N. Valkova, M. Koleva* Field Crops Institute, 6200 Chirpan, Agricultural Academy, Sofia, Bulgaria (Manuscript received 14 October 2021; accepted for publication 16 January 2022) Abstract. The norm of reaction in qualitative aspect was studied in 31 Bulgarian and foreign cotton cultiva

M. Koleva*, M. Radevska Field Crops Institute, 6200 Chirpan, Bulgaria (Manuscript received 14 August 2021; accepted for publication 26 October 2021) Abstract. Seeds of five Bulgarian cotton varieties, stored for one and two years, were subjected to five pre-sowing electromagnetic trea

V. Dimitrova, R. Dragov Field Crops Institute – Chirpan, 6200 Chirpan, Bulgaria (Manuscript received 7 June 2021; accepted for publication 2 August 2021) Abstract. Cotton breeding in Bulgaria is mainly aimed at improving the earliness, productivity and fiber quality of modern va

Barakova, St. Georgiev   Field Crops Institute, 6200, Chirpan, Bulgaria   (Manuscript received 25 June 2019; accepted for publication 15 August 2019)   Abstract. The trial was carried out during 2013-2015, with twelve cotton cultivars (Gossypium hirsutum L.). Influence of herbici

T. Barakova1*, G. Delchev2 1Field Crops Institute, 6200 Chirpan, Bulgaria 2Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 2 June 2017; accepted for publication 17 August 2017) Abstract. Weed control in the cu

T. Barakova1*, G. Delchev2 1Field Crops Institute, 6200 Chirpan, Bulgaria 2Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 16 May 2016; accepted for publication 26 May 2016) Abstract. An experiment was carried

I. Saldzhiev, A. Muhova Abstract. Field trial on cotton (Vega cultivar) was carried out during 2007–2011 on leached vertisols under irrigation regime of sprinkling – 75 % of the field moisture capacity (FMC) for the soil layer of 0 – 40 cm. The trial included the following variants: f

A. Stoilova, Hr. Meluca Abstract. The new cotton varieties Rumi and IPK Nelina were tested in 2005–2010. Rumi variety resulted from the crossing of the Bulgarian breeding line 268 (Garant X Progress) to the American variety Deltapine 20. The Progress variety was obtained after the int

Research studies on cotton potassium fertilization in the last years at the Cotton and Durum Wheat Research Institute – Chirpan, Bulgaria have been reviewed. The soil Eutric vertisols was well supplied with available potassium (31-43 mg/100 g soil). The effect of K application was not