Effects of Intercropping on the Growth of Panax notoginseng and the Nut-rients and Microorganisms in Rhizosphere Soil
In order to explore the ecological planting techniques of Panax notoginseng,the effects of intercropping patterns of Panax not-oginseng and taro on the growth of annual Panax notoginseng were studied.A field plot experiment was conducted to set up two planting modes,namely,intercropping of Panax notoginseng and taro,and monocropping of Panax notoginseng.Determine the agronomic charac-ters,incidence,rate seedling survival rate,leaf enzyme activity,leaf pigment content,soil nutrients,and microbial count of Panax notogin-seng under two planting modes.The results showed that the intercropping of Panax notoginseng and taro could effectively promote the gro-wth of Panax notoginseng compared with monocropping.Under the intercropping mode,the leaf area and healthy seedling index of Panax notoginseng were significantly increased by 19.67％and 28.13％,respectively,and the seedling survival rate was increased by 10.33％.The incidence rate of Panax notoginseng monocropping was 3.09 times that of Panax notoginseng/taro intercropping.During the period from August to September,the chlorophyll a and chlorophyll b of Panax notoginseng under the intercropping mode were 1.78 times and 1.83 times that of monocropping,respectively.However,the content of malondialdehyde(MDA)in the leaves of Panax notoginseng under mono-culture was significantly higher than that under intercropping,and the degree of leaf damage was relatively large.The number of bacteria,fungi,and actinomycetes in the rhizosphere soil under intercropping mode increased by 105％,176.3％,and 182.9％,respectively,compared to monocropping.In addition,the available potassium,available phosphorus,and total potassium content in the soil under intercropping mode were significantly higher than those in monocropping soil,increasing by 10.8％,15.77％,and 2.32％,respectively,but the alkali-hy-drolyzable nitrogen content was significantly reduced by 19.82％.In short,intercropping Panax notoginseng and taro can increase the num-ber of soil microorganisms and improve the soil nutrient status.Integrating the growth status of Panax notoginseng can promote the con-struction and application of an ecological planting mode of Panax notoginseng.
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