Regional distribution of the latest ZP maize hybrids generation by the heat summation method

Abstract

Five-year studies on the duration of the growing season of the VI generation of ZP maize hybrids were carried out on slightly calcareous chernozem at Zemun Polje in the 2009-2013 period. The following hybrids were observed: ZP 427 (FAO 400), ZP 555 and ZP 560 (FAO 500) as well as ZP 600, ZP 606 and ZP 666 (FAO 600) in the optimum sowing densities of 55- 65,000 plants x ha-1. The average duration of the growing season ranged from 121 days (ZP 427 - medium early maturity hybrid) over 125-128 days (ZP 555 and ZP 560 - medium maturity hybrids) to 130-134 days (ZP 600, ZP 606 and ZP 666 medium late maturity hybrids). The necessary heat unity sum for the medium early maturity hybrid, medium maturity hybrids and medium late maturity hybrids amounted to 1,315 oC, 1,315-1,363oC and to 1,425-1,461oC, respectively. This is a good indicator for the appropriate agroecological regional distribution of ZP hybrids.

Obavljena su istraživanja dužine vegetacije šest hibrida kukuruza najnovije (VI) generacije ZP hibrida u agroekološkim uslovima Zemunskog polja u petogodišnjem periodu (2009-2013). Ispitivani su sledeći hibridi: ZP 427 (srednje rani), ZP 555 i ZP 560 (srednje stasni) i ZP 600, ZP 606 i ZP 666 (srednje kasni) FAO grupe zrenja 400,500 i 600. Dužina vegetacije bila je od 121 dan (ZP 427), 125-128 dana (ZP 555 i ZP 560) do 130-134 dana (ZP 600, ZP 666 i ZP 606). Ukupna suma toplotnih jedinica (efektivnih temperatura) bila je od 1.315o C do 1.461o C i to je polazna osnova za savremenu agroekološku rejonizaciju gajenja ZP hibrida FAO 400-600, tj. do 400-600 m n.v.