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Báo cáo " Effects of biosolids application on soil chemical properties in peri-urban agricultural systems "

The application of biosolids as a fertilizer in agricultural cultivation are common practices in many countries. This study investigates the effects of such practices in field experiments on Fluvisol and Acrisol soils in peri-urban Hanoi City. We compared biosolidfertilized vegetable/rice-dominated systems (biosolids | VNU Journal of Science Earth Sciences 24 2008 202-212 Effects of biosolids application on soil chemical properties in peri-urban agricultural systems Nguyen Manh Khai1 Pham Quang Ha2 Nguyen Cong Vinh3 Jon Petter Gustafsson4 Ingrid Oborn5 1 College of Science VNU 2 Insitute for Agricultural Environment Phu Do Tu Liem Hanoi Vietnam IAE 3 National Institute for Soils and Fertilizers Hanoi Vietnam NISF 4 Department of Land and Water Resources Engineering Royal Institute of Technology KTH 5Dept. Crop Production Ecology Swedish University of Agricultural Sciences SLU Received 5 November 2008 received in revised form 26 November 2008. Abstract. The application of biosolids as a fertilizer in agricultural cultivation are common practices in many countries. This study investigates the effects of such practices in field experiments on Fluvisol and Acrisol soils in peri-urban Hanoi City. We compared biosolid-fertilized vegetable rice-dominated systems biosolids applied as chicken manure Acrisol in Vinh Phuc Province or composted pig manure mixed with rice straw Fluvisol in Ha Tay Province . The biosolids were applied at six different rates representing from 0 to 450 of the normal annual dose used by local farmers. The application of biosolids had highly significant positive effects on organic carbon TOC and total nitrogen Ntot when the six different treatments of composted manure and chicken manure were compared. The soil reverse aqua regia-extractable Rev Aq Reg Zn increased linearly with biosolids application rate at both sites and the linear regression showed Zn mg kg-1 112.5 13.25x10-3xcomposted manure t ha-1 r2 0.58 or Zn mg kg-1 43.77 35.04x10-3xchicken manure t ha-1 r2 0.73 whereas Cu Rev Aq Reg only increased significantly at the Vinh Phuc site. The Cd and Pb Rev Aq Reg concentration is not clearly different from the control after short-term one time application of biosolids. The application of biosolids increased the EDTA-extractable fraction of Cd Cu and Zn but had