The aim of this study was to assess the impact of microsprinkler and nitrogen-potassium fertilization on photosynthetic activity and quality of two varieties of cherry crop.The study was conducted in 2008-2009 (in the tenth year after planting), the varieties of cherry trees 'Łutówka' and 'Kelleris'. The experiment was
a randomized block design in the system dependent (called split-plot) in seven iterations. Trees grown in the span of 4 x 2 mThe use of irrigation and nitrogen and potassium fertilization effect on physiological processes. Trees irrigated intensively assimilated carbon dioxide and water transpired. But had no effect on the concentration of CO2 in the stomatal apparatus. Irrigation has contributed to the reduction of nitrogen index and greening leaves on each tree crown height. The increase in fertilizer N and K increased the value of both indicators.Significantly more efficient photosynthetic apparatus of leaves found in the variety 'Kelleris'.Under the influence of irrigation increase in average fruit yield of the two varieties was 10.3%.Among the larger yielding varieties showed 'Kelleris', although the difference in yields was not large.The use of additional nitrogen-potassium in a dose of 160 kg ha-1 increased fruit yield, as compared to the control was 12.5%.No significant effect of experimental factors assessed by mass one handred cherries. Among the factors studied, the use of nitrogen and potassium in the total dose of 160 kg ha-1, increased in the fruits of nitrogen, phosphorus, potassium and zinc. Improving soil moisture with reduced nitrogen and iron concentration increased and the content of potassium, calcium, magnesium and zinc. Variety did not affect the chemical composition of the fruit.