Dependence of drainage runoff on the thickness of humus soil layer

Abstract

The agro-reclamation significance of thick tamed tillable layer is that it can imbibe the large part of spring flood season and rainwater without creating humidity excess. It has been defined that the humus layer of 30-40 cm can accumulate 50-60 mm of rainwater, not creating humidity excess, and the 18-20 cm layer will be already too humid under such conditions. The lisimetric researches showed that the trials should be continued in the drained area under the field conditions. Long-termed researches showed that the thickening of the soil influenced the size of runoff modules. The maximum drainage runoff modules were 1,5 times larger in the field with thickened soil than those from the field with naturally thick soil and reached 1,80 l/s ha in 1998. The thickening of the tillable layer has the ecological meaning as well.