Prove preliminari sulla tolleranza alla clorosi calcarea di nuovi portinnesti ibridi pesco x mandorlo

Lime-induced chlorosis is a limiting factor of peach cultivation when peach seedling rootstocks are utilized. At present the problem seems to be solved with the most used rootstock by fruit-growers, the hybrid ‘GF 677’, joining good agronomic and quality characteristics, but inducing high vigour. Consequently the selection of other hybrid rootstocks seems essential, as alternative to ‘GF 677’, suitable for medium-high density planting and tolerant to calcareous soil. The aim of this research was to evaluate the tolerance to lime induced chlorosis by hydroponic culture of three clonal hybrid rootstocks, ‘Polluce’ (I.S. 5/8), ‘Castore’( I.S. 5/19) and I.S. 5/29, in comparison to ‘GF 677’. During a month of culture in nutrient solution (Hoagland n°1) supplemented with 0.0 and 10.0 mM of sodium bicarbonate, vegetative and physiological responses were detected. The NaHCO3 treatment reduced absolute and ponderate weight increment and total chlorophyll in every clones, but the most vigorou...