Investigations into the Intensive System of Grassland Management. By the Agricultural Research Staff of Imperial Chemical Industries, Limited. X. A Further Study of the Mineral Content of Intensively Treated Pasture

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Abstract
1. The mineral content of pasture as grazed under the Intensive System of Grassland Management has been examined. The pasture samples were collected from two centres in 1927 and from one centre in 1929. Magnesium, manganese, iron, sulphur and chlorine were determined in addition to the more common elements. 2. The mineral content of intensive pasture is equal to that of the best type of pasture produced by other systems of management, and superior to that of average good cultivated pasture in Great Britain. 3. The seasonal variations of the soluble ash, potash, soda and phosphoric acid depend principally on the climatic conditions. 4. The effect of drought at one centre has been to lower the percentages of soluble ash, potash and phosphoric acid. 5. Correlations exist between nitrogen and phosphoric acid, and soluble ash and potash. There is no evidence of further correlations between the constituents.