engleski

Genotypic differences for nitrogen use efficiency in winter wheat (Triticum aestivum L.)

The objective of this study was to assess differences in nitrogen (N) use among eight wheat genotypes at three N levels of fertilisation. A factorial experiment including eight winter wheat genotypes and three levels of N (added as ammonium nitrate) was conducted in north-western Croatia during the 2004, 2005, and 2006 growing seasons on a silt loam soil. In each year a split-plot design with three replications was used, with N treatments as main plots and genotypes as subplots. Control plots received 0 kg N ha-1 (N0), while fertilised plots were treated with 50 kg N ha-1 at tillering (N50) or 100 kg N ha-1 (N100 ), one-half at tillering and one-half at the stem elongation (50% of the plants reached 1 cm spike length stage). Our results showed that genetic variability for N use efficiency exists in high-yielding winter wheat genotypes even at the lowest N level (N0). Genotypes Renan and Monika reached their maximal yield in the highest N level (N100), while line ZgM1 (also high yielding) reached maximal yield at the lowest N level (N0) without significant increase of yield with additional N inputs. Breeding line ZgM1 is therefore selected as genotype with high nitrogen use efficiency and will be used as the parent in the future crosses.

wheat; nitrogen use; yield

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