Dataset: Park Grass Hay Yields, Fertilizer and Lime Treatments 1965-2023

In 1965, "Design Period 3", with a new liming regime, was introduced on Park Grass, having four sub-plots per each plot*: a) at pH 7, b) at pH 6, c) at pH 5 and d) un-limed. This dataset contains the yields of hay (t/ha), for both the 1st and 2nd cuts, harvested from Park Grass Hay Experiment from 1965 to 2023 inclusive. Details of the fertilizer, lime treatments and harvest dates are also included. Yields are provided for all fertiliser treatment plots and sub-plots (except for plots 5, and 6c & 6d, which were used for micro-plot experiments). Yields are expressed as t/ha at 100% dry matter. Variations in yield reflect the various fertilizer treatments and liming regimes, as well as the local weather and atmospheric inputs.

*Plot 12 and 15 did not join this new liming scheme until 1976.