Influence of fertilization with mineral and organic fertilizers on the quantity and dynamics of calcium and magnesium in grapevine leaves

U vinogradarstvu gnojidba se provodi zbog povedanja prinosa i kvalitete grožđa. Nedostatak organske tvari utječe na pogoršanje fizikalnih svojstva tla, smanjenje biološke aktivnosti u tlu, te posebno utječe na slabije primanje biogenih elemenata kao što su dušik, fosfor, kalcij, magnezij i željezo. Cilj ovog diplomskog rada je utvrditi količinu kalcija i magnezija u lišdu vinove loze, te dinamiku ishranjenosti tijekom tri vegetacije nakon primjene različitih vrsta i količina gnojiva. U istraživanje je bilo uključeno šest tretmana gnojidbe (kontrola-bez gnojidbe, 20 t ha-1 zrelog stajskog gnoja, 40 t ha-1 zrelog stajskog gnoja, 20 000 l ha-1 kiselog treseta, 40 000 l ha -1 kiselog treseta i 500 kg NPK 5:20:30 ha-1 s dvije prihrane URE-om sa po 100 kg ha-1. Uzorkovanje lišda provedeno je 3 puta tijekom vegetacije: u cvatnji, dva tjedna nakon cvatnje i šari. Statistički najveda vrijednost kalcija u lišdu vinove loze utvrđena je u tredem uzorkovanju 5,85 % u 2. godini istraživanja, a najniža u cvatnji 1,60 % u 3. godini. Najvede vrijednosti magnezija utvrđene su u drugoj godini istraživanja u šari, a relativno najveda količina magnezija utvrđena je pri gnojidbi s 40 t ha-1 stajskog gnoja (0,36, 0,47 i 0,41 % Mg) u sve tri godine istraživanja.In viticulture, fertilizing is used to increase the yield and quality of the grapes. Lack of organic matter affects on impairment of soil physical properties, reducing the biological activity and especially affects on the low uptake of some plant nutrient such as nitrogen, phosphorus, calcium, magnesium and iron. The objective of this study was to determine the quantity of calcium and magnesium in grape-vine leaves, and the dynamics of nutrition during three vegetation after application of different types and amounts of fertilizers. Six manure treatments were included in the study (control-without fertilization, 20 t ha-1 of ripe livestock manure, 40 t ha-1 of ripe livestock manure, 20 000 l ha-1 of acid peat, 40 000 l ha -1 of acid peat and 500 kg of NPK 5:20:30 ha-1 with two fed UREA with 100 kg ha-1 each. Leaves sampling was carried out three times during the vegetation : flowering, two weeks after flowering and veraison. The statistically highest calcium value in vine leaves was determined in the third sampling of 5.85 % in second year of research, and the lowest in flowering of 1.60 % in the third year. Maximum magnesium values were determined in the third sampling in the second year of research, and the relatively highest magnesium content was determined during fertilization with 40 t ha-1 livestock manure (0.36, 0.47 and 0.41% Mg) in all three years of research