CONSERVING OF THE RESOURCES
Studies to establish evapotranspiration and biophysical ratios of raspberries grown in drip irrigation
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.