engleski

The effect of photo-selective nets on yield and fruit quality of apple cv. Braeburn and peach cv. Suncrest under Croatian agro-climatic conditions

The usage of photo-selective anti hail nets has been studied recently because of its ability to reduce damages from hailstorms and flying pests and increase yield and fruit quality of various fruit crops. It represents a new, innovative and ecofriendly approach that is being tested on various horticultural crops worldwide. In this study, four types of nets (three types from Tenax (Italy) (red, white and yellow) and Stop Drosophila Normal from Artes Politecnica (Italy)) were used on apple cv. Braeburn and peach cv. Suncrest orchard in northern Croatia in order to evaluate their efficacy on fruit quality and yield apart from their anti-hail and pest damage protection properties. The apples were harvested on 12th October 2015 and peach were harvested at two different times due to the difference in maturation (04 August 2015 yellow, drosophila nets and control fruit and on 07 August 2015, red and white net fruit were harvested). On apple, significant difference in fruit weight existed between red, white and yellow nets (188, 88 g, 183, 28 g, 181, 73 g, respectively) on the one hand and Stop Drosophila Normal and control nets (157, 34 g, 159, 78 g, respectively) on the other hand. Trees under red and drosophila nets had significantly higher yield (12, 6 and 10, 33 kg per tree, respectively) than under yellow (9, 73 kg per tree), and white nets (5, 93 kg per tree) as well in control (5, 68 kg per tree). Trees under yellow nets had significantly higher yield than those under white net and control. Trees under yellow, red and Stop Drosophila Normal nets had significantly higher yield efficiency (0.52 kg·cm-2, 0.51 kg·cm-2 and 0.48 kg·cm-2 TCSA, respectively) efficiency than white nets and control (0.29 and 0.27 kg·cm-2 TCSA, respectively). Among all tested nets no significant differences were recorded for firmness, soluble solids concentration (SSC), titratable acidity (TA), SSC/TA and TCSA. Color index was higher in fruit grown under Stop Drosophila Normal and red nets than under white and yellow nets. No significant difference was between fruit under control, red and drosophila nets on the one hand, and control, white and yellow nets on the other hand. On peach, the results show that all the tested nets significantly affected yield (26.80 – 29.56 t·ha-1) as Climate Changing Agriculture compared to control (21.64 t·ha-1). Significant difference in firmness existed between fruit grown under yellow and Stop Drosophila Normal nets (4.77 and 5.20 kg·cm-2, respectively) on the one hand and those grown under red and white nets (3.79 and 3.73 kg·cm-2, respectively) on the other hand. The control trees had significantly smaller yield efficiency than white and red nets, while no significant difference was showed between control trees and trees under yellow and drosophila nets. There were no significant differences for SSC, TA, SSC/TA ratio, fruit weight, and TCSA among all tested nets.

apple, peach, photoselective netting

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