Study on the effect of urea combined with DMPP in controlling cadmium accumulation in Panax notoginseng
In this paper,the effects of urea with different levels of nitrification inhibitor 3,4-dimethylpyrazole phosphate(DMPP)(1％,3％,and 5％of nitrogen applied)on soil cadmium(Cd)morphology,Panax notoginseng growth and plant Cd enrichment and translocation were studied by exogenously adding Cd(5 mg·kg-1)in a pot experiment,in order to clarify the mechanism of its inhibition and control of Cd accumulation in P.notoginseng.Single application of urea resulted in 0.70 decrease in soil pH,while urea combined with DMPP increased soil pH by 1.05 to 1.24,and the soil NH4-N content increased with the increase of the DMPP application.Single application of urea increased the content and proportion of soil exchangeable Cd,resulting in higher Cd activity in the soil,while the application of DMPP promoted the transformation of soil Cd from the highly active exchangeable state to the less active residue state.The Cd contents of stems,leaves and plants in P.notoginseng were the highest under CK treatment,while the Cd content in P.notoginseng roots was the highest under single application of urea,indicating that nitrogen application reduced the transport of Cd from roots to shoots.The application of urea combined with DMPP increased the leaf length,leaf width,plant height and biomass of P.notoginseng,and drastically reduced the Cd contents in roots,stems,and leaves.The comprehensive analysis revealed that urea combined with 1％DMPP had the best effect.Therefore,urea combined with DMPP could increase the pH of rhizosphere soil,reduce soil Cd activity,thus inhibiting the accumulation of Cd in P.notoginseng.
万方数据
维普
