Erratum to: Nutr Cycl Agroecosyst (2012) 92:91–105 DOI 10.1007/s10705-011-9474-9

In the original publication of the article, some sections were cited liberally from the previously published work. Authors regret for this error and would like to include the following sentence under the “Statistical Analysis” in the “Materials and Methods” section:

“Analyses of the yield response model and economically optimum fertilizer rates, were carried out following the procedure described by Valkama et al. (2011)”.