Inter- and intra-species intercropping of barley cultivars and legume species, as affected by soil phosphorus availability

Tegan Darch*, Courtney D. Giles, Martin S.A. Blackwell, Timothy S. George, Lawrie K. Brown, Daniel Menezes-Blackburn, Charles A. Shand, Marc I. Stutter, David G. Lumsdon, Malika M. Mezeli, Renate Wendler, Hao Zhang, Catherine Wearing, Patricia Cooper, Philip M. Haygarth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Aims: Intercropping can improve plant yields and soil phosphorus (P) use efficiency. This study compares inter- and intra-species intercropping, and determines whether P uptake and shoot biomass accumulation in intercrops are affected by soil P availability. Methods: Four barley cultivars (Hordeum vulgare L.) and three legume species (Trifolium subterreneum, Ornithopus sativus and Medicago truncatula) were selected on the basis of their contrasting root exudation and morphological responses to P deficiency. Monocultures and barley-barley and barley-legume intercrops were grown for 6 weeks in a pot trial at very limiting, slightly limiting and excess available soil P. Above-ground biomass and shoot P were measured. Results: Barley-legume intercrops had 10–70% greater P accumulation and 0–40% greater biomass than monocultures, with the greatest gains occurring at or below the sub-critical P requirement for barley. No benefit of barley-barley intercropping was observed. The plant combination had no significant effect on biomass and P uptake observed in intercropped treatments. Conclusions: Barley-legume intercropping shows promise for sustainable production systems, especially at low soil P. Gains in biomass and P uptake come from inter- rather than intra-species intercropping, indicating that plant diversity resulted in decreased competition between plants for P.

Original languageEnglish
Pages (from-to)125-138
Number of pages14
JournalPlant and Soil
Volume427
Issue number1-2
DOIs
Publication statusPublished - Jun 1 2018

Keywords

  • Barley
  • Legume
  • Phosphorus availability
  • Phosphorus uptake
  • Plant diversity
  • Yield

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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