Changes in mean hay yield at Palace Leas for the FYM (20 t ha-1) and four ammonium sulphate-containing fertilizer treatments for the first 5 years of the experiment (1897–1901) and the more recent long-term average (1976–2015).

Changes in mean hay yield at Palace Leas for the FYM (20 t ha-1) and four ammonium sulphate-containing fertilizer treatments for the first 5 years of the experiment (1897–1901) and the more recent long-term average (1976–2015).