Judul: Study Application Time of Calcium to Control Yellow Latex and Quality of Mangosteen Fruit (Garcinia mangostana L.).
Abstrak: Yellow latex on aryl and pericarp of mangosteen associated with low calcium content in fruit. Calcium is immobile nutrient, which its absorption is strongly influenced by transpiration. Therefore calcium soil application is needed to increase calcium content in the fruit. Application time of calcium have to be studied to maximizing calcium effects in reducing yellow latex on mangosteen fruit. The aim of this study was to study the application time of calcium to control yellow latex on manggosten fruit. The experiment was laid out on a randomized complete block design. There are eight treatments as follow: (1) no calcium fertilizer as control, (2) at anthesis stage, (3) at the beginning of stage 1 of fruit growth (14 days after anthesis), (4) at the end of stage 1 (28 days after anthesis), (5) at anthesis and the beginning of stage 1, (6) at anthesis and the end of stage 1, (7) at the beginning and end of stage 1, (8) at anthesis, beginning and end of stage 1. Application time of calcium at anthesis and the end of stage 1 effectively reduced yellow latex in aryl, pericarp, and increased calcium in endocarp. However calcium applications did not affect the physical and chemical properties of the fruit.
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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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