Effect of magnesium fertilisers and season on levels of inorganic nutrients in a pasture on Hamilton clay loam

摘要

Various magnesium fertilisers applied at rates equivalent to 4 cwt Epsom salts per acre on a pasture on Hamilton clay loam. containing 1.3 m.e. exchangeable Mg, produced only very small increases in mixed herbage magnesium levels, ranging on average from 3 (dolomite and calcined dolomite) to 7 (calcined magnesite) over a period of two-and-a-half years. The increases were of the same order as predicted by the square roots of the ratios of the soil Mg levels.