This paper presents the two year results of an investigation dealing with productivity, as well as genotypic specificity of nitrogen accumulation, of twenty recently developed Serbian winter wheat cultivars, on the acid soil typed as eutric vertisol. Soil pH value in water of the cultivated layer was between 5.41 and 5.83, and in KCl it was between 4.15 and 4.37. Titration acidity amounted 17.89 ccm. The following traits were studied: nitrogen accumulation in flowering, nitrogen accumulation yield, nitrogen accumulation in grain and straw, as well as the total nitrogen accumulation. There were obvious differences among cultivars regarding amount of accumulated nitrogen by flowering stage. In the first year of investigation this parameter varied from 25.70 mg in the cultivar Prima to 34.20 mg per plant in Kremna. Much lower values were observed in the second year, from 14.53 mg in the cultivar NS Rana 5 to 22.37 mg in Milica. The lowest average nitrogen accumulation yield during reproduction period amounted 3.23 mg in the cultivar Pobeda, while the lowest one was 11.78 mg in the cultivar Tiha. During the first year, the lowest value of  nitrogen accumulation in straw was shown by the cultivar Gruža (5.4 mg), and the highest one by Nevesinjka (13 mg per plant). This parameter in the second year ranged from 6.0 mg in the cultivar Tera to 12.0 mg in Renesansa. During the first year the lowest nitrogen accumulation in grain was observed in the cultivar Toplica (26.3 mg), and the highest one in Gruža (42.0 mg). Those values in the second year of the study ranged from 9.8 mg (Tera) to 16.0 mg (Tiha). The lowest total nitrogen accumulation was reached by the cultivar Prima (26.45 mg), and the greatest one by Tiha (37.00 mg).

winter wheat; nitrogen; soil; acidity

Presentation: oral