| The medical plant as Rheum tanguticum relys on wild resources for its medicine supplement but lacking of key techniques in artificial cultivation. In order to reveal the cultivated technology, several cultivated measures for the plant were studied based on field experiments in Zhuoni county, Ganlzhou of Gansu. The main results are as follows:1. Different sowing quantity(30-50 kg/hm2) test results showed that the root length of seeding and individual quality of the plant roots were best in sowing quantity of 40 kg/hm2 with 2.42% of total anthraquinone and the root diameter, single root weight and root numbers exhibited best in the treatment of 45 kg/hm2. Considering comprehensively, the sowing quantity ranged from 40 to 45 kg/hm2 was good for culturing R. tanguticum in the area.2. Different sowing date(April 1st to May 10th) test results showed that the yield indicators of the seedlings and the medical roots decreased with the sowing time delay. When sowed on April 1st, the root seedlings and the total anthraquinone content inside were the highest. The root length and diameter were all the best when sowed in April 10 th and the seedling numbers exhibited the most when sowed in April 20 th. The seedlings cultivated under early sowing condition were propitious to the root quality and accumulation of the effective components. Considering the seeding quality, medicinal yield and the total anthraquinone content, the adaptive sowing time should be from April 1st to April 10 th in the area.3.The fertilization experiment based on the ?3414? fertilizing design were done with nitrogen, phosphorus and potassium. the results showed that that the effect of the fertilization on the plant yield and economic benefits ranked as the fertilized> the non-fertilized, NPK> P> N> K and the interact effect ranked as NP> PK> NK, PK> NP> NK, respectively. The total anthraquinone, ash and water content in the all treatments were all up to the the Pharmacopoeia of People’s Republic of China except for the excessive nitrogen treatment. Fitting of ternary quadratic equation, binary quadratic equation and quadratic equation with the plant yield and economic benefits were all typical, which could better exhibited the relationship of the fertilization quantity to the yield and economic benefits respectively. Comprehensively considering, the fertilization program with 12384.3 kg/hm2 of the highest yield under the local experimental conditions was 74.06 kg/hm2 of N, 55.07 kg/hm2 of P and 36.56 kg/hm2 of K respectively. The fertilization program with the best economic benefits was 73.10 kg/hm2, 53.39 kg/hm2 and 36.47 kg/hm2 of N, P and K respectively resulting in 12012.6 kg/hm2 of THE medical roots. The recommended qualtity for the fertilizers was 73 ~ 90 kg/hm2, 53- 60 kg/hm2 and 32-37 kg/hm2 of N, P and K respectively.4. Different sowing density test showed that the indicator as the population leaf area index, single root yield and quality exhibited best under the density condition with 90 cm of row space and 75 cm of plant space resulted in 2.97% of the anthraquinone content.5. Different harvest date test based on high performance liquid chromatography analysis showed that the medical roots of the plant growed for two years could not be up to the standard of the Chinese pharmacopoeia in all ingredient contents but for the products harvested after July 25 th growed for three years. The plants growed four and five years were all up to the Pharmacopoeia. The medical roots had higher water in late growth stage but had not any hollow inside, indicating that the plants growed for four years were the best ones for the medical use and the best harvesting time was after October 25 th. |
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