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Bulgarian Journal of Agricultural Science (BJAS)® is a peer-reviewed, open access, online and print journal, issued bimonthly. It has been published in English since 1995. It publishes original research papers, review articles and brief communications from all areas of agricultural science including agricultural economics, agroecology, agrochemisty and soil science, crop science, plant protection, animal science, veterinary medicine, fisheries and aquaculture, agricultural engineering, food technologies and other related areas.

ISSN 1310-0351 - print
ISSN 2534-983X - online

Publisher: Agricultural Academy of Bulgaria
Editor-in-Chief: Prof. Dr. Martin Banov
Executive editor: Snezhana Besarabova
E-mail: bjas_sb@abv.bg
Web: www.agrojournal.org

Bulgarian Journal of Agricultural Science
125, Tzarigradsko shosse Blvd., Block 1
1113 Sofia, Bulgaria

Print preparation: Ivo Nikov
Printing:BPS Ltd

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Note to contributors

Volume 27 Number 5 October 2021


Economic performance of agricultural enterprises in Bulgaria

Todor Yalamov, Albena Vutsova and Martina Arabadjieva

The improvement of dryland farming sustainable management in food-insecure areas in East Nusa Tenggara, Indonesia

Erlyna Wida Riptanti, Masyhuri Masyhuri, Irham Irham and Any Suryantini


Study on some economic indicators, characterizing the production efficiency of raising Ile de France sheep. I. Comparative analysis of economic results in different production units

Stanimira Slavova and Evgeniya Achkakanova

Production, employment and productivity of agricultural sector in the European Union

Silvia Megyesiova

Bulgarian agriculture in the focus of representative statistical surveys

Plamena Yovchevska

Does Covid-19 have effects on the Indonesian horticultural subsector?

Agus Dwi Nugroho


Unmanned drone multispectral imaging for assessment of wheat and oilseed rape habitus

Marina Stoyanova, Alexander Kandilarov, Vesselin Koutev, Olga Nitcheva and Polya Dobreva

Environmental responsibility in sustainable agriculture

Eva Pechociakova Svitacova


Effect of blue green algae extract on three different curly parsley varieties under Sinai conditions

Wafaa Hamed Abd El-Aleem, Emad Saleh Hamed and Wael Ismail Mohamed Toaima

Influence of IMMUNOSTART HERB feeding on the bee colonies development

Rositsa Shumkova and Ralitsa Balkanska


Modern notions about the pollen sterility in the vine and methods for overcoming it

Stefan Topale and Venelin Roychev

Reaction of Bulgarian varieties of perennial ryegrass (Lolium perenne L.) to glyphosate

Plamen A. Marinov-Serafimov, Irena A. Golubinova and Aneliya I. Katova

Productivity of Kabuli chickpeas depending on the weather conditions of the year, varieties and methods of sowing in Ukraine

Tetiana Kachanova, Tetiana Manushkina, Mykola Samoilenko, Olena Petrova and Nadiia Koloyanidi


Yield evaluation of guar genotypes (Cyamopsis tetragonoloba L. Taub.) selected for high-density planting and mechanical harvesting

Carlos M. G. Reis, Celestino M. Almeida, Luis F. V. Peças and José P. F. Almeida

Selection of tropical wheat lines based on classical and modern parameters of adaptability and stability

Caique Machado e Silva, Henrique Caletti Mezzomo, Cleiton Renato Casagrande, Gabriel Wolter Lima, Tiago Olivoto and Maicon Nardino


Wild annual Helianthus species as sources for resistance to some foliar pathogens on sunflower

Daniela Valkova and Valentina Encheva


Effect of different fertilizer rates on some quantitative parameters of maize in pot exper­iment with alluvial-meadow soil

Zdravka Petkova, Lyuba Nenova, Tsetska Simeonova, Maya Benkova, Martin Nenov, Ilianа Gerassimova, Ani Katsarova, Irena Atanassova and Milena Harizanova

The relationship between the content of heavy metals Pb and Zn in some components of the environment, fishes as food and human health

Elica Valkova, Vasil Atanasov, Tatyana Vlaykova, Tanya Tacheva, Yanitsa Zhelyazkova, Dimo Dimov and Kristian Yakimov

The relationship between the content of heavy metals Cd and Cu in some components of the environment, fish as food and human health

Elica Valkova, Vasil Atanasov, Tatyana Vlaykova, Tanya Tacheva, Yanitsa Zhelyazkova, Dimo Dimov and Kristian Yakimov


Turkey’s animal selection and animal importation within the scopes of health and technical criteria

A. Ahmet Yücer and Ömer Altıntaş

In­sect-based diets effects on turkey meat quality

Mitko Lalev, Nadia Mincheva, Magdalena Oblakova, Pavlina Hristakieva, Ivelina Ivanova, Atanas Atanassov and Adelina Petrova

Endocrine responses to shearing stress in pregnant Ile de France ewes with low and high basal hematocrit levels

Penka Moneva, Marina Tsaneva, Ivan Yanchev, Nikola Metodiev and Dimitar Gudev

Synchronization of the ovulation (OvSynch) in the beef cattle

Tania Todorova, Tsvetelina Todorova and Iancho Todorov

Phenotypic and genetic characteristics of fecundity in sheep. A review

Tanya Ivanova, Radostina Stoikova-Grigorova, Milena Bozhilova-Sakova, Maya Ignatova, Ivona Dimitrova and Veselin Koutev


Effect of mixing speed and time on the homogeneity of multi-particle size sugarcane leaves product in horizontal paddle mixer for pelletized

Peeranat Ansuree, Somposh Sudajan, Chaiyan Junsiri and Kittipong Laloon