Photoselective nets and quality of apple fruit cv. 'Braeburn'

Cilj ovog istraživanja bio je utvrditi postoje li razlike u svojstvima kakvoće plodova jabuke sorte 'Braeburn' ovisno o uzgoju ispod različito obojenih fotoselektivnih zaštitnih mreža. Promatrao se utjecaj Agritennax bijele, ţute i crvene mreže na svojstva kakvoće plodova (sadržaj topljive suhe tvari, ukupne kiseline, tvrdoću plodova, omjer topljive suhe tvari i kiselina i boju plodova) te masu plodova i prirod po stablu. Statistički opravdana razlika utjecaja različitih fotoselektivnih mreža utvrđena je za prirod po stablu, tvrdoću plodova te sve istraživane parametre obojenosti ploda. Najviše vrijednosti za svojstva prirod po stablu, masa ploda i ukupne kiseline utvrđene su kod primjene crvene mreže dok su kod primjene žute mreže najviši rezultati utvrđeni za omjer topljive suhe tvari i kiselina. Primjena fotoselektivnih mreža pozitivno utječe na sva istraživana svojstva kakvoće ploda osim na sadržaj topljive suhe tvari plodova. Najveći omjer topljive suhe tvari i kiselina utvrđen je na plodovima uzgajanima ispod žute, a najniži ispod crvene mreže. Masa plodova uzgajanih ispod crvene mreže u prosjeku je veća za 29,10 g, kod primjene bijelih mreža za 23,5 g i žutih mreža za 21,95 g u odnosu na kontrolni tretman gdje fotoselektivne mreže nisu primijenjene. Zaključuje se kako fotoselektivne mreže promjenom spektralnog sastava svjetlosti pozitivno djeluju na razvoj boje kožice ploda, masu plodova te pozitivno utječu na prirod i u konačnici na ekonomsku isplativost proizvodnje.The aim of this study was to determine whether there are differences in the quality properties of the apple fruit cv. 'Braeburn', depending on the application of different colored photoselective anti-insect nets. The effect of Agritennax white, yellow and red netting was tested on fruit quality traits (soluble solids content, total acidity, fruit firmness, the ratio of soluble solids content and acids and fruit color) and fruit mass and yield per tree. Significant effect of photoselective nets usage was determined for yield per tree, fruit firmness and all the studied colour parameters. The highest values of yield per tree, fruit mass and total acid were found in fruit grown under red net while usage of the yellow net obtained highest results for the ratio of soluble solids content and acids. Application of photoselective nets has a positive effect on all studied fruit quality traits except soluble solids content. The highest results in ratio of soluble solids content and acids were identified in the application of the yellow net, and the lowest in the application of red. Fruit mass of apples grown under the red net has been increased for 29.10 g. The application of white net increased fruit mass for 23.5 g and yellow net for 21.95 g compared to the control treatment where photoselective nets were not applied. The conclusion is that photoselective netting, by changing the spectral composition of light, had a positive effect on the fruit skin color development, fruit weight and positively affects the yield as also ultimately has a beneficial effect to the economic viability of production