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    Water extraction and use of seedling and established dryland lucerne crops

    Sim, Richard E.
    Abstract
    The main aim of this research was to refine best management practices for dryland lucerne (Medicago sativa L.) crops in relation to crop water extraction. To do this, dryland lucerne was established at Lincoln University, New Zealand in two soils which differed in the plant available water content (PAWC). The low PAWC site (Ashely Dene) had a very stony silt loam soil with ~130 mm of water to 2.3 m. The high PAWC site (Iversen 12) is a deep silt loam soil with ~360 mm of water to 2.3 m. The available water for crop extraction in the establishment year was manipulated by imposing the second treatment, sowing date. This resulted in mean annual dry matter (DM) yields which ranged from 0.4 to 21.5 t DM/ha. A detailed examination of lucerne physiology was undertaken to determine how lucerne extracts water from the soil to explain these yield differences.... [Show full abstract]
    Keywords
    dryland; water stress; evaporation; extraction front velocity; grazing management; leaf area index; lucerne; Medicago sativa; photoperiod; phyllochron; radiation interception; radiation use efficiency; transpiration
    Fields of Research
    070306 Crop and Pasture Nutrition; 0703 Crop and Pasture Production
    Date
    2014
    Type
    Thesis
    Collections
    • Doctoral (PhD) Theses [887]
    • Department of Agricultural Sciences [1445]
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