StatusThe thesis was presented on the 16 September, 2004
Approved by NCAA on the 23 December, 2004
Abstract– 0.16 Mb / in romanian
In the dissertation were reflected results of investigation of biological and production peculiarities for growing of 64 new introduced and 84 created in the institute pear hybrids (breeder X.Dushutina), grafted to pear rootstock. 74 compatible with quince varieties and hybrids were studied the same to quince rootstock. Root arrangement, indexes of tree vigor, terms of beginning principle vegetation phase and their duration, production, fruit quality, storage period, resistance to principle pear diseases and pests, economic valuation of pear varieties production were studied. It was established that varieties and hybrids essentially differ between themselves with tree vigor that gave us possibility to select with tree vigor reduced and re-calculation of production for unit of crown volume, unit of square of crown projection and unit of square of trunk section gave us possibility to select a group of productive varieties and hybrids with vigor reduced for intensive plantation.. Terms of beginning of the principle vegetation phases of pear growth are connected with temperature conditions. It was established appearance of fire blight
Biochemical analysis of promising varieties and hybrids were offered. Good varieties and hybrids for long storage were recommended. Economical valuation of pear varieties production was given.
As a result of investigation 6 promising varieties and hybrids has been selected
according to complex of economical valuable indices, from them have been passed to
State testing. 2 hybrids with good compatibility to quince rootstock have been
selected. Some varieties and hybrids have been recommended as potential donors of
range of value characteristics.