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

To establish the totals and average daily evapotranspiration of raspberry under the soil and climate conditions in the village of Chelopechene, near Sofia city research was conducted with drip irrigation of plantations with variety “Lyulin” adopting varying irrigation schedules – from fully meeting the daily crop water requirements to reduced depths with 20% and 40%.
The meteorological conditions during the study period have been influenced by the totals and average daily On average, during the research period the magnitude of the total evapotranspiration for the vegetation period of the raspberry is 482 mm, with the highest values reaching 592 mm in the dry 2000.
For the needs of the practice and the design are calculated also the ten-day values of the biophysical coefficient Z and kb, which depend on the biological characteristics of the culture and the meteorological factors.

The technology of surface improvement of haying grounds and pastures with band subsowing of herbs and aeration processing of interband space is presented. Results of tests of a model sample of the combined unit for improvement of haying grounds and pastures are given.

The evapotranspiration of Gergana long-fruit cucumbers was established in four years of field experimentation with drip irrigation, grown in greenhouse conditions on chromic luvisol soil in the Sofia region. Different irrigation regimes have been tested – from full satisfaction of the daily needs of the culture from water to irrigation with 20% and 40% reduced water application rates. The total evapotranspiration values for the study period were determined.
For the needs of practice and design, the ten-day values of the biophysical coefficient Z are calculated, which depends on the biological characteristics of the crop and the weather factors. On the basis of the established relationship between evapotranspiration and evaporation, the values of the coefficient of crop in unheated plastic greenhouses are calculated as the average for the cucumber vegetation curve Ki = 1.46.