Respon Morfo-Fisiologi dan Penurunan Skor Getah Kuning Buah Manggis (Garcinia mangostana L.) Terhadap Aplikasi Ca Secara Eksternal; Morpho-Physiology Response And Yellow Latex Reduce On External Calcium Application On Mangosteen Fruit (Garcinia mangostan

Abstract

yellow latex (gamboges) in mangosteen resulted from the damage of epithelium wall secretory duct in the pericarp is presumably caused by deficiency of calcium. The application of Ca to the soil didn't reduce yellow latex, so the alternative method may need to be tried to study the effect of calcium spraying on the morpho-physiological characteristic and reducing yellow latex on the mangosteen fruits. The Randomized Block Design with three replications was applied on fruit surface of +30 years old mangosteen trees in Leuwiliang subdistrict. The treatments were CaCl2 and Ca (OH)2 (concentration 0.25. 0.5 and 1 M) was performed at the 2nd, 4th, 6th, 8th weeks after anthesis (WAA). The result showed that Ca application was generally able to decrease yellow latex score on the skin as well as in the aril. The reduction of yellow latex score on skin was highest on Ca(OH) 1M treatment (26%) while on the aril it was CaCl2 0.5 M treatment (28%). The physiology respond showed that the increase Ca pectat was in accordance to the reduction of yellow latex score on the skin fruit. The morphology responds such as edible portion, firmness, soluble solute and titrated acid didn't influence by application Ca.