Judul: Karakteristik Pertumbuhan dan Produksi Delapan Varietas Kacang Tanah (Arachis hypogaea L.).
Abstrak: The research was aimed to indentify the growth characteristics that influence filling of the pod and productivity of the groundnut. This research was conducted at Leuwikopo Experimental Field, Departement of Agronomy and Horticulture, IPB, Dramaga, on February to June 2010. The method of this research was based on a completely block randomized design, consisted of one factor and three repetitions. The factor was eight varieties, namely Pelanduk, Sima, Gajah, Turangga, Panther, Anoa, Kelinci, and Kidang. The data was analyzed by using F test. If there was significantly difference then it would be followed by Duncan Multiple Range Test (DMRT). The result showed that varieties affect signifficantly to the total of leaves, branch, and peg, weight of leaves, branch, and peg, and lenghth of the plants in several weeks of observations. Each varieties has difference characteristics of gowth and production. Pelanduk had highest growth characteristics. Gajah was the fastest on pod filling. Panther had highest growth parameter and production variables. Anoa was not really good at growth characteristic and pod filling so the productivity was low. Kidang had high dry matters and good at pod fillling. Sima, Kelinci, and Turangga had high total pod, but not so good at pod filling.
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Judul: Keragaman dan Korelasi Antara Peubah Pertumbuhan dan Produksi pada Delapan Varietas Kacang Tanah (Arachis hypogaea L.).
Abstrak: The objective of this research was to identify growth characteristic that affect the pods filling and production of eight varieties of groundnut. This research was conducted at the Lewikopo Experimental Farm, Darmaga, Bogor from February to July 2010 on Latosol soil. The varieties of groundnut in this experiment were Badak, Garuda3, Jerapah, Kancil, Mahesa, Singa, Tapir, and Trenggiling. Data analysis used the F test and if there was significant difference then followed by Duncan Multiple Range Test (DMRT). Correlation analysis between growth and production variables. The results showed that Mahesa variety had a good canopy during the growth but the number of pods and pods per plant dry weight were significantly lower that influenced low productivity. Garuda3 variety had a good canopy until pods formation phase. The number of pods per plant was significantly lower but good in pods filling and had a high percentage of full pods. Singa variety had a lush canopy during the growth but the pods dry weight was low because had a lot of the number of gynophorum and percentage cipo pods was high. Kancil variety had not noticeable growth of leaves, branches, and pods during growth. Productivity of pods and seeds were high, supported by the average number of full pods high so the percentage of full pods also high due to the long time of pods filling. Badak variety had a lush canopy during the growth and the number of pods and half full pods were significantly and the average number of full pods and cipo pods were high. Jerapah variety had not noticeable growth of leaves, branches, gynophorums, and pods during the growth and maximum growth rate at early flowering time until the pods formation phase. Jerapah variety less in shaping of pods and the number of pods and half full pods were significantly lower and the average number of pods cipo was lower. The canopy of Tapir variety increased during the growth and well in pods filling and had a high percentage of full pods. Trenggiling variety had the number of pods and half full pods were significantly lower but could produced high productivity of pods and seeds. Correlations between growth and production variables showed that the percentage of full pods affected by the gynophorum dry weight at pods formation phase and pods dry weight at toward harvest. Percentage of cipo pods affected by gynophorum dry weight and pods dry weight at toward harvest. Harvest index affected by the ILD during growth and CGR at towad harvest. Pods productivity affected by harvest index and seeds productivity affected by the percentage of full pods.
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Judul: Sintesis dan Pencirian Membran Komposit Polistirena Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: This study focused on synthesis and characterization of sulfonated polystyrene (SPS)-zeolit composite membrane as a proton exchange membrane for direct methanol fuel cell (DMFC). Sulfonation of polistyrene was done by using SO3 gas from oleum at 60 oC. The composite membrane was then synthesized with zeolite composition variation of 3%, 5%, and 7%. The success of the sulfonation process was indicated by the highest degree of sulfonation of PSS membrane with 15% concentration of polystyrene, that was 99.93%. The PSS Fourier transform infrared spectra of the composite membranes showed sulfonate group (-SO3) at 910.44 cm-1 and O-Si-O at 1091 cm-1. Topography study by using atomatic force microscope showed that the sulfonate groups of PSS were covered by the zeolite. The highest water uptake, proton conductivity, and potential difference were showed by the composite membrane with 5% of zeolite, that were 10.17%, 2.0339 10-6 S/cm, dan 15 mV respectively, showing that the PSS membrane can be applied in DMFC system.
Keyword: zeolite, sulfonation, polystyrene, DMFC, composite