Judul: Analisis Keragaman Morfologi Koleksi Tanaman Kopi Arabika dan Robusta Balai Penelitian Tanaman Industri dan Penyegar Sukabumi
Abstrak: Coffee (Coffea sp.) is one of the plantation plant which have become commodities that counts in national income strengthening. This study aimed to identify and analyze the morphological diversity characters of arabica and robusta coffee genotypes collection in Sukabumi Industrial and Freshener Crops Research Institute. The experiment was conducted by characterization of 11 genotypes the coffee using a descriptors list which have been modified for the coffee plants. Most of the quantitative data were analyzed by analysis of covariance and others analyzed by analysis of variance. Qualitative and some of quantitative data were analyzed by analysis of quantitative data to get a dendogram clusters. The results of the morphological identification of arabica and robusta coffee plant showed some real differences between the genotypes both the variables that can be combined or can not be combined. The results of the dissimilarity relation dendogram shows the level of the coffee plant arabica and robusta coffee kinship approximately 0.45 (45%) of the observed variables. Robusta coffee has a higher level of similarity than arabica coffee.
Keyword: Bogor Agricultural University (IPB), genotypes, dendogram, covariance, clusters, characterization

Judul: Analisis Stabilitas Morfologi Tanaman Kopi Robusta Menggunakan Metode AMMI pada Data Multilokasi
Abstrak: Produktivitas tanaman kopi di Indonesia masih jauh dibawah potensi. Hal itu terjadi karena penggunaan bibit yang bukan berasal dari klon unggul dan kemampuan adaptasi tanaman berdasarkan lokasinya. Salah satu cara yang dapat dilakukan untuk meningkatkan produktivitas tanaman kopi adalah dengan melakukan seleksi klon. Tujuan dari penelitian ini adalah mengidentifikasi klon kopi robusta yang stabil, spesifik, dan unggul pada percobaan multilokasi menggunakan analisis AMMI (Additive Main Effect and Multiplicative Interaction) berdasarkan metode range equalization. Data yang digunakan adalah data terkait karakter morfologi yaitu tinggi tanaman, panjang daun, dan lebar daun tanaman kopi robusta. Tujuh klon kopi robusta diuji dan ditanam di empat lokasi, yaitu di Sukabumi, Temanggung, dan dua lokasi di Lampung. Rancangan percobaan yang digunakan adalah rancangan acak kelompok lengkap dengan tiga ulangan. Hasil penelitian ini menunjukkan bahwa berdasarkan respon gabungan, terdapat dua klon stabil yaitu klon BP 534 dan klon R1 (R2017-1). Selain sebagai klon stabil, klon BP 534 juga merupakan klon unggul yang direkomendasikan untuk ditanam di semua lokasi percobaan, sedangkan klon spesifik atau klon dengan hasil rataan respon yang tinggi adalah klon BP 939 yang lebih baik ditanam di Edufarm Lampung dan klon R2017-2 yang lebih baik ditanam di Kebun Percobaan Pakuwon Sukabumi., The productivity of coffee plants in Indonesia is still far below its potential. This was due to the use of seeds that did not come from superior clones and the adaptability of plants based on their location. One way to increase the productivity of coffee plants is to do clone selection. This study aimed to identify stable, specific, and superior robusta coffee clones in multi-location trials using AMMI (Additive Main Effect and Multiplicative Interaction) analysis based on the range equalization method. The data used are morphological character data, namely plant height, leaf length, and leaf width of the robusta coffee plant. Seven robusta coffee clones were tested and planted in four locations, namely in Sukabumi, Temanggung, and two locations in Lampung. The experimental design used was a complete randomized block design with three replications. The results of this study indicate that based on the combined response, there are two stable clones, namely clone BP 534 and clone R1 (R2017-1). Apart from being a stable clone, BP 534 clone is also a superior clone which is recommended for planting in all experimental locations, while a specific clone or clone with a high response rate is BP 939 clone which is better planted in Edufarm Lampung and clone R2017-2 which is more well grown in the Sukabumi Pakuwon Experimental Garden.
Keyword: AMMI, klon, kopi robusta, multilokasi, range equalization

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