Hemijsko proređivanje cvetova sorti šljiva

Abstract

U radu su prikazani rezultati hemijskog proređivanja cvetova sorti šljiva pogodnih za susenje, Čačanska rodna, Stanley, Valjevka i Bluefree. Tretiranja su obavljena u fazi punog cvetanja preparatom LG-GER-ATS (amonijum tiosulfat) u koncentraciji od 0,0025%. Ogledom su obuhvaćena tri tretmana: I tretman - tretiranje cele krošnje; II tretman - tretiranje polovine krošnje po visini u smeru pružanja redova i III tretman - kontrola (netretirana stabla). Tretiranje stabala šljiva amonijum tiosulfatom uticalo je na povećanje krupnoće plodova i prinose u tretmanima I i II u odnosu na kontrolni tretman.

The paper presents the results of chemical thinning of flowers of plum cultivars suitable for drying - 'Čačanska Rodna', 'Stanley', 'Valjevka' and 'Bluefree'. The treatments were performed during the phase of full bloom, using the LG-GER-ATS (ammonium thiosulphate) in a 0.0025% concentration. The trial comprised three treatments: treatment I - treating the entire crown; treatment II - treating one half of the crown height-wise, in the direction of the rows and treatment III - control treatment (trees receiving no treatment). The application of the ammonium thiosulphate treatment on the trees resulted in the increased size and yield of the fruits subjected to treatments I and II, in comparison to the control treatment. The application of the ammonium thiosulphate made an impact on the size of fruits in all the cultivars in the trial. The largest fruit dimension and mass was recorded in treatment I, while the smallest was detected in treatment III. The fruit mass of the 'Čačanska Rodna' cultivar was higher by 8.7 g (22.8%) in treatment I, i.e. by 5.1 g (14.7%) higher in treatment II; the fruit mass of the 'Stanley' cultivar was higher by 7.0 g (17.3%) in treatment I, i.e. 3.7 g (9.9%) higher in treatment II; the fruit mass of the 'Bluefree' cultivar was higher by 5.7 g (10.9%) in treatment I, i.e. by 2.4 g (4.9%) higher in treatment II - all in comparison with the non-treated trees. The highest yield per tree was recorded in treatment I, while the lowest was detected in treatment III. In the 'Čačanska Rodna' cultivar, the yield was higher by 6.3 kg (14.8%) in treatment I, i.e. by 3.3 kg (8.4%) higher in treatment II; the yield of the 'Stanley' cultivar was higher by 3.7 kg (9.2%) in treatment I, i.e. it was by 2.1 kg (5.4%) higher in treatment II; the yield of the 'Bluefree' cultivar was higher by 1.9 kg (7.5%) in treatment I and by 0.8 kg (3.5%) in treatment II; the yield in the 'Valjevka' cultivar was higher by 4.0 kg (10.9%) in treatment I, .e. it was by 1.0 kg (3.0%) higher in treatment II - all in comparison with the control group. The yield per unit of area in the 'Čačanska Rodna', 'Stanley' and 'Bluefree' cultivars did not show significant differences between the treatments, while the highest ant the lowest yield in the 'Valjevka' cultivar were recorded in treatment I and treatment III, respectively.