Study On Standardization Technology For Cultivating H.radix

Currently as a major medicine source, the cultivated Hedysari radix roots, however, had no uniformstandard in the whole process of seedling culture, transplant and harvest of medical roots, resulting indifferent and ragged medical roots in yield and quality. In this study, the sowing time, sowing quantity,transplant density, fertilization ratio and optimal harvest time for its medical roots were studied under thelocal caltivated pattern in the main local producing areas as Wudu district of Longnan city of Gansu inorder to explore the standardization cultivating technology and provide evidence for setting up GAP base.The results are summarized as follows:1. Under different time and various seed quantity of sowing, the seedling emergence trait, growth anddevelopment, seedling yield and quality were studied. The result showed that the sowing time and theseed quantity in sowing had significant effect on the seedling yield and quality of the plant, indicatingApril10or so as the local optimum sowing date and80kg/hm²of seeds as the optimum sowing quantityin this prefecture.2. H. radix was cultivated under different transplant density （30cm of row space and10,15,20,25and30cm of plant space）. The result showed that when the row space was30cm, the plant populationyield reduced significantly with the plant space widening, but the officinal yield and quality for theindividual plant increased in evidence. Under25cm of the plant space, the transplant survived rate wasthe highest with strong plants, highest ratio of the under to the above, thick main stem, higher yield andgood quality for individual plant with fewer side roots, long and big main roots, resulting in excellentofficinal roots. When compared with the density as30cm×30cm, the officinal yield increased by14.8%in the fresh weight and by14.8%in the dry weight. The above reveals that the density as30cm×25cm ofrow and plant spaces, i.e.133thousand plants per hectare adapted to the H. radix cultivation in the southof Gansu.3. By using the "3414" Fertilization scheme, the growth and medicinal materials yield of H.radixwere studied.The results showed that the fertilization ratio for cultivating H.radix was N₂P₀K₂in the southof gansu province, with60:0:60kg/hm²of ratio in N：P：K, especially the K is conducive in improving theplant yield.4.The dynamic change of growth and the main efficacy component content of the plant roors werestudied by harvesting H.radix medicinal materials in different periods.The results showed that the optialharvest time for the plant roots was October20thor so, during which the water content and total ashcontent in the medical roots were the lowest and relatively stable, while the extraction content reached themaximum.5. The effect of topping on yield and quality of H.radix medicinal roots were studied by cutting offthe stem35cm on May2, June2and July2during its growth period,respectively.The result showed thatwhen compared with the result of non topping, it was excellent for the plant to cultivate if topped in earlyMay and the main stem height kept at30to40cm, revealing that the topping was an effective measure forprompting shoots and improving production and quality of medicinal materials of the plant.