{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:59:02Z","timestamp":1782417542820,"version":"3.54.5"},"reference-count":12,"publisher":"STEF92 Technology","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,11,15]]},"abstract":"<jats:p>The last decade has been characterized by an increased frequency of climatic anomalies and their amplitude. These anomalies affect the productivity of crops and orchards, which is directly dependent on agro-meteorological conditions. The registered tendencies to change the hydrothermal conditions in the different regions of the country sometimes are a risk factor for their productivity, especially in the initial phenological stages of the development of the fruit trees. Bud dormancy on the fruit trees from the temperate zones is a phase of development that occurs annually and enables trees to survive cold winters. To estimate the chill requirements of orchards, besides temperature data, three chronological dates must be defined: the chill accumulation start date, the deep dormancy breaking date, and the date of eco dormancy end. \nThis study aims to assess the thermal conditions in the initial stages of development of some stone fruit plants grown in Bulgaria. There were analyzed the conditions during the deep dormancy in the orchards and the permanent transition of the average daily temperature above 5\ufffdC. Chilling requirements for breaking dormancy were studied for some peach, cherry, and apricot cultivars, located in the regions for industrial producing of these plants. The Utah chilling unit model was used to measure the accumulation of chilling requirements.<\/jats:p>","DOI":"10.5593\/sgem2022\/4.1\/s19.45","type":"proceedings-article","created":{"date-parts":[[2023,2,14]],"date-time":"2023-02-14T12:50:43Z","timestamp":1676379043000},"page":"349-356","source":"Crossref","is-referenced-by-count":1,"title":["PECULIARITIES IN THE INITIAL STAGES OF DEVELOPMENT FOR SOME FRUIT TREES, DEPENDING ON THE TEMPERATURE CONDITIONS"],"prefix":"10.5593","volume":"22","author":[{"given":"Petya","family":"Malasheva","sequence":"first","affiliation":[{"name":"National Institute of Meteorology and Hydrology at Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentin","family":"Kazandjiev","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology at Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Veska","family":"Georgieva","sequence":"additional","affiliation":[{"name":"National Institute of Meteorology and Hydrology at Bulgarian Academy of Sciences","place":["Bulgaria"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"3602","reference":[{"key":"ref=1","doi-asserted-by":"crossref","unstructured":"[1] Alonso, J.M, Anson, J.M, Espiau, M.T., Determination of endodormancy break in almond flower buds by a correlation model using the average temperature of different day intervals and its application to the estimation of chill and heat requirements and blooming date, J. Amer. Soc. Hort. Sci., Spain, vol. 130, pp. 308\ufffd318, 2005.","DOI":"10.21273\/JASHS.130.3.308"},{"key":"ref=2","doi-asserted-by":"crossref","unstructured":"[2] Barros, P.M., Goncalves, N., Saibo, N.J.M., Oliveira, M.M., Complete Cold acclimation and floral development in almond bud break: insights into the regulatory pathways, J. Exp. Bot. 63, Argentina, vol. 63, pp 4585-4596, 2012.","DOI":"10.1093\/jxb\/ers144"},{"key":"ref=3","doi-asserted-by":"crossref","unstructured":"[3] Bassi, D., Barrolini, S., Viti, R., Recent advances on environmental and physiological challenges in apricot growing. Acta Horticulturae, vol. 717, 23-31, 2006.","DOI":"10.17660\/ActaHortic.2006.717.1"},{"key":"ref=4","doi-asserted-by":"crossref","unstructured":"[4] Freeman, M.W., Martin G.C., Peach floral bud break and abscisic acid content as affected by mist, light and temperature during rest, J. Amer. Soc. Hort. 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A, Seeley, S.D., Walker, D.R A model for estimating the completion of rest for \ufffdRedhaven\ufffd and \ufffdElberta\ufffd peach trees \ufffd, HortScience, vol. 9, pp. 3319-332, 1974.","DOI":"10.21273\/HORTSCI.9.4.331"},{"key":"ref=9","doi-asserted-by":"crossref","unstructured":"[9] Ruiz, D., Campony, J. A., Egea, J., 2007. Chilling heat requirement of apricot cultivar for flowering. Environmental and Experimental Botany, vol.61, pp. 254-263, 2007.","DOI":"10.1016\/j.envexpbot.2007.06.008"},{"key":"ref=10","doi-asserted-by":"crossref","unstructured":"[10] Saure M.C., Dormancy release in deciduous fruit trees, Horticultural Reviews,7, pp. 239-300, 2005.","DOI":"10.1002\/9781118060735.ch6"},{"key":"ref=11","unstructured":"[11] Stanev, L., Sabev., S., Climate districts and regions in Bulgaria, Works of Institute of Meteorology and Hydrology, Bulgaria, vol.5, pp. 99-164, 1959."},{"key":"ref=12","doi-asserted-by":"crossref","unstructured":"[12] Valentini, N., Spanna, F., Lovisetto, M. 2004. Chilling and Heat Requirement in Apricot and Peach Varieties, Acta Horticulturae, vol. 636, pp.199 \ufffd 203, 2004.","DOI":"10.17660\/ActaHortic.2004.636.24"}],"event":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference 2022","theme":"Earth and Planetary Sciences","location":"Albena, BG","acronym":"SGEM2022","number":"22","sponsor":["SGEM WORLD SCIENCE (SWS) Scholarly Society, Austria"],"start":{"date-parts":[[2022,7,4]]},"end":{"date-parts":[[2022,7,10]]}},"container-title":["SGEM International Multidisciplinary Scientific GeoConference\ufffd EXPO Proceedings","22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies"],"original-title":[],"deposited":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:25:50Z","timestamp":1782415550000},"score":1,"resource":{"primary":{"URL":"https:\/\/epslibrary.at\/items\/f5f95b02-468e-4254-8c00-a1c0c038a509\/peculiarities-in-the-initial-stages-of-development-for-some-fruit-trees-depending-on-the-t"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,11,15]]},"references-count":12,"URL":"https:\/\/doi.org\/10.5593\/sgem2022\/4.1\/s19.45","relation":{},"ISSN":["1314-2704"],"issn-type":[{"value":"1314-2704","type":"print"}],"subject":[],"published":{"date-parts":[[2022,11,15]]}}}