Differentiation of the irrigation regime on soils with groundwater supply from dammed river plain

The soils from dammed meadow present a groundwater reservoir at low depths on much of the territory, giving plants a consistent supply of water raised by capillarity. The volume of groundwater intake differs according to a complex of conditions: depth of ground water level, soil texture, crop, the vegetation stage of the plant. Experimental determinations, performed on physical models (lysimeters) and in the field, in dammed meadow Big Island of Braila, established the parameters of the phreatic input, for the main agricultural crops, remarkable useful in the management of irrigation. The irrigation regime in the meadow is applied differentially referring to the number of watering, the watering norms, the interval between watering, depending on the hydrogeological framework. Thus, at the depths of groundwater below 1 m, the crops do not irrigate, at 1.5 m depths apply 1-2 waterings with norms of 500-600 m3 / ha, at depths of 2 m apply 2-3 waterings and at depths larger than 2.5-3 m apply 3-4 waterings. In the paper are presented the experimental results obtained that have grounded the technology of differential application irrigation on the meadow soils of the Big Island of Braila, with an area of 72.000 hectares