RESEARCHES REGARDING TH WATER CONSUMPTION OF THE SOY BEAN CROP IN IRRIGATION AND NO IRRIGATION CONDITIONS BETWEEN 2003-2004

Abstract

SUMMARY The researches took place at theapca Verde (Cluj-Napoca) experimental field, a regi on situated in the sub humid area of Transylvania. The plants water consumption was determined by the direct method of the water balance sheet of the soil. The idea of this method, is to d eterminate the soil humidity on the entire period of vegetation. In irrigation conditions, in 2003, during the veget ation period it was registered a total water consumption of 5324 m 3 /ha. The daily medium water consumption registered values between 15-40 m 3 /ha/day, with a maximum in July - 40 m 3 /ha/day. Plants total water consumption, recorded during the vegetation period in no irrigation conditions (2003), was 4164 m 3 /ha. The daily consume oscillated between 9-36 m 3 /ha/day. In July we noted the highest daily water consumption- 36 m 3 /ha/day. The plants total water consumption during the veget ation period of 2004, in no irrigation conditions was 4719 m 3 /ha. In July we registered the highest water consum ption: 1047 m 3 /ha. The daily medium consumption values oscillated between 31-34 m 3 /ha/day. In irrigation conditions, the total water consumpti on during the vegetation period was de 5317 m 3 /ha. The months with the highest level of water con sumption were July and August. The daily consumption values oscillated between 20-40 m 3 /ha/day. From all indirect methods used to determinate plant s water consumption, the Thornthwaite method proved to be the best for our c ountry conditions. Compared to the direct method of hydro-balance of the soil, using this met hod we can obtain, in general, different values: lower in the steppe and higher in the field forest area. In 2003, the plants daily water consumption recorded values between 15-50 m 3 /ha/day, with a maximum value in July: 50 m 3 /ha/day. The daily medium consumption oscillated in 2004 between 17-39 m 3 /ha/day. July was the month with the highest values (1210 m 3 /ha). Fallowing the plants water consumption during the v egetation period has a considerable importance to establish the watering doses and the moment to apply the watering.