| Cyclamen (Cyclamen persicum L.) belongs to Cyclamen genus, Primula malacoides Franch family. Because of its special ornamental and horticultural characteristics, such as unique flower-shape, rariegated colors, long-lasting flower-periods, suitable for porting, and the professional potting system for some different kinds of Cyclamen varieties in modern greenhouse have been setting up for a long periods in Europe, U. S. A and Japan. The cultivation history of Cyclamen in China is so short that the quality of cultivars with high production and excellent quality is very small. And the researches of production techniques in modern facility greenhouse were only studied preliminarily. All the shortcomings, such as the low rate of superior product, high-production costs, the defects of production techniques, would become more and more outstanding in the process of large scale production.The absorption and accumulation rules of N, P were researched in three cultivars of Cyclamen (2010,2071,1145), the results showed that:Their amounts of dry matter accumulation and different parts of plantlet were tested in different growth and development stages. The results showed that the dry matter accumulation of Cyclamen1145was the least. Even the growth has to stagnate for dormancy, the nutrient elements of absorption and accumulation of Cyclamen’s underground-parts still kept on. In September, Cyclamen’s aerial parts began to vigorous growth. At the same periods, the accumulation of dry matters in Cyclamen’s aerial parts would reach the peak. The dry matter of2010, in this period would account for73.61%of dry matter accumulation in the whole growth and development stages. In addition,59.73%of2071and38.95%of1145. The cultivar1145would begin the vigorous growth more earlier than the other two cultivars. After December, the accumulation and consumption in plant would reach the balanced states. The order from high to low of distribution proportion of dry matters in different organs was respectively leaves-parts, root-parts, corm-part. In different growth and development stages, the distribution ratio of dry matters in different parts would have some changes. Basically, the leave-parts would account for60-75%, corm part with15-20%, and root with15-20%.The absorption and accumulation rules of nitrogen, phosphorus were researched under protected cultivation using2010,2071and1145. There existed great differences among the three cultivars.The common feature of three varieties of Cyclamen is, the amount of N, P in stem will go down till the lowest when they step into the rapid-growing periods. The ratio of the amount of N, P in leave and roots have a close relationship with growth rate. In high-temperature season, the distribution of total amount of nitrogen in the plants of Cyclamen were:leaf>stem> root, while in the rapid-growing periods of autumn, it turns into:leaf>root>stem. For the poor heat tolerance species, they will stop growing under heat adversity condition. Then the amount of nitrogen in leaf and stem is the highest, and lowest in root, ratio of nitrogen in leaf to toot and stem to root are both high.The ratio of nitrogen in leaf to root can exemplify nutrition better than the problem of only leaf, and it can be regarded as an good parameter for evaluating adequate fertilization. High ratio illustrates the nitrogen is plentiful, otherwise, it speaks of the poor nitrogen nutrition. For the three species of cyclamen on test, the best ratio is between1.54-1.7. |
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