Maize root exudates alleviated allelopathic inhibttion of phenolic acids in soil of continuous cropping peanut

doi:10.19802/j.issn.1007-9084.2019114

Abstract

LI Qing-kai，LIU Ping*，ZHAO Hai-jun，SONG Xiao-zong，LIN Hai-tao，SHEN Yu-wen，LI Lin， WAN Shu-bo* . Maize root exudates alleviated allelopathic inhibttion of phenolic acids in soil of continuous cropping peanut[J]. 中国油料作物学报, 2019, 41(6): 921-.

References

To explore the mechanism of maize//peanut intercropping alleviate peanut continuous cropping ob? stacles, effect of maize root exudates was explored in maize//peanut intercropping system on allelopathy of phenolic acids in soil of continuously cropped peanut. Maize root exudate was extracted at tasseling stage by CH2Cl2 (dichloro?methane). Then it was added into soil containing different concentrations of 3 main phenolic acid compounds mix?ture (cinnamic acid, phthalic acid and p-hydroxybenzoic acid). Soil micro-environment was investigated. Results demonstrated allelopathic inhibition by phenolic acids on soil microbial biomass, microbial activity, enzyme activity and nutrient content. Additional corn root exudates increased respiration rate, enzyme activity, microbial biomass and nutrient content of the phenolic acids-treated soils. Especially, under low concentration phenolic acid treat? ments, they increased by 7.58%, 6.73%, 7.72% and 4.90% on average respectively, compared with the treatment of phenolic acids during the whole culture period. Root exudates from maize reduced the allelopathic index of phenolic acids on various indexes of soil with a larger decrease in the treatment of low concentration. The allelopathic index
of soil microbial biomass carbon and nitrogen content, microbial activity, enzyme activity and nutrient content treat? ed with maize root exudates decreased by 21.57%, 21.19%, 26.32% and 20.95% on average respectively. Among the 3 sample batches, the allelopathic effects of phenolic acids first increased and then weakened, and each treat? ment reached the strongest on the 10th day; while the effect of maize root exudates on the allelopathic effect of pheno? lic acids was the strongest on the 5th day, and then showed a weakening trend. These results indicated that the root exudates of maize could alleviate the allelopathic effect of phenolic acids on soil micro-ecological environment to a certain extent, which provided a theoretical basis for maize//peanut intercropping in alleviating peanut continuous cropping obstacles.
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