Status Fe, Zn i Mn u listu cv. Malvazije istarske (Vitis vinifera L.) s četiri lokacije sjeverozapadne Istre | Status of Fe, Zn and Mn in cv. Istrian Malvasia (Vitis vinifera L.) leaf from four locations in north-western Istria

Croatian. Analiza biljnog materijala osnova je utvrđivanja statusa hraniva te planiranja kontrolirane ishrane vinove loze. Cilj ovog rada bio je utvrditi status Fe, Zn i Mn u listu cv. Malvazije istarske, kao izrazito značajnih mikroelemenata, kako za rast i razvoj same biljke, tako i za kvalitetu vina. Istraživanja su provedena u četiri vinograda podignuta na četiri tipa tla (terroira), podtipa vitisola: crvenici, smeđem tlu na laporu te na dvije rendzine na laporu s različitom količinom CaO. Za utvrđivanje statusa Fe, Zn i Mn uzeti su cijeli listovi (peteljka+plojka) dvaput kroz vegetaciju, u fenofazi cvatnje i šare tijekom 2013. i 2014. godine. Vrijednosti Fe u listu u fenofazi cvatnje kretale su se od 70 do 89 mg kg-1, a u šari 71 – 101 mg kg-1. Status Zn kretao se u rasponu 20 – 33 mg kg-1 u cvatnji te 17 – 42 mg kg-1 u šari. Vrijednosti Mn u cvatnji iznosile su 56 – 349 mg kg-1, a u šari 88 - 565 mg kg-1. Međutim, usporedivši dobivene vrijednosti s referentnim, sve vrijednosti Fe i Zn bile su na donjoj granici optimalnog, dok je opskrba Mn bila dostatna. Dobivene različite vrijednosti na pojedinoj lokaciji upućuju na potrebu prilagodbe i dizajniranja gnojidbe za svaku lokaciju.

English. Analysis of plant material is the basis for determining nutrient status and planning controlled grapevine nutrition. The aim of this study was to determine the status of Fe, Zn and Mn in cv. Istrian Malvasia leaf as important microelements for both the growth and development of the plant, but also for wine quality. The experiment was set up in four vineyards (terroirs) on four soil types, subtypes vitisols: red soil, brown soil on marl, and the two rendzinas on marl with different amounts of CaO. To determine the status of Fe, Zn and Mn, whole leaves (petiole+blade) were taken twice through the vegetation, in the stage of bloom and veraison during 2013 and 2014. Determined Fe values ranged from 70 to 89 mg kg-1 in bloom stage, while from 71 to 101 mg kg-1 in veraison. Zn ranged from 20 to 33 mg kg-1 in bloom, and from 17 to 42 mg kg-1 in veraison. Determined Mn ranged in bloom from 56 to 349 mg kg-1, while in veraison from 88 to 565 mg kg- 1. However, in comparison to reference values, Fe and Zn values were within minimal for grapevine needs, while Mn values were sufficient. Different values suggest the need of a personally designed fertilization for every location.