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  1. No Access

    Article

    Assessment of biological nitrogen fixation in grassland and associated sites

    The extent of nitrogen fixation in native grassland on clay soil was measured using the C2H2 reduction assay. Undisturbed soil cores incubated in microcanopies in the field indicated fixation rates of 2 kg N/ha p...

    K. Vlassak, E. A. Paul, R. E. Harris in Plant and Soil (1973)

  2. No Access

    Article

    Selection of clonal potato seedlings at three widely separated locations

    From 210 first clonal generation potato seedlings tested at three widely separated locations 41 different seedlings were selected the first year. Of these only two were selected at more than one location and n...

    R. E. Harris, H. T. Davies, H. B. Cannon in American Potato Journal (1967)