Dormancy in Curcuma (Curcuma alismatifolia)
Chang, C. S.
Curcuma plants were dormant naturally during October to November in Taiwan. It could extend flowering period and delay dormancy to Jan. 3 and Mar. 8 respectively, and increased the cut flower numbers to 26.0 per m2 with 8.8% abnormal flowers, when curcuma treated with plastic PE tunnel to keep canopy warm plus light illumination from 22:00 p.m. to 02:00 a.m. This treatment also increased the quality on length of the cut flower stalks, diameter of stalk and the number of ink petal. Plants treated with night-break lighting could extend flowering period and delay dormancy, but reduced the quality of cut flowers and all flowers were abnormality. Plants treated with plastic PE tunnel didn’t extend flowering period, but only delayed dormancy to Dec. 12. These experiments hinted that the major factor induced curcuma dormancy was daylight, and low temperature was cofactor. When plants became dormant, corms break dormant gradually in field during winter. Corms sprouted at 30~35℃ more earlier while corms harvested after Feb. 5, that didn’t begin-and end-sprouting until 40 days and 60 days after sprouting at 30~35℃. But corms forcing with low temperature before sprouting on 30℃ didn’t advance the time of sprouting. These showed curcuma corms had broken dormant at February naturally. Corms storied with wet-stored at 10~15℃ would break dormant and sprout more earlier when harvested before Feb. 5, but this treatment would delay the time of sprouting when corms harvested after Feb. 5. This hinted curcuma corms could be stored at this temperature for long time.
Keywords: curcuma, dormancy
Accepted for publication: June 30, 1997