Agricultural Science Euro-North-East

Scientific journal
of the North-East Regional Agricultural Scientific Centre

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Water regime of drying sod-podzolic gleyey sandy soil

Pages: 35-40.

Abashev V.D., DSc in agriculture, head of laboratory

North-East Agricultural Research Institute, Kirov, Russia


Aim of the work – to study influence of closed potters drainage on regime of ground waters' level and humidity of sandy soils; estimation of dynamics of producing moisture storage in 1 meter soil layer in different lands. Observation on ground water level (GWL) was conducted with data holes placed 2.0…2.3 m deeps in the middle of a line between interceptors. Soil humidity was estimated by weight method till 1 m deep in 10 cm layers. Drainage flow was detected in data holes with volume method. Perennial variation (1983-2014 gg.) in GWL was governed with climatic factors mainly with dynamics of atmospheric precipitations. During seasonal variation there were spring and autumn rising, summer and winter recessions of the GWL. Till winter it was on the depth more than 1 meter but in spring rises up to plough-layer for a little time. In humid years GWL of growth season was changed within 84…100 cm, in arid years – within 149…174 cm, and in average years – within 116…128 cm. Possibility of rising of perched groundwater into plough-layer is about five times every 20 years.  It was some higher in lowering sites than in slopes or plain Arable land has higher GWL than forest. Humidity of drained soil varies within broad limits – from full moisture capacity in early spring, fall and at intensive precipitations till wilting humidity in arid periods. Soil humidity was close to optimal one in humid and average humid years. Water supply of cultivated plants was governed with amount of precipitation. Increase in humidity along with soil depth was pointed out in timothy field. The highest level of humidity was in layers 60…80 and 80…100 cm in all periods of observation. Water storages reset in October-November and in period of spring melting of snow. At these times they exceed field moisture capacity. Forest soil humidity is much lower than arable soil humidity under perennial grasses and in pure fallow land.

Keywords: closed drainage, ground water level, soil humidity, producing moisture, drainage flow, arable land, coniferous forest


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