Effects of patchouli-mint rotation and patchouli continuous cropping on its quality and rhizosphere soil microecology
[Objective]Effects of rotation of patchouli[Pogostemon cablin(Blanco)Benth.]and mint(Mentha haplocalyx Briq.)and contin-uous cropping of patchouli on the quality and rhizosphere soil microecology of patchouli were studied,to provide the basis for alleviating the continuous cropping obstacle of patchouli and its application in production.[Method]The cutting seedlings of patchouli and mint seedlings were used in the field experiment.There were three treatments:patchouli continuous cropping group(planting patchouli for two consecutive years),patchouli and mint crop rotation group(mint was planted in the first year and patchouli was planted in the second year),control group(no crop was planted in the first year,and patchouli was planted in the same field in the second year after harvest).The main agro-nomic traits,antioxidant enzyme activities in leaves,patchouli alcohol content,physical and chemical properties of rhizosphere soil,microbi-al quantity and enzyme activities were measured at different growth stages of patchouli.[Result]When the patchouli plant had grown for 180 days,the main agronomic traits(plant height,stem diameter,number of primary branches,number of leaves,chlorophyll content,leaf are-a)and alcohol content of patchouli in rotation group were significantly higher than those in continuous cropping group(P＜0.05).The ac-tivities of peroxidase and superoxide dismutase of leaves in patchouli were respectively 54.23％(P＜0.05)and 115.71％(P＜0.05)high-er in the rotational crop group compared with the continuous cropping group.Soil physical and chemical properties(pH,organic matter,a-vailable P,hydrolyzable N,available K)of patchouli rhizosphere in rotation group were significantly higher than those in continuous crop-ping group.The number of soil bacteria and actinomycetes in rotation group increased by 98.95％(P＜0.05)and 71.61％(P＜0.05),re-spectively.However,the number of soil fungi in the crop rotation group was reduced by 48.86％(P＜0.05)compared to the continuous crop group;The activities of soil peroxidase and urease in rotation group increased by 827.66％(P＜0.05)and 655.00％(P＜0.05)com-pared with the continuous cropping group,the activity of soil sucrase and polyphenol oxidase in rotation group was 44.49％(P＜0.05)and 28.99％(P＜0.05)lower than that in continuous cropping group.[Conclusion]The agronomic traits,patchouli alcohol content and soil mi-cro-ecological index of patchouli and mint rotation were better than those of patchouli continuous cropping.
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