Judul: Dinamika Infestasi dan Karakter Ekofisiologi Gulma di Daerah Penyangga Taman Nasional Lore Lindu
Abstrak: The objectives of the study were (1) to evaluate the weed dynamic infestation as one component of ecosystem changes from forest to agricultural ecosystems, especially the changes in diversities and type of weed due to different system of agronomic practices, (2) to identify morphological, anatomical, and physiological traits of weed in relation to its adaptation and competition. (3) to study the competition effect of weed on the yield of maize, and (4) to find out critical periods on control weed and its affect on the growth and yield of maize as well as to know the appropriate time to control weed on maize production
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Judul: Dinamika Gulma Lahan Pertanian pada Sistem Olah Tanah Konservasi
Abstrak: Research of weed dynamics on land preparation with conservation tillage system has been conducted at experimental farm of Institut Pertanian Bogor, Dramaga, Bogor, from August until September 2011. The research objective was to study the effect of glyphosate herbicide and decomposer combination on weed control in conservation tillage. The research used Completely Randomized Block Design with nine treatments i.e. glyphosate 5.0 l/ha + decomposer 5.5 l/ha (P1), glyphosate 5.0 l/ha + decomposer 4.4 l/ha (P2), glyphosate 5.0 l/ha + decomposer 0.0 l/ha (P3), glyphosate 4.0 l/ha + decomposer 5.5 l/ha (P4), glyphosate 4.0 l/ha + decomposer 4.4 l/ha (P5), glyphosate 4.0 l/ha + decomposer 0.0 l/ha (P6), glyphosate 3.0 l/ha + decomposer 5.5 l/ha (P7), glyphosate 3.0 l/ha + decomposer 4.4 l/ha (P8), dan glyphosate 3.0 l/ha + decomposer 0.0 l/ha. The result showed that weed dominant were Paspalum conjugatum (51.46 %), Mimosa pudica (15.75 %), dan Borerria alata (9.03 %). Application glyphosate 3.0 l/ha + decomposer 0.0 l/ha could reduce weed dry weight biomas
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition