Višegodišnjim istraživanjima biljno-hranidbenog kapaciteta tla metodom folijarne dijagnoze u plantaži jabuka Borinci na antropogenom eutričnom smeđem tlu na karbonatnom lesu u semiaridnom području istočne Slavonije utvrđene su genetske,
odnosno sortne specifičnosti, mineralne ishrane. Istraživanja su obavljena u plantaži Borinci kraj Vinkovaca na 5 do 11 godina starim stablima sorata: Golden Delicious, Gloster, Melrous, Idared, Red Boskoop, Jonagold i Jonathan, cijepljenim na podlozi M9. Jabuke su dostatno opskrbljene dušikom i kalijem, a optimalno fosforom,kalcijem i magnezijem. Veće variranje utvrđeno je u koncentraciji dušika i kalija. Genetske, odnosno sortne specifičnosti odrazile su utjecaj na koncentraciju dušika, kalija i kalcija, dok je razina fosfora i magnezija uglavnom podjednaka u lišću svih istraživanih sorti. Najveću koncentraciju dušika sadrži lišće sorte Gloster, a najmanju sorte Golden Deliciou. Signifikantna je razlika između ove dvije sorte i u njihovu odnosu na ostale sorte. Podjednaku koncentraciju dušika sadrži lišće skupine sorti Melrous, Jonagold i Jonathan, kao i u skupine sorti Idared i Melrous. Utvrđena je signifikantna razlika između dvije skupine sorti. Veću koncentraciju kalija ima lišće sorte Melrous od ostalih sorti. Razlika je signifikantna. Manju koncentraciju kalija sadrži lišće sorti Gloster,
Idared i Jonathan od sorti Golden Delicious i Jonagold. Razlika je statistički opravdana. Signifikantno nižu koncentraciju kalcija sadrži lišće sorte Melrous od ostalih soreti. Signifikantno veću koncentraciju kalcija sadrži lišće sorata Golden Delicious, Gloster, i Idared od sorata Jonagold i Jonathan.Investigations of the plant feeding capacity of the soil using foliar diagnosis method on apple plantation on antropogenous brown soil on calcareous loess were carried out over the period of six years in the eastern Croatia for determination of genetic, i.e. cultivar features of mineral nutrition. The investigations were carried out on the
plantation of the Borinci near Vinkovci on 5 to 11 year old trees in the cultivars: Golden Delicious, Gloster, Melrous, Idared, Red Boskoop, Jonagold and Jonathan grafted on rootstock M9. Apples are sufficiently supplied with nitrogen and potassium, and optimal supply of phosphorus, calcium and magnesium. Greater variations were
determined in concentrations of nitrogen and potassium. Genetic and variety specificity has reflected its influence to concentration of nitrogen, potassium and calcium while levels of phosphorus and magnesium are rather equal in leafs of investigated cultivars.
The level of nitrogen was the highest in the leaves of cv. Gloster and the lowest in cv. Golden Delicious. There is a significant difference between these two cultivars and in their relation to other cultivars.
Equal concentrations of nitrogen are determined in leafs of cultivars Melrous, Jonagold and Jonathan, as well as in cultivars Idared and Melrous. Significant difference is determined between two groups of cultivars. The concentration of potassium was higher in leafs of cultivar Melrous than in leafs of other cultivars. The difference is significant. The concentration of potassium was lower in leafs of cultivars Gloster, Idared and Jonathan than in leafs of cultivars Golden Delicious and Jonagold. The difference is statistically justified. Significantly lower concentration of potassium was found in leafs of cultivars Gloster, Idared and Jonathan than in cultivars Golden
Delicious and Jinagold. The difference is statistically justified. Leafs of cultivar Melrous have significantly lower concentration of calcium than other cultivars. Significantly higher concentration of calcium was found in leafs of cultivars Golden Delicious, Gloster and Idared than in cultivars Jonagold and Jonathan
