Abstract
In two earlier papers (Henderson, Edwards & Hammerton, 1962a, b) data on the yields of dry matter and crude protein obtained in an experiment carried out at Aberystwyth over the period 1954–56 were presented. The experiment compared the productivity of five leys, each based on a single grass species with white clover, at six levels of compound fertilizer, under a management regime of three cuts per annum. Subsequent to 1956 the fertilizer application and cutting regime were continued, but no yield data were collected. Early in 1960, the experimental area was ploughed up and sown to barley, in order to study the effects of the previous experimental treatments on arable productivity. Barley was also sown in 1961 and 1962, and the present paper is concerned with the yields of the three successive crops of barley.
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