Judul: Study to Control Yellow Latex and Pericarp Hardening of Mangosteen Fruit (Garcinia mangostana L.) with Calcium Spraying Aplication.
Abstrak: Calcium is one of important elements of cell membrane component and strengthen cell wall. Calcium is normally bound to pectin compound as a middle lamella component. Calcium deficiency affect the degradation of cell wall integrity. Low calcium content in the pericarp of mangosteen fruit could triggering the incidence of yellow latex or gamboges disorder on aryl and fruit pericarp. An experiment was conducted to determine the optimum combination of spraying frequency and concentration of CaCl2 in controlling yellow latex, pericarp hardening and quality of fruit. Factorial experiment was designed with two factors and three replications. The first factor was frequency of CaCl2 spraying that consist of three levels, i.e twice, four and six times. The second factor was calcium concentration that consist of four levels, i.e 0, 12, 24 and 36 g L-1. Result indicated that the combination of frequency of six times with 24 g L-1 is effective to reduce percentage of yellow latex in the aryl by 86% and 69% in the pericarp without pericarp hardening and reduction in fruit quality at harvest time and after 20 days storage
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Judul: Control of gamboge disorder and improved quality of mangosteen fruit through application of two calcium sources in different dosage
Abstrak: Gamboge disorder is a major problem limiting marketable yield of mangosteen fruit. It is known to be related to low calcium content. Result of previous studies indicate that calcium soil application could increace calcium content in the fruit exocarp and reduce yellow latex in the fruit peel, but ineffective in the flesh. It is known that calcium application could not be sufficient for fruit calcium. Fulfillment of calcium in plants is influenced by the source of calcium and its dosage applied. An experiment was conducted to determine the proper combination of calcium source and its dosage in reducing yellow latex of fruit peel and flesh, also improving fruit quality. Implementations of the experiments conducted in the Kecamatan Kota Agung, Kabupaten Tanggamus, Lampung. Factorial experiment was designed with two factors: Calcium sources (calcitic lime (CaCO3) and dolomitic lime (CaMg(CO3)2) and calcium dosage (0, 2, 4, 6 ton ha-1 Ca). Calcium applied to the soil at blooming period. The experiment was laid out on a randomized complete block design. Leaves and fruits were sampled at harvesting period. Observation of the yellow latex in aryl and fruit peel, fruit physical properties carried out on the variables weight, diameter, fruit hardness, total dissolved solids, total titration acid, and preparation of samples for chemical analysis conducted at PKBT laboratory. Results indicated that application of dolomitic lime with calcium doses of 2 ton Ca ha-1 could increase calcium content of the fruit pericarp (especially exocarp) and reduce yellow latex in the fruit peel and flesh. Calcium application did not affect the physical and chemical properties of the fruit.
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Judul: Karakteristik Barisan Eksak Pendek HomR(N, ) dan HomR( ,N)
Abstrak: Module merupakan generaIisasi dari ruang ve}ctor, dimana pada ruang vektor skalar-skalamya berasal dati suatu lapangan (field) sedangkan pada module skaJar-skalamya merupalam unsur-unsur dan suatu ring R dengan unsur satuan. Dari suatu grup komutatif yang unsur-unsumya dipadukan dengan unsur-unsur dart suatu ring R, maka akan mengbastlk.an yang namanya R-module. Himpunan seroua fungsi homomorfisma yang memetakan dati R-module M ke R-module N dinotasikan sebagai HomiM,N), dimana HomiM,N) juga merupakan suatu R-module.
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