Rooting of blueberry hardwood cuttings as affected by irrigation water pH and IBA
The aim of this study was to investigate the effect of cultivar, indolebutyric acid (IBA) and pH of irrigation water on rooting of hardwood cuttings of blueberry. The experimental design was a split-plot with randomized blocks. The 16 treatments tested originated from the combination of the levels of three factors: cultivar ('Delite' and 'Briteblue'), IBA (with and without) and pH of irrigation water (4.5, 5.5, 6.0 and 6.9 as control). The pH factor was assigned to the main plots and the combination of IBA and cultivar levels to the split plots. Each split plot consisted of 18 cuttings. Cuttings were made using segments of main shoots with four nodes. After 170 days, assessments were made of the percentage of cutting survival, rooted and with callus formation; number of shoots, number of roots and length of the longest root. The polynomial regression showed that the percentage of cutting survival is enhanced as the pH increases up to 5.6, but decreases after that. The cultivar 'Briteblue' surpassed 'Delite' in the percentage of survival, cuttings rooted, with callus formation and number roots per cutting. In conclusion, the acidification of the irrigation water increases the percentage of survival of blueberry hardwood cuttings.
Fischer, D.L.O., Fernandes, G.W., Borges, E.A., Piana, C.F.B. and Pasa, M.S. (2016). Rooting of blueberry hardwood cuttings as affected by irrigation water pH and IBA. Acta Hortic. 1130, 431-436
Vaccinium ashei, indolebutyric acid (IBA), propagation, clone, seedling quality, nursery