Studies On The Regulation Of Florescence Of Phalaneopsis Ssp. In Beijing Area

The study based on the pot-flower Phalaenopsis production in Beijing. The plant growth retardants, the fertilizers of forcing and the temperature control before forcing and GA₃ were used in the flowering regulation of Phalaenopsis. Results are as follows:1) Effect of plant growth retardants: Three different concentrations of plant growth retardants(PP333,B9,CCC) made the first flower anthesis of Phalaenopsis'45#'earlier than the contrast, and the difference was very significant. But for the cultivars'9005'and'F3', the effect was inverse, and the difference was significant. The effects on the height of flower stalk, number of flowers and the diameter of single flower were all inhibited by the three plant growth retardants. The inhibiting effects were stronger with the increase of concentration.2) The experiment of different fertilizer N-P-K ratio for forcing indicated : The prescription 2(N:P₂O₅:K₂O=9:45:15 )was better for forcing than ratio 1(N:P₂O₅:K₂O =10:30:20) and ratio 3(N:P2O5:K2O =0:30:20). Ratio 2 and 1 all made the first flower anthesis earlier, the height of flower stalk higher, the flowers number more and the flowers diameter greater. Ratio 3 was the worst for the flower induction. It made initial the first flower anthesis indistinctively earlier, but inhibited the height of flower stalk, the number and the diameter of flowers by some extent.3) Result of experiment with GA₃+6-BA: The length and diameter of flower stalk, the number and the diameter of flowers were better than the contrast and other treatments by once daubing the second node (from bottom to top ) of Palaenopsis'45#','9005','B-2'with GA₃+6-BA. Only once daubing the second node of'9005'with GA₃ (20,40,60,80,100mg/L ): The result showed that 80mg/L was the best concentration. The number of flowers, the height and diameter of flower stalk were significant great better than the contrast and other treatments, and the diameter of flowers was indistinctive than other concentrations.4) The experiment of temperature control before forcing indicated: To the cultivar Palaenopsis'53#', the time of low temperature(20～23/16～18℃) lasted longer, the flower bud appeared later in the forcing period. The result under high temperature (26～29/20～21℃)was inverse. The first flower anthesis was 30 days treatment under the low temperature, then was 45-days and 60-days . Under high temperature the first flower anthesis was 45-days, the second was 60-days and the latest was 30-days. But under the condition of low temperature, the quality of inthe first flower anthesis (the number of flowers, the height and diameter of flower stalk, and the number and diameter of flower ) related to the time of the two treatments. The longer time of the treatment, the better quality of the inflorescence...