Allelopathic effects of decaying tobacco leaves on tobacco seedlings

作者：Yi, Jianhua; Jia, Zhihong; Lin, Qi; Lv, Huizhen; Shen, Hong^*

来源：Allelopathy Journal, 2012, 29(1): 51-61.

• Allelochemicals
• benzoic acid
• decaying tobacco leaves
• phthalate

To find the mechanism of soil sickness problem in tobacco continuous cropping, the effects of decaying tobacco leaves and their allelochemicals on the seedlings growth of tobacco were investigated in pot experiments in greenhouse from 2008 to 2010. Results indicated that the decaying tobacco leaves released the allelochemicals (such as benzoic acid and phthalate) and their maximal release occurred 30 to 45-days after incubation. The application of these allelochemicals decreased the activity of antioxidant enzymes (3.9-30.1%) in tobacco roots, reduced the uptake of N, P and K (10.1-37.5%) and inhibited the tobacco growth (27.1-66.3%). Furthermore, the applied allelochemicals also decreased the microbial biomass C and N (13.9-57.5%) and the concentration of available nutrients (9.9-37.2%) in the rhizosphere soil of tobacco seedlings. The magnitude of allelopathic effects followed the order: the mixture of benzoic acid and phthalate > phthalate > benzoic acid > decaying tobacco leaves > control. These results suggested that the decaying tobacco leaves produced allelopathic effects on themselves. After crop harvest, the residual tobacco leaves litter should be removed from the field.

• 出版日期2012-1
• 单位华南农业大学