Drivers of Phosphorus Efficiency in Tropical and Subtropical Cropping Systems

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cg.contributor.affiliationInternational Center for Tropical Agricultureen
cg.coverage.countryAustralia
cg.coverage.countryKenya
cg.coverage.iso3166-alpha2AU
cg.coverage.iso3166-alpha2KE
cg.coverage.regionAustralia and New Zealand
cg.coverage.regionEastern Africa
cg.creator.identifierJob Kihara: 0000-0002-4394-9553en
cg.creator.identifierBirthe Paul: 0000-0002-5994-5354en
cg.creator.identifierMario Herrero: 0000-0002-7741-5090en
cg.identifier.doihttps://doi.org/10.3390/proceedings2019036013en
dc.contributor.authorDas, Biancaen
dc.contributor.authorHuth, Neil I.en
dc.contributor.authorProbert, Merven
dc.contributor.authorPaul, Birthe K.en
dc.contributor.authorKihara, Job Magutaen
dc.contributor.authorBolo, Peter Omondien
dc.contributor.authorRodríguez, Danielen
dc.contributor.authorHerrero, Marioen
dc.contributor.authorSchmidt, Susanneen
dc.date.accessioned2020-01-20T15:33:08Zen
dc.date.available2020-01-20T15:33:08Zen
dc.identifier.urihttps://hdl.handle.net/10568/106628
dc.titleDrivers of Phosphorus Efficiency in Tropical and Subtropical Cropping Systemsen
dcterms.abstractPhosphorus (P) is an essential nutrient but is commonly limiting for food production in tropical and subtropical maize cropping. The efficiency of P fertiliser uptake is often low (5–30%) for various site-specific reasons and so identifying the drivers of P efficiency for different systems is important. We conducted a sensitivity analysis on the parameters of a well-established cropping systems model (APSIM) for a wide range of soil, crop and management factors to understand their influence on yield. The analysis was conducted for two contrasting maize cropping systems: (a) a high-input, large-scale commercial system in subtropical Queensland, Australia and (b) a low-input, small-holder system in tropical, western Kenya. In Queensland, yield was most sensitive to available P and mineral N supply, and the sensitivity of both increased with in-crop rainfall. Available P was also the most important parameter in Western Kenya, but N supply had much weaker influence due to higher levels of organic matter. Parameters controlling P sorption were more important than other soil parameters at both sites irrespective of seasonal conditions. In conclusion, these results suggest that efforts to improve efficiency of P use by plants need to account for interactions between water and N supply in environments where these are limiting. They also highlight a potential constraint to modelling of these systems as some of the most influential parameters are difficult to measure directly.en
dcterms.accessRightsOpen Access
dcterms.available2019-12-30en
dcterms.bibliographicCitationDas, Bianca; Huth, Neil; Probert, Merv; Paul, Birthe; Kihara, Job; Bolo, Peter; Rodriguez, Daniel; Herrero,Mario & Schmidt, Susanne. (2019). Drivers of Phosphorus Efficiency in Tropical and Subtropical Cropping Systems. Presented at the third International Tropical Agriculture conference (TROPAG 2019), Brisbane, Australia, 11-13 November 2019. 36,13.en
dcterms.extent36,13en
dcterms.issued2019-12-30en
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherMDPIen
dcterms.subjectkenyaen
dcterms.subjectaustraliaen
dcterms.subjectsoilen
dcterms.subjectphosphorusen
dcterms.subjectefficiencyen
dcterms.typeConference Paper

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