Summary:

Field studies conducted in the years 2003 - 2005 in the Agricultural
Experimental Station in Lipnik near Stargard, on sandy soil. The aim of this study was to determine the effect of irrigation and fertilization crown on the content of total chlorophyll and carotenoids in leaves of cherry, peach and plum trees. Irri-gation was applied in the form of crown, in which water was distributed by type sprinkler Hadar, where the soil water potential fell below -0.01 MPa. Nitrogen fertilizers applied in early spring, before moving the vegetation, while phosphorus and potassium in the autumn according to the agricultural. All experiments were randomized block design established in the system dependent (called a split-plot), in seven replications in the experiment with cherry, peach and five with four repli-cations in the experiment with the plums. All experiments were carried out on trees in the fourth year after planting, fall within the third year of fruiting. Trees were planted at spacing: cherry - 4 x 2 m, peach - 3.5 x 3 m, plum - 4.5 x 4 m. per hec-tare were 1,250 pieces of cherry trees, peach trees 952.4 pc and 555, 5 pieces of plum trees. Maintained grass between the trees, and rows of trees-herbicide fallow. Plant material for laboratory testing were collected in each year in three periods: during the growing season at fruit set (one term), collections (2 term), and a month after harvest (3 dates). Studies have shown that leaves of trees irrigated with all tested species of stone fruit trees had lower total chlorophyll content and carotenoids compared to leaves collected from trees are not irrigated. The leaves of the trees fertilized with dyes contained significantly more assimilation.