Abstract
The long term effect of black hail netting (20% shading) on budding percentage, but fertility, cane mass, yield, bunch mass, berry mass and berry cracking as well as sugar concentration (total soluble solids), acid concentration (titratable acidity) and pH of the berry juice of table grapes (cultivars Pirobella, Bien Donne, Ronelle and Italia) was evaluated. Budding percentage and bud fertility were significantly reduced by hail netting. Reproductive growth in terms of yield and bunch mass seemed to be higher under hail netting compared to direct sunlight, while berry mass was not affected. Berry cracking tended to decrease under hail netting. Berry sugar concentration and pH decreased significantly under hail netting, while the acid concentration increased.
Highlights
Die Icmgtermyneffek van swart haelnette (20%- heskacluwingseffek) op tafeldruiwe se hotpersentasie, oogvrughaarheid, lootmassu, oesmassa, trosmassa, korrelmassa en -bars, asook suikerkonsentrasie, suurkonsentrasie en pH is ondersoek
The effect o f hail netting on the performance o f table grapes Vitis vinifera (L.) in the summer rainfall region
The long term effect o f black hail netting (20% shading) on budding percentage, butfertility, cane mass, yield, bunch mass, berry mass and berry cracking as well as sugar concentration, acid concentration and pH o f the berry juice o f table grapes was evaluated
Summary
Eksperimentele wingerd ’n Vier jaar oue wingerd by die Instituut vir Groente en Sierplante te Roodeplaat, naby Pretoria is gebruik. Vier bostokkultivars met bekende virusstatus (tabel 1) met variërende seisoenlengte is gekies om die invloed van die lengte van die groeiseisoen te bepaal. Twee behandelings is volledig ewekansig binne elke kultivarblok met vier herhalings toegeken. Elke herhaling het bestaan uit vyf potensiële proefstokke, waarvan twee vergelykbare proefstokke op ’n basis van stam deursnee as datastokke gekies is. Botpersentasie (getal oë gebot as ’n persentasie van die oë toegeken tydens wintersnoei) en vrugbaarheid (getal trosse per loot vanuit oë toegeken tydens wintersnoei) is in die wingerd bepaal. Gemiddelde trosmassa per stok is bereken uit die massas van 20 ewekansig gekose trosse. Vyf korrels is ewekansig van elk van die 20 trosse gekies. Genetiese oorsprong en virusstatus van die bostol^ltultivars wat in die ei(sperimentele wingerd bestudeer is KULTIVAR
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