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ISHS Acta Horticulturae 198: Symposium on the Timing of Field Production of Vegetables

EFFECT OF GROWTH REGULATORS ON FLOWERING, NUMBER OF UMBELS, SEED YIELD AND SEED QUALITY OF CARROT (DAUCUS CARROTA).

Authors:   M. Elbella, D.J. Cantliffe
DOI:   10.17660/ActaHortic.1987.198.20
Abstract:
A greenhouse study was initiated to investigate the effect of growth regulators on flowering, number of umbels, seed yield and seed quality of carrot. Bud application of 1000 ppm Gibberellic acid (GA3), 2000 or 5000 ppm Daminozide, 250 or 500 ppm phosphon-D, drench application of Ancymidol at 100 or 250 ppm or chlormequat at 2000 or 5000 ppm, were applied to carrot stecklings 2 weeks after planting then twice weekly for either 2 weeks for Ancymidol and chlormequat or 4 weeks for the other chemicals. All chemicals had no significant effect on the number of days to flowering. Gibberellic acid increased seedstalk height, while Ancymidol and phosphon-D at 500 ppm reduced it. Ancymidol and Daminozide reduced the number of umbels per plant at both concentrations of chemical used, however, Ancymidol reduced seed yield. The percentage of seed from the primary and secondary umbels was increased by Daminozide. There was no effect on germination percentage and germination rate was increased by many of the chemicals used.
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