COMPARATIVE-STUDIES OF PLANT AND SOIL ANALYSIS FOR THE SULFUR STATUS OF OILSEED RAPE AND WINTER-WHEAT

Recently S deficiency became one of the most widespread nutrient disor ders in North-European agriculture. Therefore precise and reliable met hods for the evaluation of the S nutritional status of agricultural cr ops are required. For the prognosis of the plant available S soil anal ysis be a favourite method, however, no relation between plant S conce ntrations (extractable sulphate plus extractable organic S) S contents in soils could be stated. The reasons for the impracticability of soi l tests seem to be related to interactions between soil water mobile S in soil, so that site specific models need to be developed for the pr ognosis of the S status of agricultural crops.