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    The effects of competition between Lotus pedunculatus cv. "Grasslands Maku", white clover (Trifolium repens cv. "Grasslands Huia") and browntop (Agrostis tenuis) at different levels of applied phosphate : a dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science with Honours in the University of Canterbury [Lincoln College]

    Metherell, A. K.
    Abstract
    The effects of competition between browntop (Agrostis tenuis), white clover (Trifolium repens) and Lotus pedunculatus were examined at five levels of phosphate fertilizer applied to a moderately acidic, phosphorus deficient Cass high country yellow brown earth in a glasshouse pot trial. This study demonstrated the ability of L. pedunculatus to outyield white clover at low levels of available soil phosphorus, but at high rates of fertilizer yields of the two species were similar. Although there was an indication that L. pedunculatus had a competitive advantage in terms of phosphorus uptake it did not significantly suppress the growth of white clover. The yield of the mixture of L. pedunculatus and white clover was generally intermediate to those of the two species growing alone. The balance of L. pedunculatus and white clover in the mixture was determined primarily by the level of phosphate fertilizer. Browntop reduced the yields of both legumes but had a greater effect on L. pedunculatus and markedly reduced the percentage of Lotus in the mixtures with white clover. The results are discussed in relation to aluminium toxicity and competition for light, nutrients and soil oxygen.... [Show full abstract]
    Keywords
    Lotus pedunculatus; white clover; Trifolium repens L.; Grasslands Maku; Grasslands Huia; browntop; Agrostis tenuis; phosphate fertiliser; competition; aluminium toxicity; insect pest resistance; soil phosphorus; yield components
    Fields of Research
    070302 Agronomy; 070306 Crop and Pasture Nutrition; 079902 Fertilisers and Agrochemicals (incl. Application)
    Date
    1979
    Type
    Dissertation
    Access Rights
    Digital thesis can be viewed by current staff and students of Lincoln University only.
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    • Theses and Dissertations with Restricted Access [2181]
    • Department of Agricultural Sciences [1407]
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