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    On-farm comparision of pasture production in relation to rainfall in central Otago

    Kearney, J. K.; Moot, Derrick J.; Pollock, Keith M.
    Abstract
    Dry matter (DM) yields of unimproved resident browntop-dominant pasture on three Central Otago dryland farms was <1.5 t /ha/year from 2008-2010. An intensive pasture renewal programme over >18 000 ha applied lime to increase soil pH to ≥5.8 and reduce aluminium to <1.5 mg/kg. The resident vegetation was sprayed in autumn before spring drilling of perennial ryegrass/white clover pastures or lucerne monocultures. After renovation, ryegrass pastures yielded 3.1-5.3 t DM/ha and lucerne produced 4.2-8.4 t DM/ha. Yields of improved pastures were affected by the soil moisture stored during autumn and winter and spring rainfall. Together these gave a water use efficiency of ~16.0 kg DM/ha/mm for lucerne compared with 3.5 kg DM/ha/ mm for browntop dominant pasture. Quantifying and explaining yield improvements on-farm in relation to rainfall and soil moisture deficits provide a transferable basis for interpretation of results at other sites.... [Show full abstract]
    Keywords
    cocksfoot; Otago; browntop; tall fescue; lucerne; perennial ryegrass; white clover; dryland pasture
    Date
    2010
    Type
    Conference Contribution - Published (Conference Paper)
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    • Department of Agricultural Sciences [1445]
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    Kearney_Moot_&_Pollock_2010.pdf
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    Copyright © The Authors and New Zealand Grassland Association.
    Citation
    Kearney, J. K., Moot, D. J. & Pollock, K. M. (2010). Proceedings of the New Zealand Grassland Association, 72, 121-126
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