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Published (Version of record)CC BY-NC-ND V4.0, Open Access
Published (Version of record)CC BY-NC-ND V4.0, Open
Journal article
Recovery of nitrogen fertiliser by drill-sown rice crops using best management practice: a 15 N-labelled urea study
Crop & pasture science, Vol.online early
12/07/2022
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Source: InCites
Abstract
Context. Optimising nitrogen (N) management strategies for drill-sown rice crops is essential for minimising input costs for growers and reducing the environmental impact of rice production. Aims. The study aimed to determine the recovery of fertiliser-N in drill-sown Australian rice crops, following current N fertiliser recommendations where two-thirds of the N is applied at sowing (pre-flood) and one-third at panicle initiation. Methods. 15 N-labelled urea was used to quantify N recovery by field-grown rice crops on a Sodosol and a Vertosol, and to determine the contributions of fertiliser-N applied pre-flood vs that applied at panicle initiation to total N fertiliser recovery on the Vertosol. Results. Recovery of 15 N fertiliser in grain + straw was ~50% of applied N on both soils, with a further 20% recovered from roots and soil to a depth of 30 cm. Recovery of N fertiliser applied at panicle initiation (59%) was significantly higher than of N fertiliser applied pre-flood (43%), likely due to the presence of actively growing roots and higher plant N demand. Crops that received N fertiliser took up more native soil N than unfertilised crops on the Vertosol; hence, apparent fertiliser N recoveries were 10–15% higher than N fertiliser recovery determined using 15 N-labelled urea. Conclusions. The recovery of 50% of fertiliser-N in aboveground plant material indicates that N fertiliser use efficiency in drill-sown rice is similar to that of dryland cereal crops in Australia when best management practice guidelines for N fertiliser use are followed.
Details
- Title
- Recovery of nitrogen fertiliser by drill-sown rice crops using best management practice: a 15 N-labelled urea study
- Creators
- Terry J Rose - Southern Cross UniversityLee Kearney - Southern Cross UniversityBrian W Dunn - Yanco Agriculture InstituteTina S Dunn - Yanco Agriculture Institute
- Publication Details
- Crop & pasture science, Vol.online early
- Publisher
- CSIRO
- Identifiers
- 991013053812902368
- Academic Unit
- Centre for Organics Research; Faculty of Science and Engineering; Science; Southern Cross Plant Science
- Language
- English
- Resource Type
- Journal article