Evapotranspiration of permanent grasslands in different experimental regimes
1998
Kvitek, T. (Vyzkumny Ustav Melioraci a Ochrany Pudy, Prague (Czech Republic))
In 36 weighable lysimeters actual evapotranspiration (ET) of the grassland in conditions of different water supply of the stand (1991 to 1992), black and green fallow, mulching and regular utilization of the grassland in three soil textures (sandy, loam and peat) was studied. Statistical evaluation of the ET results was performed by multi-factor analysis of variance by the Scheffe test. Statistically significant difference between average ET values of different soils in four of six studied years was recorded. The peat soil was significantly different (highest ET values) from sand and loamy soils. With increasing water content in the soil, the ET values were increasing too also in dependence on the retention capacity of soil profile. The highest ET values were achieved in the two-cut variant or one-cut variant (578.6 mm and 550.4 mm or 501.7 mm) in the peat soil. Mulching was manifested in the loam soil by the lowest ET values in variants with the stand (352.7 mm and 336.7 mm or 376.3 mm).
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