Simeon Krumov

Institute of Agriculture - Kyustendil, Bulgaria · Breeding, introduction and cultivars studies on crops

The response of some introduced sweet cherry cultivars and hybrids to abiotic stressors was studied. Resistance to low winter temperatures was monitored in laboratory conditions (2020-2021), and their sensitivity to drought in natural conditions (2018-2019). From the three levels of controlled freezing (-15ºС; -20ºС; -25ºС) it was found that the cu...

The influence of arbuscular mycorrhizal fungi in the EC fertilizer Dynocarb MYC on the growth of 16 newly introduced cherry cultivars for the Kyustendil region - Primulat, Early Lorry, Sweet Lorry, Lorry Bloom, Big Lorry, Giant Red, Firm Red, Giorgia, Folfer, Early Star, Simcoe, Canada Giant, Skeena, Katalin, Sweetheart, Ferrovia, Bigarreau Burlat...

A brief pomological description of the sweet cherry cultivars ‘Pobeda’, ‘Kyustendilska Chrustyalka’, ‘Cherna Konyavska’ and ‘Mizia’, created in the early periods of the selection activity at the Institute of Agriculture in Kyustendil (50s - 70s of the last century) was made. Due to their low spread in the past already these cultivars are threatened...

Sweet cherry (Prunus avium L.) is one of the most important stone fruit species in Bulgaria. The species is known to be susceptible to more than 30 viruses. Among them are the important prune dwarf virus (PDV), prunus necrotic ringspot virus (PNRSV) and apple mosaic virus (ApMV), ilarviruses. Testing for these viruses is required in the certificati...

A comparative study had been carried out on the drought resistance of the red wine variety Rubin, grafted on four different rootstocks.It was found that in the period 2017 – 2020 there had been a significant increase in the total temperature sum, as by this indicator the years 2019 and 2020 were characterized as the warmest, compared to the previou...

In the period 2017-2020 a comparative study was carried out to establish the influence of the training system on the drought resistance of red wine grape varieties of different genetic origin. It was found that the analysis of the weather factors during the study period permanently outlined the trend towards significant warming and drought in the r...

In the Kyustendil region as a result of many years of practical and scientific experience mahaleb (Prunus mahaleb L.) and wild cherry (Prunus avium L.) are approved as the main rootstocks of the sweet and sour cherry. The aim of the study was to index selected trees of the free-growing population of mahaleb forms and wild cherries in the Kyustendil...

It was performed comparative analysis of the agrobiological and economic potential of introduced for Kyustendil region seed (Misket plevenski, Dunav, Velika and Diana) and seedless (Kishimis moldovski, Kondarev 6 and Russalka 3) table grapevine cultivars. A comparative option is the early-grown cultivar-standard Super early Bolgar. The study was co...

The researches were conducted during the period 2016 - 2018 under field conditions in a collection vineyard at the Institute of Agriculture - Kyustendil. The object of the survey were the newly introduced from China table grapevine cultivars with interspecific origin - Kyoho, Shzn nong jin huanghou, Bixiang Wuhe, Wuhzhanxiang mi, as well as cultiva...

The reaction of wine grapevine cultivars grown in the region of Kyustendil to low winter temperatures in controlled (laboratory) conditions was studied. Тhe results for the three controlled freezing levels (-15,0ºС; -20,0ºС; -25,0ºС), show that the highest hardness to low winter temperatures have the cultivars with interspecific origin - Slava and...

Проведено е изследване и е установена степента на устойчивост към ниски зимни температури при лабораторни условия (хладлни камери) на характерни за района на град Плевен винени сортове лози. Резултатите потвърждават по-високата устойчивост на междувидовите сортове лози на ниски зимни температури в сравнение с европейските сортове от Vitis vinifera...

The reaction of selected sweet cherry cultivars and elites to low winter temperatures in controlled (laboratory) and natural conditions was studied in 2018 and 2019. Тhe results for the three controlled freezing levels (-15ºС; -20ºС; -25ºС), showed that Hartland, Blackgold and Whitegold cultivars have relatively highest resistance to low winter tem...

It was performed a research on the resistance of sweet cherry fruits to mechanical pressure and detachment force from their fruits stem for the cultivars ‘Merchant’, ‘Pobeda Кrimska’,‘Summit’, ‘Vanda’, ‘Stella’, ‘Sunburst’, ‘Rainier’,‘Bing’, ‘Mizia’, ‘Kozerska’, ‘Vasinika’, ‘Alexton’ and control cultivar ʻVanʼ. The survey was conducted during harve...

It was performed a comparative analysis of indicators characterizing the actual fertility and yield of newly introduced for the region of Kyustendil table grapevine cultivars – Misket russenski, Prista and Ryahovo. Super early Bolgar, the reference for the group of early ripening cultivars is accepted as a control variant. The research found that a...

Response of 16 new introduced sweet cherry cultivars and one hybrid from Poland and China to winter hardiness and late spring frost was evaluated, and their phytosanitary status was determined. The research was conducted in the experimental sweet cherry orchard planted in the spring of 2012 at the Institute of Agriculture – Kyustendil. The study on...

It was performed a brief pomological description of sweet cherry elites № 32/25 (Van x Stela), № 5750 (Kordia x self-pollination), № 3419 (4С–1821 х self-pollination), № 5752 (Kordia x self-pollination), № 1890 (Germersdorf x self-pollination) and № 6374 (Stella x Germersdorf), created at Institute of agriculture - Kyustendil. It was found that all...

SUMMARY It was performed a comparative studyon drought resistance of group of cultivars and clones of vines grown in soil and climatic conditions of Pleven region.It was found that during the study period there is a steady trend of change of major climatic indicators led to an increase in the total temperature sum during vegetation (°C), daily aver...

It was performed a comparative analysis of agrobiological and economic potential of newly introduced for the region of Kyustendil table grapevine cultivars - Misket russenski, Prista and Ryahovo. Super early Bolgar, the reference for the group of early ripening cultivars is accepted as a control variant. The performed comparative analysis in agrobi...

It was done relatively phenological research of table grapevine cultivars (Vitis viniferа L) introduced from IASS - "Obraztsov chiflik", Rousse – Misket russenski, Prista and Ryahovo. The research was conducted in experimental vine plantation at the Institute of Agriculture-Kyustendil over the period 2013-2015. It was found that no significant diff...