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