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dc.contributor.authorAllen, DE
dc.contributor.authorBloesch, PM
dc.contributor.authorOrton, TG
dc.contributor.authorSchroeder, BL
dc.contributor.authorSkocaj, DM
dc.contributor.authorWang, W
dc.contributor.authorMasters, B
dc.contributor.authorMoody, PM
dc.description.abstractWe explored soil properties as indices of mineralisable nitrogen (N) in sugarcane soils and whether we could increase the accuracy of predicting N mineralisation during laboratory incubations. Utilising historical data in combination with samples collected during 2016, we: (i) measured mineralised N over the course of short-term (14 days) and long-term (301 days) laboratory incubations; (ii) compared models representing mineralisation; then (iii) related model parameters to measured soil properties. We found measures representing the labile organic N pool (Hydrolysable NaOH organic N; amino sugar Illinois soil N test) best related to short-term mineralised N (R2 of 0.50–0.57, P < 0.001), while measures of CO2 production (3, 7, 10 and 14 days) best related to longer-term mineralised N (R2 of 0.75–0.84, P < 0.001). Indices were brought together to model the active and slow pools of a two-pool mineralisation model in the statistical framework of a mixed-effects model. Of the models that relied on measurement of one soil property, cumulative CO2 production (7 days) performed the best when considering all soil types; in a cross-validation test, this model gave an external R2 of 0.77 for prediction of the 301-day mineralised N. Since the mixed-effects model accounts for the various sources of uncertainty, we suggest this approach as a framework for prediction of in-field available N, with further measurement of long-term mineralised N in other soils to strengthen predictive certainty of these soil indices.
dc.publisherCSIRO Publishing
dc.relation.ispartofjournalSoil Research
dc.subject.fieldofresearchEnvironmental Sciences
dc.titleNitrogen mineralisation in sugarcane soils in Queensland, Australia: I. evaluation of soil tests for predicting nitrogen mineralisation
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationAllen, DE; Bloesch, PM; Orton, TG; Schroeder, BL; Skocaj, DM; Wang, W; Masters, B; Moody, PM, Nitrogen mineralisation in sugarcane soils in Queensland, Australia: I. evaluation of soil tests for predicting nitrogen mineralisation, Soil Research, 2019, 57 (7), pp. 738-754
gro.hasfulltextNo Full Text
gro.griffith.authorWang, Weijin

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