关键词: 黄瓜, 连作, 人工营养基质, 土壤pH值, 酚类物质

Abstract: In order to know the effect of artificial nutrition substrate on continuous cropping obstacle,contents of benzoic acid,p-hydroxybenzoic acid,ferulic acid,vanillin,total phenols and pH were detected in the soil and nutrition substrate with cucumber continuous cropping for 1—19 times.Cucumber seed germination rate was also investigated after treated with water extract of above cultivation medium.Results showed that contents of benzoic acid,p-hydroxybenzoic acid,ferulic acid and total phenols all rose,while pH decreased with the increase of cucumber continuous cropping stubble times.Artificial nutrition substrate alleviated the phenols content rising and pH decreasing.And this effect generally began to produce after continuous cropping for 7 times or 9 times. Meanwhile,nutrition substrate also reduced inhibitory effect of soil water extract on seed germination. That continuous cropping obstacle is alleviated by nutrition substrate may have relation with less phenols accumulation and pH value decrease than soil.

Key words: Cucumber, Continuous cropping, Artificial nutrition substrate, Soil pH value, Phenolic compounds