[Effect of Chelating Agents and Organic Acids on Remediation of Cadmium and Arsenic Complex Contaminated Soil Using ].

In order to improve the phytoextraction efficiency of on farmland soil that had been contaminated by Cd and As, this study explored the effects of chelating agents and organic acids (EDTA, SAP, CA, and MA) on the extraction of Cd and As heavy metals using . The results showed that the four different chelating agents and organic acids had little effect on the biomass of the roots, stems, and leaves of . However, they had different effects on the concentrations and accumulation of Cd and As in various organs of .

[Cd Runoff Load and Soil Profile Movement After Implementation of Some Typical Contaminated Agricultural Soil Remediation Strategies].

Owing to the strong ability to immobilize and hyperaccumulate some toxic heavy metals in contaminated soils, the biochar, lime and such as hyperaccumulator ramie received increasing interests from crops and environment safety in recent years. Outdoor pot experiment was conducted to compare the impacts of lime and biochar addition in paddy rice treatment, hyperaccumulator ramie and ramie combined with EDTA of plant Phytoremediation methods on soil available Cd dynamics in rainfall runoff and the mobility along soil profile, under both natural acid precipitation and acid soil conditions. The results showed that, biochar addition at a 2% mass ratio application amount significantly increased soil pH, while ramie with EDTA application obviously decreased soil pH compared to ramie monoculture.

Field released transgenic papaya effect on soil microbial communities and enzyme activities.

Soil properties, microbial communities and enzyme activities were studied in soil amended with replicase (RP)-transgenic or non-transgenic papaya under field conditions. Compared with non-transgenic papaya, significant differences (P<0.05) were observed in total nitrogen in soils grown with transgenic papaya.

[Analyses of virus resistance and transgenes for transgenic papaya].

Virus resistance in field and molecular biological characterizations of the transgenes were analyzed for two lines of T(1) generation of transgenic papaya with the replicase mutant gene from papaya ringspot virus (PRV). The transgenic plants showed highly resistant or immune against PRV. Results indicated that the transgenes inherited to and expressed at RNA level in the progenies.