Study On Soilless Culture And Regulation Of Florescence Of Phalaenopsis

Palaenopsis amabilis,perennial epiphytic orchid,belongs to orchid family, originated in tropical and semitropical area.It is one of the most popular tropical orchids in the world.In recent years,the Phalaenopsis industry develops rapidly in China,but some problems are revealed in production,such as immature cultivation technololgies,different quality products,and large gap exists in our products compared with imported products.The test was done in accordance with the existing problems in Phalaenopsis production.Through the methods of potting in greenhouse,simulating indoor and plant analysis,the proper substrate was confirmed,and the suitable nutrient solutions was found in substrate culture.The suitable contents of N,P and K were selected out in hydroponics,and the regulation of flowering time and flower quality improvement were studied preliminarily.The result indicated:①The substrate composition with peat:perlitel=1:1 was suitable for growth of Phalaenopsis.②According to the indexes of different nutrient solutions on the growth of Phalaenopsis,treatmet A2(1/2s of formula A)was more suitable for the growth of Phalaenopsis in substrate culture.③In the hydroponics experiment of Phalaenopsis,the treatment combination 7(N+P+K=150mg/L+30mg/L+160mg/L)was the most suitable solution for the growth in vegetative growth,and the treatment combination 3(N+P+K= 50mg/L+130mg/L+160mg/L)accelerated flowering of the inflorescence and improved the flower quality in reproductive growth stage.④The photoperiod regulation of flowering time indicated that 5h photoperiod treatment delayed the florescence and decreased the flower quality.⑤All the Gibberellin treatments accelerated flowering of the inflorescence,but poor growth would be aroused if the content of Gibberellin was too high.The best Gibberellin content that accelerated flowering of the inflorescence and improved the flower quality was 50mg/L.