Veliko Tarnovo, 15 Feb (ONA)--- An early notification system for flowering trees and pollen release will become operational in the cities of Veliko Tarnovo, Sofia and Plovdiv (Southern Bulgaria) in spring 2022, said agronomist Roman Rachkov, Head of the non-governmental Bulgarian Association for Biological Plant Protection (BABPP).

The project aims to help both those who have pollen allergies and all interested in natural processes such as fruit-growers, beekeepers, farmers, among others. Its purpose is to notify people when trees are flowering so that they take measures about it, Rachkov said.

The early notification system is based on the analysis of the sums of the effective temperatures in the growth phases of each tree. Three international meteorological stations provide information on the temperatures. Based on averaged data, a coefficient is calculated and it determines at what stage of development the tree/plant species is, Rachkov explained.

---Ends/Hilal/AH