IRRIGATION WATER PRODUCTIVITY FOR RASPBERRIES GROWN IN DRIP IRRIGATION CONDITIONS

To determine the irrigation water productivity for raspberries during their cultivation in the soil-meteorological conditions of the area of the village of Chelopechene - Sofia, studies have been carried out with drip irrigation of a plantation with the variety Lyulin. Various regimes have been studied - from full satisfaction of the daily needs of the culture to water, to irrigation with 20% and 40% reduction in irrigation regulations. The meteorological conditions during the study period determined the number of irrigations and the size of the irrigation and irrigation norms of the culture. On average, over the survey period, the highest yields were obtained with the watered with 100% irrigation norm option. The increase in yields resulting from the irrigation is about three times the non-irrigated option in surface drip irrigation. The highest irrigation water productivity of 4.3 kg of raspberries per cubic meter of water is obtained in variants irrigated with a 40% reduced irrigation rate.