Retraction Note to: Water Air Soil Pollut (2019) 230: 26

https://doi.org/10.1007/s11270-019-4081-5

The authors have retracted this article. After publication they became aware that the data for cattle manure biochar reported in this article are actually data for rice straw biochar. The results, discussion and conclusions are therefore invalid. All authors agree with the retraction.