International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In order to establish the aggregate and average daily values of raspberry evapotranspiration in an experimental site in the village of Chelopechene – Sofia, drip irrigation studies were carried out on a replanting variety "Liulin" under different irrigation regimes – from full satisfaction of the daily needs of the culture from water to irrigation with 20% and 40% irrigation norms. The meteorological conditions during the study period showed an influence on the sum of the sum and day-to-day values of the culture evapotranspiration.

On average, during the research period, the total evapotranspiration rate for the raspberry vegetation period is 4730 m3 / ha, with the main part being formed by the irrigation rate – 60% and by rainfall – 40%

For the needs of practice and design, the ten-day values of the biophysical coefficients Z and Kp were calculated over a five-year period.

A Polish experience with 10 hybrids of sunflower field was made on the Chelopechene Field, Sofia, on cinnamon forest soil. Sunflower hybrids are grown under non-irrigating conditions and under irrigation conditions with drip irrigation and microwaving.

The meteorological conditions during the study period determined the number of irrigations and the size of the irrigation and irrigation norms of the culture.

It has been found that the yields obtained under irrigation conditions are higher than 13 to 46%, with drip irrigation giving better results than sprinkling.

The Maritsa, San Luka and A58xC23 hybrids have been shown to be suitable for growing in non-irrigated conditions, while the hybrids "Vokil", "Michaela" and "Maritsa" hybrids are irrigated.

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.