Journal article
Post-flowering supply of P, but not K, is required for maximum canola seed yields
European Journal of Agronomy, Vol.28(3), pp.371-379
2008
Abstract
The effect of limited P or K supply during and after flowering on canola (Brassica napus L.) seed yields is not known. To determine the growth stage at which canola had accumulated sufficient P or K for maximum yields, we conducted two sand culture experiments in which external P (Experiment 1) or K (Experiment 2) supply was removed at four growth stages (GS 4.7; GS 4.9-5.5; GS 6.2 and maturity). Two levels of P/K supply (adequate or high) were included in each experiment. Plants had accumulated enough K by early flowering (GS 4.7) for maximum seed yields at both adequate and high K supply. Under high P supply, canola plants had accumulated sufficient P by early flowering (GS 4.7) for maximum yields. Under adequate P supply, yield loss occurred when P was removed at early flowering (GS 4.7), predominantly due to a combination of fewer siliques and fewer seeds per silique on branches. Yield loss when P supply was removed at late flowering (GS 4.9-5.5) was due to fewer seeds per silique on branches. Early P removal caused more P remobilization from vegetative organs to the seed. When K was supplied until later growth stages, K concentration in the silique walls increased under both adequate and high K supply. Stem K concentrations also increased under high supply. The results suggest that when P supply is near-limiting, canola requires a continued supply of P post-flowering for maximum seed yields.
Details
- Title
- Post-flowering supply of P, but not K, is required for maximum canola seed yields
- 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
- European Journal of Agronomy, Vol.28(3), pp.371-379
- Publisher
- Elsevier BV
- Identifiers
- 991005540014707891
- Copyright
- © 2007 Elsevier B.V.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.424 Crop Yield Optimization
- Web Of Science research areas
- Agronomy
- ESI research areas
- Agricultural Sciences