[Study on growth and dry substance accumulation of Curcuma longa].

OBJECTIVE: To explore the growth characteristics of Curcuma longa, and provide basis for standardized cultivation. METHOD: Plant samples were collected and investigated periodically. RESULT: According to the growth of different parts and the characteristics of dry substance accumulation of C. longa, the development of C. longa could be divided into five stages: emergence of seedlings, seedling, leaf, root tuber expansion, and dry substance accumulation of root tuber. In terms of number, leaf of C. longa increases gradually from one at first to eight at the final stage. Leaf size increases at a very low speed at the stage of seedling. However, leaves expands their sizes at a much higher speed at the stage of leaf. The dry substance in different parts accumulates increasingly with the development of C. longa dry substance mainly accumulates in leaves at the stage of leaf, and in rhizome at the stage of root tuber expansion. At the final stage, it mainly accumulates in root tuber. CONCLUSION: Cultivation technologies of C. longa and the relevant management methods could be established according to the growth of different parts of C. longa and the characteristics of dry substance accumulation in different stages.

[Effects of seeding and sowing methods on the yields of root tubers of Curcuma longa].

OBJECTIVE: To provide a scientific basis for standardizing the cultivation method for Curcuma longa. METHOD: Plant heights and seeding numbers were sampled periodically, the plot yields were counted a tharvested. RESULT: The effects of seeding method on yields, plant height and number were significant. The effects of different sowing ways on the yields were very little. CONCLUSION: The hole seeding method using mother tuber or blastostyle bearing three to four knots was shown to be the best may, worthy to be widely applied in production.