Prinos ns hibrida kukuruza iz različitih perioda selekcije / Yields of ns maize hybrids from different breeding periods
2015
Stojaković, Milisav (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Jocković, Đorđe (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Bekavac, Goran (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Nastasić, Aleksandra (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Mitrović, Bojan (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Stanisavljević, Dušan (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija)) | Zorić, Miroslav (Institut za ratarstvo i povrtarstvo, Novi Sad (Srbija))
Within maize breeding program at the Institute of Field and Vegetable Crops Novi Sad, Serbia, there have been seven distinct breeding cycles spanning from the mid-1960s. Each cycle is characterised by introduction of new hybrids with higher genetic yield potential. Breeding cycles were defi ned based on the period of hybrid introduction into production and the growing areas. In this study we analysed grain yield and moisture percentage in grain of fi ve maize hybrids, namely NS 606, NS 640, NS 6010, NS 6030 and NS 6140, which are the representatives of the third, fourth, fi fth, sixth and seventh breeding cycles. Seed of hybrids which are representatives of the fi rst and second breeding cycles, namely NS 802 and NSSC 70, could not be produced because their parent inbred lines have lost their authenticity. According to the results of the combined ANOVA, signifi cant differences (P<0,001) in grain yield were found among hybrids representatives of various breeding cycles and various environments, while the interaction cycle/ environment was found to be insignifi cant. A linear increase of yield by 0.44 t ha-1 (expressed by coeffi cient of linear regression) was found between individual breeding cycles. Since one breeding cycle lasts for approximately 7 years, average grain yield increase in maize from the third to the seventh breeding cycle was found to be 63 kg ha-1 per year.
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