[Effects of micro-fertilizers foliar spray on the content of main effective components of Angelica dahurica]. / 叶面喷施微肥对川白芷主要有效成分含量的影响.

The zinc, boron and molybdenum were sprayed on the foliage of Angelica dahurica du-ring the vigorous growth period to explore the effects of the combination of zinc, boron and molybdenum fertilizers on the content of main effective components of A. dahurica, and to find out the optimum spraying amount. The results showed that the application of zinc, boron and molybdenum foliar spray was beneficial to increase the content of imperatorin and total cumarin, whereas had no effect on the content of the isoimperatorin. The effect of boron spray on the accumulation of imperatorin and total coumarin was the most significant, followed by the zinc and molybdenum. The interaction between boron and molybdenum had a negative cooperative effect on the content of imperatorin, while the interaction between zinc and molybdenum had a positivecooperative effect on the content of total coumarin. The contents of total coumarin reached over 0.7% respectively, with the complex fertilizer spray of zinc at 0.15-0.24 kg·hm-2, boron at 2.02-2.36 kg·hm-2 and molybdenum at 0.08-0.13 kg·hm-2. The contents of imperatorin reached over 0.2% respectively, with the complex fertilizer spray of zinc at 0.15-0.20 kg·hm-2, boron at 1.37-1.47 kg·hm-2 and molybdenum at 0.09-0.13 kg·hm-2. It was concluded that the application of zinc, boron and molybdenum foliar spray was beneficial to promote the quality of A. dahurica by enhancing its accumulation of coumarin.

[Correlation of Agronomic Character of Panax notoginseng in Guangxi with Soil Physical and Chemical Properties].

Objective: To study the effect of physicochemical characteristics of soil on Panax notoginseng agronomic character, in order to offer the theory for selecting an appropriate soil to cultivate Panax notoginseng, and to build the production bases. Methods: To test and analyze Panax notoginseng agronomic character, to analyze the form of layered soil particles, p H value and soil fertility. At the same time, the analysis of Panax notoginseng plant height, leaf number, the length of taproot, the width of taproot, stem diameter, the width of residual part of stem, rootlet number, root fresh and dry weight and drying rate were carried out. Results: Panax notoginseng agronomic character had a large difference. The length of roots, the width of roots and a large number of rootlets had a promoting effect on accumulating biological yield. Nevertheless, the numbers of branches had no obvious impact on accumulating biological yield. Most of soil texture were silty clay or light clay of silty clay. Physical clay and coarse silt could promote the growth of Panax notoginseng. Sand grain had significant effect on Panax notoginseng growth. A reasonable use of nitrogenous fertilizer had a prominent promoting effect on the width of the medicine's root. In fact, the use of phosphorus potassium also had a great impact on Panax notoginseng growth. Conclusion: Panax notoginseng should be planted on the light clay which are loose and can irrigate and drain conveniently and contains many silty. The heavy clay soil which are defective aeration and contain cosmid has a bad influence of the growth of Panax notoginseng. It will cause a decrease of the yield of medicinal materials. Using nitrogenous fertilizer aptly also is an effective way to improve the quality and yield of Panax notoginseng.