Growth of oats, beet and rape in four serpentine soils

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Abstract
Oats, beet and rape were grown in soils from Scottish serpentine sites at Green Hill, Hill of Towanreef and Keen of Hamar, and from a Swedish site at Kittelfjäll. Experiments using Ca, NPK and CaNPK supplements showed marked differences between species in their response. The results suggested that the Keen of Hamar soil may be slightly toxic, the Green Hill and Hill of Towanreef soils are usually more toxic, and the Kittelfjäll soil is extremely toxic. Soil analyses and plant response indicated that the cause of acute toxicity is high concentration of magnesium in combination with low concentration of calcium.