Comparative studies on some late ripening pear hybrids.

The breading of the pear cultivars is a basic activity in fruitgrowing research taking into account the great importance of this specie in nourishment, but witch has only 4,3% from the total fruit production in our country. Taking into account the necessity of the perpetual renewal and improvement of the pear cultivars, both for consumers and farmers, we proposed to study three late pear hybrids (H4-15/18, H5-12/15, H6-9/12) from the point of view of the trees vigour, their phonology, production capacity and fruit quality. The researches took place between 2006-2008, in a pear orchard set up in 1999, with trees of one year old, planted at 4/2 m distance (1250 trees/ha). The pear trees were grafted on the quince tree rootstock, with a small vigour of growing. Observations were made regarding the permanent structure of the late pear hybrids, the ramified and formation crop capacity, the phonology of floral organs, binding capacity of fruit, productive efficiency, the relationship between the leaf’ surface and growing level of the sprouts, fruit quality. The obtained results show the high productive potential of late pear hybrids studied, grown in Bucharest area, an zone which assures the development of physiological and biochemical process at a sustained level, giving a strong long life and a corresponding vegetation state to this species. From the three hybrids, a remarkable evolution has the hybrid H69/12, with a superior potential above the other two.