Effect of Compost Amendment on Heavy Metals, Nitrogen and Phosphorus in a Peat-Based Container MediumEnglish Full Text

XIA Yi-Ping1, HE Zhen-Li2,3, P. J. STOFFELLA3, D. V. CALVERT3, ZHANG Ming-Kui2, YANG Xiao-E2 and S. B. WILSON3 1 College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029 (China). 2 College of Environmental Science and Natural Resources, Zhejiang University, Hangzhou 310029 (China) 3 Indian River Research ＆ Education Center, IFAS, University of Florida, Fort Pierce, Florida (USA)

Abstract: A laboratory study was conducted to evaluate the effect of compost amendment on mobility and leaching potential of heavy metals, nitrogen （N） and phosphorus （P） from a peat-based commercial container medium containing 700 g kg-1 peat, 200 g kg-1 perlite and 100 g kg-1 vermiculite at varying amendment rates of compost （0, 0.25, 0.50, 0.75 and 1.00 L L-1）. Increasing compost amendment significantly and linearly increased the pH （P ＜ 0.01）, the total concentrations of organic carbon （P ＜ 0.05）, copper （Cu）（P ＜ 0.01）, cadmium （Cd）（P ＜ 0.01）, and lead （Pb）（P ＜ 0.01）, and increased the bulk density （P ＜ 0.01） of the medium. The electrical conductivity （EC）, and total N and P of the medium increased significantly （P ＜ 0.01） and quadratically with increasing compost amendment. The relationship of the C/N ratio of the medium with the compost amendment rate was decreasing, significant （P ＜ 0.01） and cubic, while that of the total Zn was increasing, significant （P ＜ 0.01） and cubic. Extractable P, NO3-N, and NH4-N increased initially with an increasing compost amendment of up to 0.50 L L-1 and then decreased with further increasing compost rate. Increasing compost rates resulted in a highly significant （P ＜ 0.01） and linear increase in total Cd, Cu, and Pb, and a highly significant （P ＜ 0.01） and cubic increase in total Zn in the medium. Increasing compost rates also significantly （P ＜ 0.01） increased extractable Cu （linearly） and Zn （quadratically）, but significantly （P ＜ 0.01） decreased extractable Pb （linearly）. There was no significant effect of compost amendment on the extractable Cd concentration in the medium. However, with increasing compost rates from 0.25 to 1.00 L L-1, extractability of P, Cd, Cu, Pb and Zn （extractable concentration as a percent of total） was decreased, indicating that compost amendment could lower the leachability of these elements from the medium.

Keywords：

compost amendment; heavy metals; nitrate; peat-based medium; phosphate;

Series：
(B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (D) Agriculture
Subject：
Environment Science and Resources Utilization
Classification Code：
X53

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