Influence of silicon and titanium on the quantity and quality of pears (Pyrus communis L.) cultivar ‘Williams’

Namen diplomskega dela je bil ugotoviti vpliv pripravkov s silicijem in titanom na količino in kakovost plodov navadne hruške (Pyrus communis L.) sorte \u27Viljamovka\u27. Poskus smo izvedli leta 2020 v Hortikulturnem centru Biotehniške fakultete v Orehovljah. V prvem obravnavanju smo drevesa foliarno škropili s pripravkom Tytanit, ki vsebuje Ti, v drugem s pripravkoma Tytanit + Optysil (Si), v tretjem s pripravkom Optysil. Četrto obravnavanje je bila kontrola - netretirana drevesa. Na vseh drevesih smo izmerili obseg debla in prešteli število cvetnih šopov/drevo. Po obiranju smo plodove razvrstili glede na premer v I. in II. kakovostni razred, prešteli število plodov/drevo in pridelek stehtali za vsako drevo posebej. Plodovom smo izmerili višino in širino, maso, trdoto mesa, vsebnost topne suhe snovi ter parametre osnovne in krovne barve. Ugotovili smo, da je pripravek Tytanit pozitivno vplival na vsebnost topne suhe snovi in povečal trdoto mesa plodov. Prav tako je na večjo vsebnost topne suhe snovi vplival pripravek Optysil in kombinacija pripravkov Tytanit + Optysil. Drevesa, ki smo jih tretirali s pripravkoma Tytanit in Optysil, so imela manjši pridelek. Pridelek (t/ha) je bil pri drevesih tretiranih s pripravkom Tytanit za 12,1 t manjši v primerjavi s kontrolnimi (netretiranimi) drevesi.The aim of this graduation thesis was to determine the influence of silicon and titanium products on the quantity and quality of pear (Pyrus communis L.) cultivar \u27Williams\u27. The experiment was performed in 2020 in the Horticultural Center of the Biotechnical Faculty in Orehovlje. In the first treatment, foliar spraying of the trees was performed using Tytanit, which contains Ti, in the second treatment Tytanit + Optysil (Si) were used, the third treatment was performed with Optysil. The fourth treatment was for control and trees were left untreated. The trunk circumference of all trees was measured and the number of flower clusters/tree was counted. After harvest, the fruits were sorted according to their diameter in first and second quality class, the number of fruits per tree was counted and the yield for each tree was weighted separately. Measurements of the fruit height and width, weight, firmness and soluble solids content were performedground and cover colour parameters were determined. It was established that Tytanit had a positive effect on the soluble solids content and increased the flesh firmness. The higher content of soluble solids was also achieved with Optysil and the combination of Tytanit + Optysil. The trees treated with Tytanit and Optysil had a lower yield. The yield (t/ha) was 12,1 tones lower in trees treated with Tytanit compared to control (untreated) trees