Judul: Pengambilan Keputusan Pemilihan Jenis Tanaman dan Pola Tanam di Lahan Hutan Negara dan Lahan Milik (Studi Kasus di Desa Sungai Langka Kecamatan Gedong Tataan Kabupaten Pesawaran Propinsi Lampung)
Abstrak: Agroferestry adoption studies about farmer’s decision making on tree planting have been conducted for many cases, but there was an important aspect that still had less concern about farmer views especially how they choose the plant species and planting pattern and why they do that. The aim of this study was to explain the farmer’s reasons when they choose a plant species and planting pattern with different land tenure systems, state forest and private land. Method used in this study was case study through analyzing plant species and planting pattern selection, financial flow, household revenue structure, and portfolio diversification. The results showed that: the farmer’s reasons were (1) cash income, (2) production continuity, (3) gestation period, (4) easy maintenance and harvest, (5) easy post harvest process, (6) tolerance to be planted with other plants, and (7) land tenure security (especially in state forest land); most farmers chose cacao species, with the main combination of planting pattern that consist of cacao and banana in state forest land, cacao and petai, cacao and durian in private land; all the planting pattern were financially feasible; the largest contribution was given by cacao at all planting patterns based on farmer household revenue structure, and portfolio diversification was not conducted by the farmers.
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Judul: Pemilihan Jenis  Tanaman Hutan Rakyat Di Desa Hegarmanah, Kec. Cicantayan, Kab. Sukabumi
Abstrak: Pemilihan jenis tanaman berkaitan dengan pengetahuan dan keterampilan petani dalam pengelolaan hutan rakyat. Pemilihan jenis tanaman harus melibatkan aspek ekonomi, ekologi, dan sosial-budaya. Penelitian ini menggunakan metode penelitian deskriptif kualitatif. Pengumpulan data dilakukan dengan wawancara mendalam, observasi dan dokumentasi. Petani mengelola hutan rakyat berdasarkan pengetahuan yang diperoleh dari pengetahuan lokal, penyuluh kehutanan, penyuluh pertanian, perguruan tinggi, pihak swasta, dan interaksi antar petani. Petani pada umumnya menanam sengon, suren, puspa, mahoni, kayu afrika, jati, jabon, sonokeling, gmelina, aren, bambu, manggis, durian, rambutan, duku, jambu jamaika, jengkol, dan petai. Petani memilih jenis tanaman berdasarkan faktor ekonomi sebagai faktor dominan yaitu pemilihan jenis yang cepat menghasilkan, kemudahan akses pengadaan bibit, kemudahan akses pemasaran hasil, dan kestabilan harga jual. Sub faktor sosial-budaya yang mempengaruhi yaitu pengetahuan lokal dan interaksi antar petani. Sub faktor ekologi yang mempengaruhi yaitu kesesuaian tempat tumbuh, dan kemampuan tanaman beradaptasi.
Keyword: the selections of plant, private forest, forest farmer

Judul: Peluang Partikel Plasma Berada Pada Dimensi Debye Akibat Gangguan Gelombang Elektromagnetik dengan Menggunakan Persamaan Schrödinger
Abstrak: The solution of Schrodinger equations with plasma Coulomb potential in spherical coordinat results solution wave function and energy plasma particle. Electron probability density at Debye length with thermal effect same as ion, which indicates plasma in neutral state. Electromagnetic waves perturbation of an electric field given to result wave function perturbation system. The probability density of plasma particle due to electromagnetic waves perturbation is the largest when an electromagnetic waves frequency 1.41 times the plasma frequency .
Keyword: Schrödinger, plasma, electromagnetic wave