Regulation Effects of Microbial Agents on Growth and Nutrient Uptake of Continuous Cropping Tomato
In this experiment,continuous cropping tomato soil and tomato seedlings were used as materi-als,Rhizophagus intraradices,Pseudomonas fluorescens and Trichoderma harzianum were inoculated in soil,and the effects of single and combined microbial agents on regulating soil nutrients,plant nutrient absorption and growth promotion were studied.The results showed that compared with the control,the contents of nitro-gen,phosphorus and potassium in tomato continuous cropping soil inoculated with microbial agents increased with most of which up to significant levels.The soil alkali-hydrolytic nitrogen,available phosphorus and availa-ble potassium contents under the treatment of R.intraradices+P.fluoresceosa+T.harzianum(MPT)were in-creased by 118.67%,129.91%and 130.57%,respectively.The enzyme activities in the soils inoculated with microbial agents increased in different degrees,and the activities of urease and acid phosphatase in the treat-ment of R.intraradices+T.harzianum(MT)were significantly higher than that of the control by 163.79%and 196.92%,respectively.The activity of sucrase in MPT treatment was 99.39%higher than that in the con-trol.The number of culturable bacteria and actinomycetes in the soil under each microbial agent treatment in-creased significantly,while that of fungi decreased significantly.The calcium content in tomato plants signifi-cantly increased in each microbial agent treatment,which was 64.21%higher in the MPT treatment than the control,and the root activity was significantly enhanced.In conclusion,soil inoculated with microbial agents could increase the contents of alkaline hydrolyzed nitrogen,available phosphorus and available potassium un-der conditions of continuous cropping tomato,as well as the contents of nutrient elements of N,P,K,Ca and Mg in plants,increase soil microbial community richness and soil enzyme activities,enhance root activity and promote plant growth of tomato,so alleviate the impact of continuous cropping obstacles on tomato growth.
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