G. Ören1*, H. Çelik2 1Department of Soil Science and Plant Nutrition, Institute of Natural Sciences, Bursa Uludag University, Bursa, Turkey 2Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Bursa Uludag University, Bursa, Turkey (Manuscript received 14 August

M. Drumeva*, P. Yankov Department of Plant Production, Faculty of Shipbuilding, Technical University Varna, 1 Studentska, 9010 Varna, Bulgaria (Manuscript received 6 March 2017; accepted for publication 3 July 2017) Abstract. For accelerated development of fertility restorer lines wit

G. Georgiev* Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria (Manuscript received 1 July 2016; accepted for publication 26 August 2016) Abstract. A male sterile two-linear sunflower hybrid was developed at Dobrudzha Agricultural Institute – General Toshevo using the m

M. Drumeva*, P. Yankov Department of Plant Production, Faculty of Marine Sciences and Ecology, Technical University Varna, 1 Studentska, 9010 Varna, Bulgaria Abstract. When applying gamma-ionizing radiation for induction of parthenogenetic doubled haploidy, the female genotype exercis

G. Milev* Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria Abstract. A field experiment was carried out with sunflower (Helianhtus annuss L.) hybrid San Luka during 2011 – 2013 in the trial field of Dobrudzha Agricultural Institute under conditions of slightly leached

G. Georgiev*, V. Encheva, N. Nenova, Y. Encheva, D. Valkova, P. Peevska, G. Georgiev Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria Abstract. The new Bulgarian sunflower hybrid Vokil was developed at Dobrudzha Agricultural Institute (DAI), General Toshevo, Bulgaria b

A. Matev, R. Petrova Abstract. The aim of this work is to establish parameters of relationship “yield-irrigation depth” for sunflower (grown in the region of Plovdiv), using different equations, as follows: y = ax2 + bx + c; y = y + 2 (1–y ) x – (1–y )x2; Y = 1 – (1 –Y )(1 – x)n. The

M. Drumeva, P. Yankov, N. Nenova, P. Shindrova Abstract. The investigation was carried out at the Laboratory facilities of Dobrudzha Agricultural Institute (DAI), General Toshevo, Bulgaria during 2010 – 2012, and involved 15 doubled haploid fertility restorer sunflower lines (R-lines)

R. Petrova, A. Matev, H. Kirchev, A. Sevov Abstract. The aim of the conducted experiment is to determine the effect of irrigation canceling during the different phases of sunflower vegetation, and single irrigation done at a particular growth stage. The field experiment was conducted

A. Matev, R. Petrova, H. Kirchev Abstract. The aim of the study is to analyze the influence of irrigation regime on evapotranspiration (ET) of sunflower, in terms of total and average daily values, its effectiveness in terms of yield, and the peculiarities of its formation. The field