Abstract
Periods of transition between phenological phases in different kiwi plant varieties: one of the most widely grown fruits today, kiwis are grown extensively in many subtropical and temperate nations. Kiwi farming has recently piqued the curiosity of many fruit producers and landowners in our nation. In order to study the morpho-biological traits of the growth and development of these fruit plant varieties in the soil and climate conditions of Uzbekistan and to scientifically support the possibilities of establishing industrial kiwi gardens on this basis, it is necessary to conduct special scientific research on this plant. In the article, the duration of phenological phases of Kiwi (Actinidia deliciosa (A.Chev.)) varieties Hayward, Monty, Bruno, and pollinator Matua were observed in the climatic conditions of Tashkent region at the Extension center of Tashkent State Agrarian University in Uzbekistan. The sum of active temperatures above 10 °C was calculated for the growth phases of kiwifruit cultivars.