Effects of three amendments on the growth of <i>Codonopsis tangshen</i> and soil biochemical properties in a continuous cropping system

• Main Authors: ZHOU Wu-xian, LIU Cui-jun, HE Yin-sheng, WU Hai-tang, DUAN Yuan-yuan, WEI Hai-ying, AI Lun-qiang, ZHANG Mei-de
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2021-01-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: soil amendment; continuous cropping; <i>codonopsis tangshen</i>; growth; soil biochemical property
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2021/1/20210106.htm

A field experiment with four treatments(control(CK), organic manure(OM), microbial fertilizer(MF), and silicon-calcium-potassium-magnesium fertilizer(SCPM))was conducted to investigate the effects of three amendments on the growth and rhizospheric soil biochemical properties of <i>Codonopsis tangshen</i> in a continuous cropping system to provide scientific basis and technical support for alleviating the continuous cropping obstacle of <i>C. tangshen</i>. Results showed that the SPAD values of the <i>C. tangshen</i> leaf under the OM, MF, and SCPM treatments were enhanced by 41.2%, 20.7%, and 47.4%, respectively, compared with the control. The OM and SCPM treatments significantly increased <i>C. tangshen</i> yield by 20.2% and 13.8%, respectively. The OM and MF treatments remarkably increased the polysaccharide content by 9.3 and 6.2 percent points, and the MF treatment significantly increased the lobetyolin content by 18.3%. The three amendments had different effects on the rhizospheric soil biochemical properties of <i>C. tangshen</i>. After the application of OM and SCPM, the soil pH was increased by 0.28,0.14 units, and the exchangeable aluminum content of the soil was decreased by 8.7% and 19.9%, respectively, compared with the control. The MF treatment significantly decreased the soil organic matter content by 12.0% compared with the control. The available potassium content of the soil was increased by 107.5%, 23.2%, and 32.6% under the OM, MF, and SCPM treatments, respectively, compared with the control. The SCPM treatment remarkably increased bacterial abundance and decreased fungal abundance of the rhizospheric soil of <i>C. tangshen</i>; the ratio of bacteria/fungi abundance was increased by 5038 times compared with the control. All the three amendments generally enhanced the photosynthetic capacity of <i>C. tangshen</i> and had different effects on plant growth and rhizospheric soil biochemical properties. The OM and SCPM treatments improved <i>C. tangshen</i> yield, whereas the MF treatment increased the lobetyolin content of <i>C. tangshen</i>. The comprehensive analysis showed that the improvement effect of the three amendments on <i>C. tangshen</i> growth followed the order of OM(4500 kg·hm^-2)> MF (750 kg·hm^-2)> SCPM (750 kg·hm^-2).