Study On Improving The Quality Of Astragalus Sinicus L. By Nutrient Solution And Growth Retardant

Soilless cultivation is a technology that can be applied to provide nutrient to plant not in natural soil but in the nutrient solution that contains the necessary elements for the growth of plants; with this technology, the plants can pass its whole life cycle in the normal way. In soilless cultivation, whether a reasonable proportion and moderate concentration of nutrient solution can be provided is the key which can lead to the success of the cultivation. Astragalus sinicus L., annual herb, belongs to Leguminosae of Astragalus family. Because it can cover the ground in winter when other chlorophyte disappear, and it also has the value to be appreciate, it can be utilized and developed as a chlorophyte.Ningbo da qiao—one breed of Astragalus sinicus L.was used in this experiment. According to research on concentration of nutrient solution and plant growth retardant, the concentration of nutrient solution and plant growth retardant fitting in with its growth were selected out in this thesis. The results were as follows:①Six concentrations of nutrient solution were adopted in this experiment. After analysis data about effect of every treatment of concentration on growth indexes of Astragalus sinicus L., the treatment 8s is more suitable for its growth.②Different concentration treatment of Uniconazol and Paclobutrazol optimized the population structure of Astragalus sinicus L.. The plant height got shorter and the leaf color deepened; however, the effect of inhibition was poor at lower level of concentration. 200mg/L Paclobutrazol treatment has better effect of height control, and 150mg/L is the next. The better concentration of Uniconazol to control the height is 200mg/L, the next is 100mg/L. Secondly, Uniconazol and Paclobutrazol treatment can both increase the resistance of Astragalus sinicus L. effectively. After all-round consideration of the effect of two factors on Astragalus sinicus L., the optimal concentration is 200 mg/L Paclobutrazol treatment and 100mg/L Uniconazol treatment, and effect of the former is better.③In view of comprehensive evaluation, the apparent quality of Astragalus sinicus L.was quite good after treated with 200mg/L(PP333), the next is 100mg/L (S3307).