H. KIRCHEV and I. STOEVA
Dobroudja Agricultural Institute, BG-9520 General Toshevo, Bulgaria
KIRCHEV, H. and I. STOEVA, 2003. Effect of systematic mineral fertilization on yield and quality of wheat variety Pliska. Bulg. J. Agric. Sci., 9: 475–480
The study included data on samples from selected variants of a stationary field trial carried out at DAI – General Toshevo during the period 1996–1999. Variety Pliska was preferred during the later stage of the trial due to its mass distribution throughout the country and to its being a wheat combining high productivity and excellent bread making quality. The quality indices were determined according to the methods adopted for this purpose at the laboratory of DAI-General Toshevo. Against the background of systematic fertilization for 31 years, the independent and gradual use of nitrogen contributed to increasing yield and improving the parameters of the technological characteristics of variety Pliska. A maximum result from combined fertilization was registered in the variants N18P12 and N12P12K12. The grain from only these variants corresponded to the requirements of strong wheats. The use of lower doses from the N and P combinations did not have a significant and stable effect on quality.