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. 2015 Oct 26;5:15727. doi: 10.1038/srep15727

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Contribution of nitrate, ammonium and amino acids to plant- available N, as obtained by diffusive fluxes, free N (as determined by water extracts) and exchangeable N pools (as determined by KCl extracts); in urea-fertilized (a), organic fertilized (b) and unfertilized soil (c). Data are derived from 40 replicate probes and corresponding soil samples at each site. Error bars are standard error of the mean, lower case letters represent significant differences (P < 0.05) within each soil.