Starting out from the results of extensive grassland experiments made in 40 years of professional work and from search in the relevant literature, an attempt was made to draw up a yield and quality model for grassland sites in the North-East German lowland area. For this, major influencing factors were evaluated and combined in a module by joining several databases. Validation of the results shows usable agreement between the measured yield and quality data and the calculated ones. The average absolute yield variation between the pairs of variates was 8.4 dt DM × ha 71 (1 dt = 100 kg), and the variation in quality was 0.4 MJ NEL kg DM 71 and 19.8 g CP kg DM 71 , respectively. Seven input data (site, climate, nutrient supply, water regime, vegetation type, nitrogen fertilization, intensity of use) for site characterization and intensity of management must be available when using the model.
ObjectiveWhen changing the land use in larger grassland areas or in landscapes with certain grassland portions, data on the impacts on forage yields and quality are essential prerequisites for efficient planning and economic calculations.A wide methodological basis to describe the organizational and functional principles of land use systems is required for assessing the effects of land use in larger areas and for developing
Data on the moisture level of grassland sites have traditionally been based on the water supply levels according to Petersen (1952) in east German relevant technical literature. The question was to what extent these data are comparable to Ellenberg's widely-known moisture indicator values. The transformation scale for water supply levels and moisture values suggested in this paper was based on more than 500 grassland relevés collected in the German federal states of Brandenburg and Mecklenburg-Western Pomerania. The water supply levels were appraised according to the bioindicative method by Hundt (1964). There was a high rank correlation coefficient between average moisture values and water supply levels (r Spearman = 0.939). The water supply levels were related to the following amplitudes of the average moisture values: W57/47: 5 3.5; W37: 3.
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