INFLUENCE OF ECOLOGICAL FACTORS ON THE PRODUCTIVITY OF POTATO CULTIVAR-SAMPLES

The paper studies potato cultivar-samples in various environmental conditions of Tajikistan, differing in altitude above sea level, the amount of precipitation and the average monthly air temperature. Climatic parameters differ depending on the altitude above sea level, significantly affecting the productivity of potato plants. Productivity at an altitude of 550–2 550 m above sea level averages 280–570 g/plant, respectively. As the height increases from 2 700 to 3 600 m, the yield decreases from 500 to 310 g/plant. The most optimal condition for obtaining a high yield (up to 25–29 t/ha) is the altitude above 2 550–2 700 m, the amount of precipitation during vegetation is within 80–120 mm and the average monthly air temperature is between 18–20 оC. The correlation between productivity and height above sea level and between yield and precipitation during the potato growing season (r = 0.445) is weak.