (Saceharum sp. hybrids), cultivars grown on 1,600 ha of the four sugarcane growing islands in Hawaii received 140 g/ha gibberellic acid (GA3) in single or in two haft-rate applications during the wnter of 1976. Stalks harvested 4 to 6 months after the last GA3 application were divided into supposedly responding and non-responding segments. Analyses of lengths and weights for each segment and for the sum of the three segments showed significant increases due to treatment. The effect of GA3 was not limited to the "responding" segment, so that whole stalk data were necessary to calculate the response of yield to treatment. In addition to increasing weights, GA3 treatments improved the sucrose content of juice. These gains resulted in a calculated yield improvement of 0.93 to 1.47 metric tons sugar/ha.

Key Words: Growth regulators • Gibberellic acid • (GA3) • Saccharum sp.

1 Contribution from the USDA, SEA, FR, and the Hawaiian Sugar Planters Association Exp. Stn., Aiea, HI 96701. Published with the approval of the Director as Paper No. 451 in the Journal Series of the Experiment Station, HSPA.

2 Associate agronomist. Present address: Stauffer Chemical Co., Sunnyvale, CA 94087.

3 Plant physiologist, USDA-SEA, Hawaiian Sugar Planters' Association, Aiea, HI 96701.

4 (Retired) Formerly assistant agronomist, Hawaiian Sugar Planters' Association.

Received for publication July 5, 1977.




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