Effects of nitrogen reduction and biochar on strawberry growth and fruit quality under continuous cropping
In order to investigate the effect of nitrogen fertilizer reduction and biochar application on the growth and fruit quality of continuous cropping strawberry,'Red Cheek'strawberry(Fragaria × anansissa)was used as the experimenta material in the strawberry greenhouses with eight years of continuous crop-ping.And the experiment was set up with six groups of treatments:control(CK,N0),conventional nitrogen application(210 kg·hm-2,N100),20％nitrogen reduction(168 kg·hm-2,N80),20％N reduction+3％biochar(N80+BC),40％N reduction(126 kg·hm-2,N60),40％N reduction+3％biochar(N60+BC),and 3％biochar addition(6.3 kg·hm-2).The effects of different treatments on strawberry growth and development and fruit quality were compared.The results showed that with the reduction of N fertilizer application,the plant height,dry and fresh weight of above and below ground parts,net photosynthetic rate of leaves,chloro-phyll content,soluble sugar content,total nitrogen content of leaf and root,GDH,GS,GOGAT activities of leaf and root,yield per plant,soluble solid content,total sugar content and vitamin C content of strawberry gradually decreased,but the N reduction and the application of biochar significantly improved the above indexes.Compared with N80 treatment,the plant height,fresh weight of above ground part,fresh weight of underground part,net photosynthetic rate of leaves,chlorophyll content,soluble sugar content,total ni-trogen content of leaves,total nitrogen content of roots,GDH,GS,GOGAT and GS activities of leaves in N80+BC treatment were increased at nutritive growth stage,flowering and fruiting stage and fruit harvest-ing stage.The yield per plant increased by 95.06％;soluble solid content increased by 22.63％;total sugar content increased by 7.47％;vitamin C content increased by 5.68％.There was no significant difference in the above indexes between N80+BC treatment and N100 treatment.Therefore,the application of biochar could improve the quality of strawberry and reduce the amount of nitrogen fertilizer applied under the con-dition of strawberry continuous cropping,thus realizing the"reduction and increase efficiency"of nitrogen fertilizer management in the process of strawberry cultivation.
NETL
NSTL
万方数据
