Effect of Ancymidol and Illumination Duration on Cotton Flowering Period

• 1、North China Key Laboratory for Crop Germplasm Resources of Education Ministry, Heibei Agriculture University, Baoding, 071001, China.

Abstract：This study used brown cotton 1-61 as test material, Controlling cotton flowering by spraying the Ancymidol and changing the duration of illumination. Spraying different concentrations of Ancymidol (40 mg/L, 80 mg/L, 120 mg/L) and treatment of different illumination durations (8 h, 12 h, 16 h, 20 h ). Comparative analysis of the initial flowering period, flowering period, number of flowers. The research found that the application of a concentration of 80 mg / L of flower spray at the four-leaf stage began can make flowering period 2 days ahead, the number of flowering increases. Different illumination treatments found in artificial climate chambers is that controling time 16 h light and 8 h dark time, and the daytime temperature is 30 ℃ and the night temperature is 25 ℃. It could make the initial flowering peEffect of Ancymidol and illumination duration on cotton flowering periodriod 12 days ahead and promoted the development of brown cotton buds.

Keywords： Cotton, Flowering bell, Ancymidol, Illumination duration