<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Field experiments with 12 winter wheat cultivars, which differed in N grain concentration, were established with three variants of N fertilisation (N0 = 0 kg N/ha, N1 = 100 kg N/ha, N2 = 200 kg N/ha) in the vegetative years 2004/05 and 2005/06 in Piestany (Borovce). The aims of experiment were to find out the effect of N applied (Nf) and available N (Nfs) on differences in N uptake and N utilisation. From the primary data of traits, grain yield (GY kg/ha), biomass production (BP kg/ha), and N concentration in grain (Ng) and in straw (Ns), other characteristics (NUP, NUE, NUTE) for available and applied N (Nfs, Nf, respectively) were calculated. In available N, significant differences were seen among cultivars in all characteristics but in applied N differences in NUP and NUTE among cultivars were not significant. Genetic correlations among traits and characteristics were modified by N environment. Grain N concentration (Ng) was, at the low N rate, in a negative correlation with NUE (r = -0.683+) and in a strong negative correlation with NUTE (r = -0.956++). At a high N rate, these correlations had the same character, but were weaker and not significant (r = -0.560 and r = 0.570). Grain N concentration (Ng) was more determined by efficiency of N translocation than by quantity of N uptake. Selection on the higher NUPE and NUE will be limited by negative correlation between BP and N biomass concentration and by low genetic variability of all characteristics of N uptake and utilisation.</p></abstract>

Field experiments with 12 winter wheat cultivars, which differed in N grain concentration, were established with three variants of N fertilisation (N0 = 0 kg N/ha, N1 = 100 kg N/ha, N2 = 200 kg N/ha) in the vegetative years 2004/05 and 2005/06 in Piestany (Borovce). The aims of experiment were to find out the effect of N applied (Nf) and available N (Nfs) on differences in N uptake and N utilisation. From the primary data of traits, grain yield (GY kg/ha), biomass production (BP kg/ha), and N concentration in grain (Ng) and in straw (Ns), other characteristics (NUP, NUE, NUTE) for available and applied N (Nfs, Nf, respectively) were calculated. In available N, significant differences were seen among cultivars in all characteristics but in applied N differences in NUP and NUTE among cultivars were not significant. Genetic correlations among traits and characteristics were modified by N environment. Grain N concentration (Ng) was, at the low N rate, in a negative correlation with NUE (r = -0.683+) and in a strong negative correlation with NUTE (r = -0.956++). At a high N rate, these correlations had the same character, but were weaker and not significant (r = -0.560 and r = 0.570). Grain N concentration (Ng) was more determined by efficiency of N translocation than by quantity of N uptake. Selection on the higher NUPE and NUE will be limited by negative correlation between BP and N biomass concentration and by low genetic variability of all characteristics of N uptake and utilisation.

CHARACTERISTICS OF NITROGEN USE EFFICIENCY AND THEIR MUTUAL RELATIONSHIP IN WINTER WHEAT CULTIVARS

Plant Production Research Center Piešťany Research Institute of Plant Production Piešťany, 921 68 Piešťany, Bratislavská cesta 122, Slovak Republic

Agriculture (Pol'nohospodárstvo)

Field experiments with 12 winter wheat cultivars, which differed in N grain concentration, were established with three variants of N fertilisation (N0 = 0 kg...

CHARACTERISTICS OF NITROGEN USE EFFICIENCY AND THEIR MUTUAL RELATIONSHIP IN WINTER WHEAT CULTIVARS

Pubblicato online: 25 gen 2014

Pagine: 149 - 160

DOI: https://doi.org/10.2478/agri-2013-0013

Parole chiave
winter wheat, cultivar, nitrogen use efficiency, nitrogen uptake efficiency, nitrogen utilisation efficiency, available nitrogen

This content is open access.

CHARACTERISTICS OF NITROGEN USE EFFICIENCY AND THEIR MUTUAL RELATIONSHIP IN WINTER WHEAT CULTIVARS

Pubblicato online: 25 gen 2014

Pagine: 149 - 160

DOI: https://doi.org/10.2478/agri-2013-0013

Parole chiavewinter wheat, cultivar, nitrogen use efficiency, nitrogen uptake efficiency, nitrogen utilisation efficiency, available nitrogen

This content is open access.

Parole chiave
winter wheat, cultivar, nitrogen use efficiency, nitrogen uptake efficiency, nitrogen utilisation efficiency, available nitrogen