A. Stoyanova, M. Georgiev, L. Plescuta
Abstract. Experience was conducted during 2004-2006 in southern Bulgaria, the soil type Vertisol. Has studied the performance of maize grain in a water deficit. A shortage of moisture created by a spatial deficit. Irrigation is supplied in one or two grooves, with the repeal of irrigations. The effect of irrigation is highest in the optimal option waterings (30,6%). Upon submission of irrigation water EOF 100% and 50%, respectively, the effect is 25,9% and 17,4%. The decline in yields in furrow irrigation EOF 50% reduction in irrigation rate is within 6,7%. In the present conditions of water deficit irrigation in the furrow is recommended to apply on soils with good capillary properties. Irrigation in EOTF reduced yields by 13,9% compared to the optimal option. The results are significantly lower than those of the optimal option, but in terms of lack of sufficient water for irrigation may be given this type of irrigation-in two furrows. The coefficient of efficiency of irrigation (K) water is highest in furrow irrigation EOF 50% and options without the watering (0,76-1,04).