Nitrogen concentration in different N fractions in soils receiving vegetal (VO) or animal-based (AO) organic fertilizer and their respective mineral controls (VMC and AMC, vegetal and animal mineral controls, respectively)*. *, ^{†, ‡}See Fig 1.

<p>Nitrogen concentration in different N fractions in soils receiving vegetal (VO) or animal-based (AO) organic fertilizer and their respective mineral controls (VMC and AMC, vegetal and animal mineral controls, respectively)*. *, ^{†, ‡}See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0161619#pone.0161619.g001" target="_blank">Fig 1</a>.