Effects of Chemical Thinning of Sour Cherrry Flowers

Abstract

The paper presents the results of chemical thinning of sour cherry flowers of the Šumadinka and the Čačanski rubin cultivars. The treatments were performed in the full flowering phase, using 0.0025% concentration of the LG-GER- ATS (ammonium thiosulphate). Following the application of the LG-GER-ATS, the number of set fruits was reduced by 9.8% and 8.0% for the Šumadinka and Čačanski rubin cultivars respectively, compared to trees receiving no treatment. The thinning of the flowers had an impact on the increase of the fruit mass by 19.1% and 10.9% in the Šumadinka and the Čačanski rubin cultivars respectively. Trees treated with LG-GER-ATS recorded a higher yield in both years of trial – the yield in Šumadinka cultivar was higher by 20.7% per tree, while the yield of the Čačanski rubin cultivar was higher by 17.1% per tree.

U radu su prikazani rezultati hemijskog proređivanja cvetova višanja, sorti Šumadinke i Čačanski rubin. Tretiranja su obavljena u fazi punog cvetanja preparatom LG-GER- ATS (amonijum tiosulfat) u koncentraciji od 0,25%. Primenom preparata LG-GER-ATS smanjen je broj zametnutih plodova za 9,8% kod sorte Šumadinka i za 8,0% kod sorte Čačanski rubin u odnosu na netretirana stabla. Proređivanje cvetova uticalo je na povećanje mase plodova za 19,1% kod sorte Šumadinka i za 10,9% kod sorte Čačanski rubin, dok se sadržaj rastvorljivih suvih materija u plodovima nije bitnije razlikovao između ispitivanih tretmana. Stabla tretirana amonijum tiosulfatom ostvarila su veće prinosi u obe godine ispitivanja za 20,7% po stablu ili 26,5% po jedinici površine kod sorte Šumadinka i za 17,1% po stablu ili 19,6% po jedinici površine kod sorte Čačanski rubin.