DYNAMICS OF NITROGEN, PHOSPHORUS AND POTASSIUM CONTENT IN SWEET CHERRY LEAVES OF DIFFERENT CULTIVAR/ROOTSTOCK COMBINATIONS

摘要

The experimental work was carried out in an intensive sweet cherry plantation (3rd and 4th vegetation) in the period 2005 2006 on the territory of the Fruit-Growing Institute - Plovdiv. Subject of investigation was the content of N, P and K in the leaves of Bigarreau Burlat and Regina cultivars grafted on the seedling rootstocks Prunus mahaleb and Prunus avium, and on the vegetative rootstock Gisela 5. The results obtained showed that nitrogen was absorbed at equal rates by all the three rootstocks. Concerning the other two elements, the highest potassium content was established in Bigarreau Burlat on Prunus avium, followed by G5 and Prunus mahaleb rootstocks. The highest phosphorus content was found in G5 for both cultivars.