he influence of some macronutrients, especially NH4NO3 and KNO3, on root development of microcuttings from 3 apple scion cultivars is discussed. A reduction of the level of NH4NO3 in the medium from full strength to 1/4 strength significantly increased the percentage rooting of Gala and Royal Gala, but not Jonagold. Further reduction of NH4NO3 level from 1/4 strength to zero significantly reduced the percentage of rooting in Gala but not Royal Gala. Jonagold rooted best at zero concentration NH4NO3. Without NH4NO3, rooting percentages were as high as 100% for all 3 cultivars when KNO3 was provided at full strength. The results show that adventitious roots can be induced on apple scion cultivars by media manipulation.
The effect of some macronutrients on adventitious root development on scion apple cultivars in vitro. Available from: https://www.researchgate.net/publication/227013505_The_effect_of_some_macronutrients_on_adventitious_root_development_on_scion_apple_cultivars_in_vitro [accessed Apr 2, 2015].