Judul: Study on spatio-temporal dynamics of weed communities in rice field landscape of Ciliwung-Cisadane watershed
Abstrak: The distribution of rice field landscape of Ciliwung-Cisadane Watershed through from lowland (in the down stream) until highland (in the upper stream). Gradually, the condition of rice field landscape in the lowland di fferent with in the highland. The differences of biophysical condition come to differ of weed composition growing. Weed problem always present as part of rice cultivation. Weed infestation cause to injury competition, so weed control is a necessity. Up to now, the planning of weed control strategy based on vegetation analysis are valued still often not too exactly. This is caused vegetation analysis no give enough information about the changing of weed communities of different time and its distribution of various locations as well as the influential factors in a regional scale with vries biophysical conditions. The objectives of this research were (1) to analyze the pattern of rice field distribution in Ciliwung-Cisadane Watershed, (2) to analyze the composition of weed community and dominant weed species along with their variation through season/stage of rice crop growth, (3) to analyze the distribution of weed dominan species and weed infestation level together with their changing through season/stage of rice crop growth, (4) to analyze the correlation among factors which were influential of weed infestation, rice production, and efficiency of rice farming, and (5) to formulate the supposition models the effect of physical environments, cultivation practices, socio-economics and accessibilities to weed infestation level, rice production, and efficiency of rice farming.
Keyword: Distribusi lahan sawah, Distribusi jenis gulma, Usahatani padi sawah

Judul: Pengendalian Gulma Padi Sawah dengan Herbisida Berbahan Aktif Bispyribac Sodium
Abstrak: One of the main problems on increasing rice production is weeds. The objective of this research was to determine the effectiveness of bispyribac sodium herbicide to control weed in paddy field. The experiment was conducted in Cibanteng village, Bogor regency, West Java from November 2012 to February 2013. The research was arranged at randomized block design with four replications which consisted of eight bispyribac sodium treatments i.e: 50 ml ha-1, 100 ml ha-1, 150 ml ha-1, 200 ml ha-1, 250 ml ha-1, 300 ml ha-1, manual weeding and no weeding. The result showed that the application of bispyribac sodium herbicide at a dose of 50 ml ha-1 to 300 ml ha-1 could control Ludwigia octovalvis, Echinocloa crus-galli, Fimbristylis miliacea, Eclipta prostata and Cynodon dactylon weed species. Bispyribac sodium application at all dosages only caused lightweihgt Phytotoxicity Syimptoms on rice plants
Keyword: weed, rice, dosage, bispyribac sodium herbicide

Judul: Sintesis BaTiO3 dari Campuran Ba(OH)2 dan TiO2 dengan Tambahan PbO
Abstrak: Piezoelectric material can generate electric field in response to applied mechanical stress. Conversely, they can stretch and contract in response to an electric field. This material can be used for many applications such as transducer, microphone, ultrasound, and pressure gauge. Barium titanate is a ferroelectric material with piezoelectric properties that can be synthesized easily. The aim of this study is to synthesis barium titanate from mixture of Ba(OH)2 and TiO2, also observe its optimum temperature and the effect of PbO addition. The method of synthesis was solid-state reaction and sol-gel method, then the products were characterized with x-ray diffraction (XRD). Based on XRD analysis, the optimum temperature for both methods was 800°C. Addition of PbO to BaTiO3 in the solid-state reaction formed a compound with formula of Ba1-xPbxTiO3. The addition has changed diffraction pattern peak at 2θ and strengthened its tetragonal structure. The best result was obtained at x of 0.5 which will form a compound of Ba0.5Pb0.5TiO3.
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