INFLUENCE OF IBA AND NAA (0.8%) + (IBA 0.5%) PHYTOREGULATORS TO THE RISOGENESISOF THE MATURE LEMON TREE-SHOOTS (Citrus limon (L.) Burm. and Citrus meyearii Y. Tan.)

This paper presents results of investigations on the influence of exogenous phytohormonal substances of indol-3-butric acid (IBA) and alfa-naphtyl acetic acid in combination with IBA (NAA+IBA) on the percentage of rooting of the mature lemon tree-shoots of the two observed varieties, Meyer and Mjesečar. The average value of tree-shoots rooting upon application of IBA phytohormone varied from 25.00% with the Mjesečar variety (IBA-1000 ppm) to 85.25% with the Meyer variety (IBA-3000 ppm). The average value of the lemon tree-shoots rooting with the two observed varieties under IBA concentrations amounted to 54.83%. The average value of the tree-shoots rooting of the investigated lemon varieties that were treated with the phytohormone NAA (0.8%) + (0.5%) IBA amounted to 51.88%. The best average value of the rooted tree-shoots of 78.75% was recorded with the Meyer variety, whilst the least rooting of 25.00% was with the Mjesečar variety. The variance analysis and the LSD test established differences between investigated varieties, whereby the rooting success depends on exogenous treatment of tree-shoots with different types and concentrations of phytohormones.