Continuous cropping obstacles often lead to a decline in the quality and yield of Chinese medicinal materials, and crop rotation can effectively alleviate the obstacles to continuous cropping. There are currently few studies on crop rotation of Chinese medicinal materials. With the expansion of the astragalus planting area, the continuous cropping obstacle has become a serious problem affecting the yield and quality of astragalus. In the genuine areas of astragalus, there are serious root rot diseases in Mongolia, Gansu and Shanxi. Therefore, the continuous cropping obstacles of the astragalus were studied. Causes and mitigation methods are imperative.
Recently, the well-known international soil science journal Applied Soil Ecology (SCI Second District) published an online publication titled”Different crop rotation systems change the rhizosphere bacterial community structure of Astragalus membranaceus (Fisch) Bge.” var. mongholicus (Bge.) Hsiao” research paper (http://doi.org/10.1016/j.apsoil.2021.104003). The study, combined with Illumina MiSeq high-throughput sequencing technology and bioinformatics, determined that the astragalus-oat rotation is the best way to effectively alleviate the continuous cropping obstacles of astragalus, providing a theoretical basis and application prospects for standardized ecological planting of astragalus and root rot control .
The research started in 2014. A 6-year field experiment was carried out in Wuchuan County, the main producing area of Mongolian Astragalus membranaceus. Simultaneous greenhouse pot experiment was conducted to explore Astragalus membranaceus and different crops (rape, potato, oats, scutellaria) after rotation The incidence of root rot, soil nutrient content and rhizosphere microbial diversity changes, it was found that after astragalus and oats rotation, astragalus plants grew healthy and yielded higher, and the soil nutrient content (organic matter, total nitrogen, available phosphorus, The content of available potassium has increased significantly, and the soil nutrients are sufficient. At the same time, the rotation with oats increases the number of beneficial bacteria such as Clostridia, Rubrobacterales and Micromonosporales in the rhizosphere soil of Astragalus, which is conducive to the growth and quality of Astragalus. That is, the rotation of astragalus and oats is a reasonable rotation measure to alleviate the continuous cropping obstacles of astragalus. The results of this study can provide technical support for the ecological planting and standardized production of astragalus, and provide reference and reference for solving the continuous cropping obstacles of other traditional Chinese medicines.
2019 PhD student Li Bingzhen is the first author of the paper, and Professor Chen Guilin is the corresponding author of the paper. This research was supported by the National Natural Science Foundation of China and the Applied Technology Research and Development Fund of the Inner Mongolia Department of Science and Technology. It was also supported by an independent project from the Key Laboratory of Forage and Feature Crop Biology of the Ministry of Education.