Journal article
Hydraulic lift by canola plants aids P and K uptake from dry topsoil
Australian Journal of Agricultural Research, Vol.59(1)
2008
Abstract
The role of hydraulic lift in nutrient uptake from dry topsoil is unclear. Vertically-split root systems were used to measure hydraulic lift and phosphorus (P) and potassium (K) uptake at the rosette and flowering stages of two canola (Brassica napus L.) cultivars (Trigold and Boomer with small and large root systems, respectively) grown in soil low in P and K. Rubidium (Rb) was used as a tracer to examine K uptake from K fertiliser banded in dry topsoil. During vegetative growth, statistically significant hydraulic lift was measured, irrespective of cultivar root size or a specific nutrient (P or K) placed in the topsoil. The Rb tracer revealed significant amounts of K were absorbed from the dry soil, but at rates five-fold lower than from the moist soil. The water lifted could not prevent cessation of P uptake by Boomer and a reduction in P uptake by Trigold. During mid to late flowering, ion uptake from the dry topsoil was impeded despite the continuation of hydraulic lift up to 28 days after the topsoil was dried. Minimal fine root growth following topsoil drying (and reduction in fine root biomass in some treatments) appeared to be the primary cause of impeded nutrient uptake.
Details
- Title
- Hydraulic lift by canola plants aids P and K uptake from dry topsoil
- Authors/Creators
- T.J. Rose (Author/Creator) - The University of Western AustraliaZ. Rengel (Author/Creator) - The University of Western AustraliaQ. Ma (Author/Creator) - The University of Western AustraliaJ.W. Bowden (Author/Creator) - Government of Western Australia
- Publication Details
- Australian Journal of Agricultural Research, Vol.59(1)
- Publisher
- CSIRO
- Identifiers
- 991005540004907891
- Copyright
- © CSIRO 2008.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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InCites Highlights
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.473 Soil Phosphorus Dynamics
- Web Of Science research areas
- Agriculture, Multidisciplinary
- ESI research areas
- Agricultural Sciences