The researches were carried out during 2006-2009 on the preluvosoil from Agricultural Research and Development Station Oradea in the research field for soil water balance study. The preluvosoil from the research field is characterized by the presence of the horizons Bt1 (34-54 cm depth) and Bt2 (54-78 cm depth); the colloid clay eluviation determined to appear the El horizon with 31.6% colloid clay. The source of irrigation water was a drill of 15 m depth. The chemical parameters of the irrigation water were the following: fixed mineral residue 0.5 g/l; SAR index 0.52; CSR index= -1.7%; N. Florea class = II; there are not some problemes regarding the use of irrigation use. Water use efficincy (WUE) was determined as a report between yield (kg/ha) and water consumption (m3/ha). In the irrigated variant the soil water reserve was maintained between easily available water content (2240 m3/ha) and field capacity (2782 m3/ha) on watering depth (0-75 cm). Crop technology was the optimum one: foreruner was the wheat, chemical (N160P120K80) and organic (40 t/ha) fertilizers were used, the treatments against the diseas and pests were applied in function of the needs. The irrigation determined the increase of the daily water consumption; total water consumption increased too. There were the yield gains very significant statistically every year; the percentage of the big tuberous in the yield increased with 12% and the water use efficiency increased in comparison with unirrigated variant with 35%. The increase of the water consumption, the yield gains very significant statistically obtained every year, the increase of the big tuberous percentage in the yield and the improve of the water use efficiency are the arguments for irrigation opportunity in the Crisurilor Plain. The researches were carried out in the project: PN-II-ID-PCE-2008; 1103/2009 ”Study of the relationships in the soil-water-plant-atmosphere system on the land affected succesivelly by excess and deficit of moisture from North Western Romania regarding the improve of the yield quantity and quality”.

potato; water use efficiency; irrigation

Presentation: oral