[Soil moisture reserve establishment and fluctuations in common chernozems of the Ukraine in winter [Designing of an instrument to indicate irrigation dates on the basis of changing moisture movement direction in soil from the descending to the ascending one]]

calendario de los riegos calendrier des irrigations chernozem chernozems conception design hiver instrument instrumentos instruments invierno irrigated soils irrigation scheduling monitoring mouvement de l'eau dans le sol movimiento del agua en el suelo soil water movement suelo irrigado surveillance vigilancia winter