Ukuvunwa kwekhabe kwenziwa ngezandla ngombana isiqunto sokobana likhabe eliyi-greyidi yiphi kanye nokobana livuthiwe sithathwa nge-(in situ) mukhi walo. Ungadosi ikhabe esivinini. Sebenzisa umukhwa obukhali ukulisika esiqwini, utjhiye isiqu esiyi-4 cm ekhabeni ukujamisa islonda ekutheni singaboli okungenza bona ikhabe libole.
Isthelwesi kufanele sivuthwe ngokupheleleko ngombana nawungasikha singakavuthwa asisabe sisavuthwa. Indlela encono yokobana ubone bona ikhabe livuthiwe namkhana awa kukobana usebenzise i-refractometer. Thatha amasampula isimini yoke lokha i-Brix (amazinga weswigiri) afika ku-9 kuya ku-10% isimi kutjho bona isimu sele ilungle ukungavunwa.
Lokhu kuvumela bona uhlole umbala walo ngaphakathi nokobana uzwe ukunambitheka kwalo. Ezinye iinkomba kukoma kwesiqu kanye namakari aseduze kwesiqu okuyikomba yokobana isthelo sivuthiwe, nokobana asisatholi ukudla.
Enye mdumo ongakajayeleki eliwenza lokha nawulibetha ngesandla. Ukuvuna esimini eyodwa kwenziwa kabili nanyana kathathu ngaphambi kokobana kuvunwe zoke iinthelo. Ukuvuna kwenziwa ekuseni khulu lokha amazinga womtjhiso nakasapholileko.
Translated by Busisiwe Skhosana