Aiju, L., Honghai, W., Peiling, G., & Hong-zhi, X. (2013). Chemical Fractionation Of Cu And Zn And Their Impacts On Microbial Properties In Slightly Contaminated Soils. International Journal of Agricultural Research, Innovation and Technology, 3(1), 20–25. https://doi.org/10.3329/ijarit.v3i1.16045