The field experiment was carried out in years 2008-2010 on rendzina soil. The aim of the research was to determine the effect of the chemical protection level on the yield of two winter spelt cultivars – Schwabenkorn and Spelt I.N.Z. cultivated under different conditions of mineral fertilization. Chemical protection levels included: A) control, B) Mustang 306 SE, Stabilan 750 SL, C) Mustang 306 SE, Attribut 70 WG, Stabilan 750 SL, D) Mustang 306 SE, Attribut 70 WG, Alert 375 SC, Stabilan 750 SL. Mineral fertilization was as follows (in kg of pure component per hectare): lower level N – 60, P – 26.2, K – 83, and higher level N – 80, P – 34.9, K – 99.6. Significantly higher grain yields were obtained from Spelt I.N.Z. cultivar compared with Schwabenkorn cv. Application of higher rates of mineral fertilizers significantly increased the number of ears per 1 m² as well as the grain yield of spelt wheat but had no effect on the weight of 1000 grains, and the number and weight of grains per ear. Chemical protection of Schwabenkorn cultivar caused significantly higher grain yield, from 29.8 to 33.7%, compared with control without chemical protection.

5-14