Alternate row sowing: A novel approach to maintain sown species in mixed pasture swards

Graeme Sandral, Tony D Swan, Guangdi Li, Laura Goward, Mark B. Peoples, Richard Hayes

Research output: Book chapter/Published conference paperConference paper

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Abstract

Establishing and maintaining a balanced mixture of perennial and annual pasture species is often difficult, especially in drier environments. One method to reduce the competition between pasture species and to improve the potential productivity and nitrogen fixed by the pasture is to establish pasture species in separate rows (alternate row sowings). An experimental field site was established in the autumn of 2012 near Mirrool in southern NSW. Medicago sativa and Phalaris aquatica were sown in combination with a range of annual legumes either as a monoculture, mixture, or arranged in alternate rows in 1:1 or 1:2 ratios. Legumes were inoculated with appropriate rhizobia and the sites were fertilised with Starter 15 at 150 kg/ha. Seedling establishment, regeneration and dry matter (DM) were measured each year until 2014. Annual legume seed reserves and nitrogen fixation (N-fix) were measured in 2013. Alternate row sowing improved seedling regeneration and annual legume seed reserves in some situations; however, it did not significantly improve mean DM, mean legume DM or N-fix. In contrast the choice of species combinations impacted on these responses. For example, the inclusion of P. aquatica in the pasture mix tended to increase mean DM, although if N-fix and mean legume DM were to be maintained at acceptable levels, M. sativa and Trifolium subterraneum were important inclusions in combination with P. aquatica.
Original languageEnglish
Title of host publication17th Proceedings of the Australian Agronomy Conference
Place of PublicationWarragul; Victoria; Australia
PublisherAustralian Society for Agronomy
Pages1-4
Number of pages4
Publication statusPublished - 2015
Event17th Australian Agronomy Conference - Wrest Point Convention Centre , Hobart, Australia
Duration: 20 Sep 201524 Sep 2015
http://2015.agronomyconference.com/

Conference

Conference17th Australian Agronomy Conference
Abbreviated titleBuilding Productive, Diverse and Sustainable Landscapes
CountryAustralia
CityHobart
Period20/09/1524/09/15
Internet address

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