OPTIMIZATION OF FRUIT SET ON THE BACKGROUND OF DRIP IRRIGATION
The study was to establish an influence of physiologically active substances on economic productivity of fruit plants. The method of thinning ovaries in apple cvs. ‘ <i>Golden Delicious</i>’ and ‘ <i>Fujik</i>’ in Plavnevaya subzone (Kuban zone of Horticulture; 5-6-year-old apple trees) for two years showed that ammonium thiosulfate can be used as an effective method of chemical thinning. When the limit of pre-irrigation moisture (from moisture rate) was 80 %, an optimal dose was 12 l/ha and its increase to 16 l/h reduced the total number of fruits.