Primena NAA i BA u hemijskom proređivanju plodova sorti jabuke grupe 'Red Delicious'

Abstract

U radu je ispitana efikasnost biljnih regulatora NAA i BA u hemijskom proređivanju zametnutih plodova sorti jabuke iz grupe 'Red Delicious' - 'Hapke Delicious', 'Scarlet Spur' i 'Red Chief'. U proređivanju plodova ispitivanih sorti jabuke primenjena su tri pojedinačna tretmana NAA (15 ppm, 20 ppm i 30 ppm) i četiri kombinovana tretmana BA + NAA (BA - 60 ppm, 100 ppm, 120 ppm ili 140 ppm + NAA 5 ppm). Svi primenjeni tretmani NAA i BA + NAA su doveli do smanjenja broja plodova po jedinici površine poprečnog preseka debla sorti 'Hapke Delicious' i 'Scarlet Spur', dok su isti efekat kod sorte 'Red Chief' imali tretmani pojedinačne primene NAA 20 ppm i 30 ppm, kao i kombinovane primene BA 140 ppm + NAA 5 ppm. Visoku efikasnost u proređivanju plodova, posmatranu kroz prosečnu masu i broj plodova koji pripadaju kategoriji krupnih ( GT 70 mm ili >75 mm), kao i broj plodova po jedinici površine poprečnog preseka debla, kod sorti 'Hapke Delicious' i 'Red Chief' imao je tretman BA 140 ppm + NAA 5 ppm, a kod sorte 'Scarlet Spur' tretman BA 100 ppm + NAA 5 ppm.

The paper presents the fruit thinning response to NAA and BA plant regulators of 'Red Delicious' spur and standard types - 'Hapke Delicious', 'Scarlet Spur' and 'Red Chief'. The experiment was designed to evaluate NAA, over a range of concentrations - 15 ppm, 20 ppm and 30 ppm when applied alone, and BA + NAA combinations (BA - 60 ppm, 100 ppm, 120 ppm or 140 ppm + NAA 5 ppm) for thinning the assessed apple cultivars. All the applied treatments with NAA and BA + NAA adequately thinned 'Hapke Delicious' and 'Scarlet Spur', whereas application of NAA 20 ppm and 30 ppm and combined treatment BA 140 ppm + NAA 5 ppm were effective fruit thinners for 'Red Chief'. In terms of the average fruit weight and number of fruits categorized as large ( GT 70 mm or >75 mm), as well as from the aspect of fruit number per trunk cross-sectional area, the variant of treatment BA 140 ppm + NAA 5 ppm was most effective on 'Hapke Delicious' and 'Red Chief, whereas BA 100 ppm + NAA 5 ppm had the best effect on 'Scarlet Spur'.