By the performed researches, the optimization of crop technology, water supply and best genotype was followed, with a view to achieve maximum soybean yield in the south of the country, under economical efficiency and environment preservation. Thus, after joining Romania to EU, the obtainment of economically yields and in respect of environment preservation is a major objective. There were no similar researches performed in Mostistea Plain and for maize. The researches were performed during 2005-2007, in Mostistea Plain, by a tri-factorial experiment, such as: A = crop technology , with graduations:  a 1 = N 0 P 60 , bacterized, a 2 = N 40 P 60 , bacterized; B = Irrigation regime , with graduations: b 1 =  dry land,  b 2 = irrigated 50% AMI (active moisture interval), on 0-80 cm, with m=800 m 3 /ha, by overhead irrigation, b 3 = irrigated 50% AMI, on 0-40 cm, with 1 / 2 m=400 m 3 /ha, by overhead irrigation, b 4 = irrigated 50% AMI, on 0-80 cm, with m=400 m 3 /ha, by drip irrigation, b 5 = irrigated 50% AMI, on 0-40 cm, with 1 / 2 m=200 m 3 /ha, by drip irrigation; C = Cultivated genotype , with graduations:  c 1 = Românesc 99,  c 2 = Triumf, c 3 = Danubian. Within the technological variants utilized in soybean crop, a « high-tech » technology was chosen, un-utilized in Romania till now, namely drip (sprinkle) irrigation.By the researches performed under different irrigated areas of Romania, one can ascertain that there is a possibility to diminish the irrigation norm, by low limited water supply, with 15-30%.There were no similar researches in other areas of the country.The achieved results establish the level of water supply, as well as the most efficient irrigation method in soybean, based on principle “much more with much less”. The paper presents high originality, there are no similar papers, till present, in Mostistea Plain. It also presents a new approach of water supply diminution, as utilization of some new and performance watering methods.Having in view the high cost of the irrigation water, the diminution of irrigation norm, by utilizing new performance methods has direct impact on economical indicators.

limited water supplying; watering rate; irrigation norm; water consumption; drought

Presentation: oral