Phosphorus-efficient pastures: legume root traits for improved nutrient foraging

R. Haling, Z. Yang, N. Shadwell, R. Simpson, R. Culvenor, A. Stefanski, G. Sandral, Daniel Kidd, Hans Lambers, Megan Ryan

Research output: Chapter in Book/Conference paperConference paper

Abstract

The critical soil phosphorus (P) requirement (P supply for 90% maximum yield) of many temperate pastures is determined by the high P requirements of key pasture legumes (commonly Trifolium or Medicago spp.). Legumes that yield well with a lower critical P requirement could reduce the fertiliser requirement of these pastures. Pot experiments were used to: (i) identify legumes with root traits likely to confer P acquisition efficiency, and (ii) test the impact of these traits on critical P requirement. An initial screen of the root hair length (RHL)
and specific root length (SRL) of 13 legumes and two grasses was undertaken. Growth and root morphology of five legumes (Trifolium subterraneum, T. hirtum, Ornithopus sativus, O. compressus, Biserrula pelecinus) and one grass (Dactylis glomerata) were subsequently compared in detail using a sandy loam soil (8.3 mg/kg Colwell P) that was amended by applying P to the top 5 cm of the soil profile (0, 15, 30, 70, 135, 250 mg P/ kg). Shoot and root growth were assessed after six weeks.
Significant variation in RHL (0.12-0.75 mm) and SRL (98-603 m/g) was found among the legumes, with most being substantially shorter (RHL) or lower (SRL) than the grasses. In the P-response experiment, Ornithopus species (the only legumes with RHL and SRL approaching that of the grasses) had critical P
requirements that were less than half that of T. subterraneum. Selecting legumes that maximise root foraging via long, thin roots with long root hairs may reduce the critical P requirement of pastures.
Original languageEnglish
Title of host publicationBuilding Productive, Diverse and Sustainable Landscapes
Subtitle of host publicationProceedings of the 17th Australian Agronomy
Place of PublicationAustralia
PublisherAustralian Society of Agronomy Inc.
Pages1 - 4
Number of pages4
Volume2015
ISBN (Print)9780646952246
Publication statusPublished - 2015
Event17th Australian Agronomy Conference - Australia
Duration: 20 Sep 201524 Sep 2015

Conference

Conference17th Australian Agronomy Conference
Period20/09/1524/09/15

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forage legumes
foraging
legumes
root hairs
phosphorus
nutrients
grasses
Trifolium subterraneum
pastures
Ornithopus
Trifolium hirtum
Ornithopus compressus
Ornithopus sativus
fertilizer requirements
Medicago
Trifolium
Dactylis glomerata
sandy loam soils
soil profiles
root growth

Cite this

Haling, R., Yang, Z., Shadwell, N., Simpson, R., Culvenor, R., Stefanski, A., ... Ryan, M. (2015). Phosphorus-efficient pastures: legume root traits for improved nutrient foraging. In Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy (Vol. 2015, pp. 1 - 4). Australia: Australian Society of Agronomy Inc..
Haling, R. ; Yang, Z. ; Shadwell, N. ; Simpson, R. ; Culvenor, R. ; Stefanski, A. ; Sandral, G. ; Kidd, Daniel ; Lambers, Hans ; Ryan, Megan. / Phosphorus-efficient pastures: legume root traits for improved nutrient foraging. Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy. Vol. 2015 Australia : Australian Society of Agronomy Inc., 2015. pp. 1 - 4
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abstract = "The critical soil phosphorus (P) requirement (P supply for 90{\%} maximum yield) of many temperate pastures is determined by the high P requirements of key pasture legumes (commonly Trifolium or Medicago spp.). Legumes that yield well with a lower critical P requirement could reduce the fertiliser requirement of these pastures. Pot experiments were used to: (i) identify legumes with root traits likely to confer P acquisition efficiency, and (ii) test the impact of these traits on critical P requirement. An initial screen of the root hair length (RHL)and specific root length (SRL) of 13 legumes and two grasses was undertaken. Growth and root morphology of five legumes (Trifolium subterraneum, T. hirtum, Ornithopus sativus, O. compressus, Biserrula pelecinus) and one grass (Dactylis glomerata) were subsequently compared in detail using a sandy loam soil (8.3 mg/kg Colwell P) that was amended by applying P to the top 5 cm of the soil profile (0, 15, 30, 70, 135, 250 mg P/ kg). Shoot and root growth were assessed after six weeks.Significant variation in RHL (0.12-0.75 mm) and SRL (98-603 m/g) was found among the legumes, with most being substantially shorter (RHL) or lower (SRL) than the grasses. In the P-response experiment, Ornithopus species (the only legumes with RHL and SRL approaching that of the grasses) had critical Prequirements that were less than half that of T. subterraneum. Selecting legumes that maximise root foraging via long, thin roots with long root hairs may reduce the critical P requirement of pastures.",
author = "R. Haling and Z. Yang and N. Shadwell and R. Simpson and R. Culvenor and A. Stefanski and G. Sandral and Daniel Kidd and Hans Lambers and Megan Ryan",
year = "2015",
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Haling, R, Yang, Z, Shadwell, N, Simpson, R, Culvenor, R, Stefanski, A, Sandral, G, Kidd, D, Lambers, H & Ryan, M 2015, Phosphorus-efficient pastures: legume root traits for improved nutrient foraging. in Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy. vol. 2015, Australian Society of Agronomy Inc., Australia, pp. 1 - 4, 17th Australian Agronomy Conference, 20/09/15.

