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Objective: To evaluate the effect of seedingtime, density of crop and fertilization on the yield of Angelica dahurica., Method: Use weighing method to measure the output of A. dahurica., Result: The highest yield of seeding-time is 8373 kg/hm' on April 20, which is considerably different compared with April 5 and May 5; the highest yield of the density is 9300 kg/hm2 on 330,000 plants/hm2; the yield of fertilization tests all are considerable higher than that of the contrast., Conclusion: The appropriate seeingtime of A. dahurica is the first or second ten days of April, the appropriate density is 330,000 plants/hm2, and the appropriate amount of fertilization is N24P20, i.e pure N 360 kg and P20, 300 kg per hectare.

Objective: To give some theory support of Cistanche tubulosa cultivation by searching dry matter accumulation and echinacoside content of C. tubulosa., Method: Dry matter accumulation content of C. tubulosa culturing in Huabei plain was analysed in different growth season of C. tubulosa. Echinacoside content was determined by HPLC., Result: Dry matter accumulation of C. tubulosa showed "S" variation. Dry matter accumulation increased fastest in September among growing seasons. Dry matter amount was 138.58 g after C. tubulosa grew a year. Dry matter amount decreased significantly along with inoculation time retarded. Echinacoside content was 30.59% when C. tubulosa grew in 5 months, decreased guadully after that, and 9.76% in annual., Conclusion: Variation rule of dry matter accumulation and echinacoside content was found in C. tubulosa that grew one year in Huabei plain.

Objective: To understand the process of Cistanche tubulosa., Method: The process of seed germination and parasitism was observed using stereomicroscope., Result: Seedling of C. tubulosa sprouted after forty day without host root's contact in fields, a tube-like-organ formed and grew auger-type from host root, the tuber apex where touches host root swelled and formed haustorium. Haustorium intruded host root epidermis and vascular bundles, and released brown substances. Then, embryo bud with six or more young leaves formed, finally the swelled tuber-like-organ broken and seed coat shed. Due to the parasitism of C. tubulosa, the host root near stem site swelled, but the other part, shrunk and disappered gradually., Conclusion: Seed of C. tubulosa could germinate indepently in fields. Tuber-like-organ formatin, haustorium formation and bud formation are key steps of C. tubulosa seedling development.

Objective: To study the effect of cultivation techniques on the flower yield flavonoid content in Chrysanthemum flower grown in Hebei., Method: Studied on flowers yield and three factors (transplanting date and plant density and fertilizer quantity) were examined in field experiment at 4 treatments levels., Result and Conclusion: The best results were obtained at following conditions: diammonium phosphate 300 kg x hm(-2) and potassium sulfate 150 kg x hm(-2) fertilized before transplanting, transplanting at the first ten days of May and the spacing 40 cm x 40 cm.

Objective: To increase inoculation rate of Cistanche tubulosa in the field by studying inoculation technologies., Method: Root-tube inoculation methed was used on field experiments. Inoculation rate of C. tubulosa was compared to different size seeds and inoculation mediums and inoculation time., Result and Conclusion: May is suitable inoculation time. The inoculation rate of C. tubulosa is 92.5% while the seed width is more than 0.7 mm and coarse sand is selected during inoculation period.