Further Observations on the Nitrogenous Manuring of Grassland

An account is given of three years’ observations on plots of permanent grass managed according to the “New System of Grassland Management”, which consists essentially of periodic dressings of nitrogenous manures followed by rotational grazing. Results obtained by keeping records of the grazing provided and by sampling the plots show that the dominating factor on total yield has been rainfall. In the wet season 1930 the output of dry matter was about 80 per cent. more than in the dry year 1929: the extra grazing was about 46 per cent. The increased grazing due to the nitrogenous manures (three dressings per annum each of 1 cwt. sulphate of ammonia per acre) has, on the average, been estimated at between 20 and 30 per cent. above the controls. This increase, however, has not been accurately measured.