Phosphorus-efficient pastures: legume root traits for improved nutrient foraging. / Haling, R.; Yang, Z.; Shadwell, N.; Simpson, R.; Culvenor, R.; Stefanski, A.; Sandral, G.; Kidd, Daniel; Lambers, Hans; Ryan, Megan.

Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy. Vol. 2015 Australia : Australian Society of Agronomy Inc., 2015. p. 1 - 4.

Research output: Chapter in Book/Conference paperConference paper

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N2 - The critical soil phosphorus (P) requirement (P supply for 90% maximum yield) of many temperate pastures is determined by the high P requirements of key pasture legumes (commonly Trifolium or Medicago spp.). Legumes that yield well with a lower critical P requirement could reduce the fertiliser requirement of these pastures. Pot experiments were used to: (i) identify legumes with root traits likely to confer P acquisition efficiency, and (ii) test the impact of these traits on critical P requirement. An initial screen of the root hair length (RHL)and specific root length (SRL) of 13 legumes and two grasses was undertaken. Growth and root morphology of five legumes (Trifolium subterraneum, T. hirtum, Ornithopus sativus, O. compressus, Biserrula pelecinus) and one grass (Dactylis glomerata) were subsequently compared in detail using a sandy loam soil (8.3 mg/kg Colwell P) that was amended by applying P to the top 5 cm of the soil profile (0, 15, 30, 70, 135, 250 mg P/ kg). Shoot and root growth were assessed after six weeks.Significant variation in RHL (0.12-0.75 mm) and SRL (98-603 m/g) was found among the legumes, with most being substantially shorter (RHL) or lower (SRL) than the grasses. In the P-response experiment, Ornithopus species (the only legumes with RHL and SRL approaching that of the grasses) had critical Prequirements that were less than half that of T. subterraneum. Selecting legumes that maximise root foraging via long, thin roots with long root hairs may reduce the critical P requirement of pastures.

AB - The critical soil phosphorus (P) requirement (P supply for 90% maximum yield) of many temperate pastures is determined by the high P requirements of key pasture legumes (commonly Trifolium or Medicago spp.). Legumes that yield well with a lower critical P requirement could reduce the fertiliser requirement of these pastures. Pot experiments were used to: (i) identify legumes with root traits likely to confer P acquisition efficiency, and (ii) test the impact of these traits on critical P requirement. An initial screen of the root hair length (RHL)and specific root length (SRL) of 13 legumes and two grasses was undertaken. Growth and root morphology of five legumes (Trifolium subterraneum, T. hirtum, Ornithopus sativus, O. compressus, Biserrula pelecinus) and one grass (Dactylis glomerata) were subsequently compared in detail using a sandy loam soil (8.3 mg/kg Colwell P) that was amended by applying P to the top 5 cm of the soil profile (0, 15, 30, 70, 135, 250 mg P/ kg). Shoot and root growth were assessed after six weeks.Significant variation in RHL (0.12-0.75 mm) and SRL (98-603 m/g) was found among the legumes, with most being substantially shorter (RHL) or lower (SRL) than the grasses. In the P-response experiment, Ornithopus species (the only legumes with RHL and SRL approaching that of the grasses) had critical Prequirements that were less than half that of T. subterraneum. Selecting legumes that maximise root foraging via long, thin roots with long root hairs may reduce the critical P requirement of pastures.

M3 - Conference paper

SN - 9780646952246

VL - 2015

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BT - Building Productive, Diverse and Sustainable Landscapes

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Haling R, Yang Z, Shadwell N, Simpson R, Culvenor R, Stefanski A et al. Phosphorus-efficient pastures: legume root traits for improved nutrient foraging. In Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy. Vol. 2015. Australia: Australian Society of Agronomy Inc. 2015. p. 1 - 4