[Study on variety test of Iris tectorum new variety of CSG1].

OBJECTIVE: Iris tectorum new varieties of CSG1, CSG2, CSG4, CSG5, CSG6, CSG7, CSG8 and CSG9 were bred by system selection from abundant germplasm resources. METHODS: Taking conventional variety as the control, comparison test for these new varieties was arranged in Shuangliu, Zhongjiang, Maoxian, Renshou and Anxian in Sichuan. Plot yields were measured after harvesting, yields per mu were calculated and the data were analyzed with DPS 9.50 software. RESULTS: CSG1 had the highest yield which was significantly higher than the control and other varieties. This new variety had passed through the field identification by Sichuan Provincial Crop Variety Approval Committee in 2013 and would be applied for approval in 2014. CONCLUSION: CSG1 is the first batch of Iris tectorum new variety identified by domestic authority and has great promotion potential.

[Effects of spraying uniconazole on plant morphology and total alkaloid content of Aconitum carmichaeli].

OBJECTIVE: To study the effects of spraying uniconazole on plant morphology and total alkaloid content of Aconitum carmichaeli for providing theory base for establishment of planting measure. METHODS: The mainly morphological character and total alkaloid content of Radix Aconiti Lateralis Praeparata were studied under different uniconazole spraying time and density. RESULTS: Unieonazole could decrease plant height and leaf area, increase stem diameter, leaves and fibril roots, and the amount of dry matter. The difference in total alkaloid was not significant. CONCLUSION: In this experiment,Spraying uniconazole has no significant effect on total alkaloid content of Aconitum carmichaeli. It is better for increasing yield per plant to applied 120 mg/L unieonazole at sub-root enlargement stage than sub-root formation stage, and it is better to applied the same density at another stage for adjusting the plant morphology.

[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.