GENOTYPE SOIL AND YEAR EFFECTS ON YIELD AND NUTRITIONAL STATUS OF MAIZE

Nine maize (Zea mays L.) hybrids were grown under field conditions on two soils (eutric cambisol and eugley) for two growing seasons (2004 and 2005). Seven domestic maize hybrids (OsSK444, OsSK554, OsSK644 and OsSK713, Bc66-61 and Bc778) and two foreign (ZPSK633 and ZPSK778 - from Serbia) were used. The field trial was conducted in five replicates (gross of basic plot 56 m(2)). Grain yield in 2005 was 13% lower than in 2004 (8.28 and 9.53 t ha(-1), respectively). Yields on eutric cambisol were lower than on eugley (6.96 and 10.84 t ha(-1), respectively). Also, differences of yields among the hybrids were very significant. The hybrid Bc778 yielded 10.37 t ha(-1) or 32% more compared to the hybrids Bc592 and ZpSK704. Leaf-N was in 2005 11% higher than in 2004 (means 2.53% N and 2.81% N, respectively), while leaf-P (mean 0.28% P) and -K (mean 1.68% K) differences between two years were non-significant. Leaf-K under eugley conditions was 25% lower than on cambisol (means 1.44% K and 1.92% K, respectively). Differences in leaf composition among the maize hybrids (influences of genotype) were in the ranges from 2.59% N to 2.76% N, from 0.25% P to 0.30% P and from 1.62% K to 1.76% K. In general, low connection was between leaf nutritional status and yields probably because relative favorable soil fertility of both soil types, although the first-ranged hybrid regarding yield (Bc778) was in the group of the hybrids with the highest leaf-N, -P and -K. Also, two low-yielding hybrids (Bc592 and ZpSK704) characterized considerably lower leaf K.