Biochemical Composition of the Pear Fruit at FSBSI FARC of the North-East named after N. V. Rudnitskiy

Abstract

The pear tree is a relatively new crop for the North-East of the European part of Russia; therefore, the purpose of the work is to study biochemical composition of pear fruit in conditions of Kirov region. The objects of the research are 9 varieties of the pear tree of 2007 planting year: Chizhovskaya (a check variety), Kupava, Perun, Svarog, Karataevskaya, Naryadnaya Efimova (Dressy Efimova), Vidnaya (Prominent), Larinskaya, Povislaya. In conditions of the region the studied varieties of the pear accumulate on overage 9.32% of sugar, 2.73 mg% of ascorbic acid, 17.10% of dry matter and are noted for high titratable acidity – on average 0,96. The varieties Kupava, which combines high amount of sugars sum and dry matter, with excellent gustatory qualities and Povislaya, which is prominent for really high amount of dry matter and high sugar sum, were distinguished. The main stages with maximal quantity of strong interconnections between weather factors and indices of biochemical composition of the mostly varieties of fruit were differentiated, in particular: the sum of effective temperatures during the period from July to August, the sum of effective temperatures separately for July and separately for August and hydrothermal index for June.