The experience of using iron hydroxide nanoparticles while reproducing Ribes nigrum L. by green shanks

The results of application of the propagation of black currant (Ribes nigrum L.) with green cuttings of solutions of indolyl-3-acetic acid and the same solution with the introduction of three modifications of biogenic iron hydroxide nanoparticles are presented. Colloidal nanoparticles of “pure” ferrihydrite (Feh) and ferrihydrite doped with aluminum (Feh_Al) and cobalt (Feh_Co) were tested. When processing cuttings with the solution of IAA + Feh_Co, the percentage of rooting was 100 %. The addition of Feh and ferrihydrite doped with aluminum (IAA + Feh_Al) to the stimulator resulted in the decrease in root formation index - 47 % and 73 %, respectively. The account of biometric parameters in the second year of the research at digging seedlings showed that average number of shoots for options using suspensions of nanoparticles was lower, or at the control level. Using Feh slightly increased average number of shoots - 3.4 pcs. When taking into account average shoot length, the increase of this indicator was noted in all experimental variants using biogenic ferrihydrite - 41...