Effect of continuous cropping on the rhizosphere soil and growth of common buckwheat

ABSTRACT

Common buckwheat is a health-care crop, and continuous cropping is one of the main factors restricting its high-yielding. In order to clarify the mechanism of continuous cropping of buckwheat, 4, 5and 6 years continuous cropping treatments were set up. We obtained the following results. The available nutrients content in rhizosphere soil, soil enzyme activity, leaf area, chlorophyll and soluble protein content, the peroxidase(POD) activity of leaves, agronomic traits, root index (except average diameter) of Fengtian1(FT1) decreased significantly with the increase of continuous cropping years. While, soil pH and the number of fungi in rhizosphere soil increased significantly, the number of bacteria in rhizosphere soil and the activity of catalase (CAT) and superoxide dismutase(SOD) in leaves first increased and then decreased. The yields of continuous cropping for 6 years were 12 times lower than the control crop. In conclusion, continuous cropping has certain effects on growth and yields of buckwheat.

KEYWORDS:

• Common buckwheat
• continuous cropping years
• rhizosphere soil
• plant traits
• root system
• yield

Acknowledgments

We are grateful to the National Natural Science Foundation of China (31560358), the Science and Technology Support Plan of Guizhou province, China (QianKeHe ZhiCheng [2018]2297)and[2019]2297), the Major Research Projects of Innovation Groups of Guizhou (QianJiaoHe KY Zi [2017]033) and[2018]015), Joint Project of Natural Science Foundation of China and Guizhou Provincial Government Karst Science Research Center (U1812401), the Earmarked Fund for China Agricultyre Research System (CARS-07-A5).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the The Science and Technology Support Plan of Guizhou province, China [QianKeHe ZhiCheng [2018]2297)and[2019]2297];The Major Research Projects of Innovation Groups of Guizhou [QianJiaoHe KY Zi [2017]033) and[2018]015];The National Natural Science Foundation of China [31560358];Joint Project of Natural Science Foundation of China and Guizhou Provincial Government Karst Science Research Center [U1812401];The Earmarked Fund for China Agricultyre Research System [CARS-07-A5];