Judul: The variability of morpho-physio-logical characters among soybean varieties in relation with the plant dry matter accumulation and the yield potential
Abstrak: Untuk mengkaji karakter morfo-fisiologi yang berperan dalam menentukan taraf hasil biji tanaman kedelai, dilakukan penelitian lapang di Kebun Percobaan Jambegede Malang mulai bulan April sampai dengan Juli 1994. Percobaan dilaksanakan menggunakan Rancangan Acak Kelompok dengan ulangan tiga kali. Perlakuan terdiri dari 8 varietas tanaman kedelai berbeda tipe tumbuh dan umur kematangan biji.
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Judul: Growth, Physiological and Production Responses of Two Soybean Varieties to Difference N Dossages
Abstrak: Pemupukan diperlukan untuk menunjang pertumbuhan tanaman kedelai. Nitrogen merupakan salah satu jenis pupuk yang dibutuhkan kedelai dalam jumlah yang cukup banyak. Ketersediaan senyawa nitrogen di dalam tanah sangat terbatas karena senyawa ini memiliki sifat mudah hilang melalui pencucian maupun penguapan. Pemberian nitrogen pada waktu yang berbeda dapat berpengaruh terhadap produksi dan kualitas biji kedelai. Tujuan penelitian ini adalah untuk memperoleh informasi tentang respon morfologi dan fisiologi dari dua varietas kedelai terhadap pemberian N. Penelitian ini dilaksanakan di Kebun Percobaan Cikabayan, Institut Pertanian Bogor, Dramaga, Kabupaten Bogor. Penelitian ini menggunakan rancangan faktorial berupa rancangan kelompok lengkap teracak 2 faktor yaitu 2 varietas kedelai yang terdiri dari Tanggamus dan Biosoy 1 dengan 4 kombinasi dosis pupuk N di antaranya N0, N1, N2, dan N3 yang diulang sebanyak 2 ulangan. Dosis pupuk N yang digunakan sebanyak 11,5 kg ha-1. Hasil penelitian menunjukkan bahwa morfologi dan fisiologi dari kedua varietas kedelai yang digunakan tidak responsif terhadap adanya pemberian pupuk N, baik dosis maupun interval aplikasinya. Karakter morfologi tanaman lebih dipengaruhi oleh genetik dan kondisi lingkungan tumbuh dari masing-masing varietas yang digunakan, begitupun dengan karakter fisiologinya, sedangkan interaksi antara varietas dengan pemberian pupuk N tidak menunjukkan respon yang signifikan terhadap hasil tanaman yang didapatkan., Fertilization is needed to support the growth of soybean plants. Nitrogen is a type of fertilizer that is needed by soybeans in considerable amounts. The availability of nitrogen compounds in the soil is very limited because these compounds are easily lost through leaching or evaporation. Aplication of nitrogen at different times is able to affect the production and quality of soybean seeds. The purpose of this study was to attain information about the morphology and physiology responses from two soybean varieties to the supply of N. This research was conducted at the Cikabayan Experimental Station, IPB University, Dramaga, Bogor Regency. This study used a factorial design in the form of a randomized complete block design with 2 factors, namely 2 soybean varieties consisting of Tanggamus and Biosoy 1 and 4 combinations of N fertilizer doses that were N0, N1, N2 and N3 with 2 replications. The dosage of fertilizer used was 11,5 kg ha-1. The results showed that the morphology and physiology of the two soybean varieties used were not responsive to the application of N fertilizer, both the dosage and the application interval. The morphological characters of the plants are more affected by the genetic and environmental conditions of each variety used, as well as the physiological characters, while the interactions between the varieties and the application of N fertilizers did not show a significant response to the yields.
Keyword: genetik, hasil tanaman, kualitas biji, nitrogen

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4