Influence of zinc application on grain yield and leaf area of different maize genotypes

Maize is grown in different regions, in the era of climate change, research aimed at achieving stable grain yields is very important. The aim of this study was to determine the influence of zinc application on yield and leaf mass area of three maize genotypes. The experimental experiment was set up in the region of Mačva (ΨN 44 ° 36 ′ 31.8 ″, λE 19 ° 47′4.2 ″). For plant nutrition, the following is provided: 160 kg ha-1 nitrogen (30 kg ha-1 in basic cultivation, 90 kg ha-1 in pre-sowing and 40 kg ha-1 in top-dressing). The research was conducted in the period 2017-2018. years (factor A). Sowing was done in the first decade of April with three hybrids ZP 724, ZP 548, ZP 687 (factor B). In addition to control, zinc treatments were applied: Zn1 ZnSO4 25 kg ha-1 was introduced into the soil before sowing; Zn2 seed treatment + foliar treatment. Before sowing, 63 grains were immersed for 24 h in aqueous ZnSO4 solution (0.129 g and supplemented with 200 ml of water). Foliar treatments in the phenophase of 5-7 leaves with 2 l ha-1 liquid fertilizer (7% Zn)