The effect of water deficits during flowering and seed production on cultivars of subterranean clover and annual medic

E. C. (Ted) Wolfe, William Collins, R. C. Rossiter, W. R. Stern

    Research output: Book chapter/Published conference paperConference paperpeer-review

    Abstract

    In improved pastures in inland southern Australia, the persistence and growth of annual pasture legumes depends in part on their ability to produce and conserve abundant seed for regeneration and production. For near-maximum seed production in spring, adequate soil water is needed for at least 70 days in subterranean clover (Trifolium subterraneum) and medic (Medicago) species. Water deficits during spring are a common occurrence, and they appear to be increasing in frequency. The effect of relatively short periods of water deficit during reproductive development has received some attention but the findings conflict. The present experiment was conducted to examine further the responses of subterranean clover to water deficits imposed during there productive phase, and to compare the response of medic to that of subterranean clover. The flowering of two early strains of subterranean clover (Northam, Daglish) was synchronised with two early-flowering cultivars of annual medic (Cyprus barrel medic and Harbinger strand medic). Seed production parameters were observed on four watering treatments (nil, early, mid and late deficits during the reproductive phase). Notable differences occurred between the two genera and between the water treatments in their effect on reproductive development. A highly significant interaction favouring medic was recorded between the legumes (clover, medic) and the early deficit treatment, in that the individual seed weight of medic was slightly enhanced by water stress and clover was significantly depressed. In the mid- and late-stress treatments, a significantly lower proportion of viable seed was recorded with clover versus medic. The implications of the findings for the use of adapted annual legumes are discussed. This research was supported by a Reserve Bank Research Fellowship.
    Original languageEnglish
    Title of host publicationJoint XXIV International Grassland and XI International Rangeland Kenya 2021 Virtual Congress
    Subtitle of host publicationCongress Proceedings - Oral Papers
    EditorsJoseph G. Mureithi, Moses M. Nyangito, Jane W. Wamuongo, Jesse Njoke, Elkana M. Nyambati
    Place of PublicationKenya
    PublisherAustralian Society of Agronomy
    Pages630-635
    Number of pages6
    Volume1
    ISBN (Electronic)9789966300935
    Publication statusPublished - 2021
    EventThe XXIV International Grassland Congress / XI International Rangeland Congress - Virtual
    Duration: 25 Oct 202129 Oct 2021
    https://igandircongress2021.dryfta.com/index.php (Conference website)
    https://www.kalro.org/igc-irc2021congresskenya/ (Conference website)
    https://igandircongress2021.dryfta.com/program/140-october-25th-2021-day-1 (Conference program)

    Conference

    ConferenceThe XXIV International Grassland Congress / XI International Rangeland Congress
    Abbreviated titleSustainable use of grassland and rangeland resources for improved livelihoods
    Period25/10/2129/10/21
    OtherJoint XXIV IGC and XI IRC congress will be held in Nairobi, Kenya, October 25 – 29, 2021. The theme of the Congress is "Sustainable Use of Grassland and Rangeland Resources for Improved Livelihoods'. The aim of the congress will be to promote the interchange of scientific and technical information on all aspects of grasslands and rangelands: including grassland and rangeland ecology; forage production and utilization; livestock production systems; wildlife, tourism and multi-facets of grassland and rangeland; drought management and climate change in rangelands; pastoralism, social, gender and policy issues and capacity building, extension and governance.
    The International Grassland Congress promotes interchange of information on all aspects of natural and cultivated grasslands and forage crops for the benefit of mankind, including sustained development, food production and the maintenance of biodiversity.

    The aim of the International Rangeland Congress is to promote the interchange of scientific and technical information on all aspects of rangelands: research, planning, development, management, extension, education and training.
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