Summary:

Field experiments were done in 2011-2012 in ES Lipnik near Stargard Szczeciński on the sandy soil (good rye complex) and small retencion of usefulness water. The experiment was designe by randomized block method in 4 replications. Among the trees was the lawn but in the rows the selective herbicide was used. The aim of the studies was to determine the effect of under crown irrigation on the chemical composition of leafs plum cv. ‘Amers' and ‘Cacańska Rana'. The experimental design consisted control fields, without irrigation - O and irrigated fields - W. Supplemental irrigation was used when tensiometer have shown that water potential of soil dropped lower than -0,01 MPa. For irrigation the "Hadar" sprinkler were used (r = 2 m). Depending on rainfall the amount of irrigation from 11,8 to 14,0 m3 there used. Studies have shown similar reaction of both plum varieties to the applied water factor. The leaves taken from trees irrigated had tends to reduce the concentration of nitrogen and phosphorus. A similar reaction of both varieties was also found in the case of the concentration of potassium and calcium. In addition, the objects on which there was an increase of zinc content significantly decreased concentration of iron. This relationship is particularly marked in leaf varieties ‘Cacańska Rana'.