Judul: Relationship Between Fruit Yields of Melia azedarach L. and Environmental Factors in Community Forest of West Java
Abstrak: The main objective of the study was to determine relation between site condition of mindi seed stands and fruit yields for two consecutive years (2009-2010). Specifically, the study was aimed at i) estimating fruit yields of mother trees in the seed stand and ii) determining site condition in the respective seed stands. The study was conducted in five seed stands of mindi located in West Java. Fruit yields were estimated based on observation of 20 mother trees in each seed stand, while soil properties were determined by routine sampling procedures for soil analysis. Results of the study showed that the highest average fruit yields was observed in Legok Huni village, Purwakarta district (9.9 kg/tree/year), while the lowest was found in Mekarsari village, Bandung district (3.1 kg/tree/year). In general, tree dimension, i.e. diameter and height, did not influenced average fruit yields. However, it was found in a location, that diameter alone influence the fruit yields (R2=0.515) namely in seed stand of Babakan Rema village, Kuningan district. With respect to site condition, it was found that K, P, %Clay, Cation Exchange Capacity, rainfall, temperature, relative humidity, age of stand and density had significant influences on fruit yields. Findings of the research may be used to formulate the site suitability clasification for future seed stand development.
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Judul: Strategi pengembangan sumber benih mindi (Melia azedarach L.) pada hutan rakyat di Provinsi Jawa Barat
Abstrak: Melia azedarach L. or mindi (local name) is one of the widely planted exotic species in Indonesia, mostly found in community forests in West Java. It is still an urgent need for improvement of mindi plantation productivity, especially in community forest in West Java. One of the factors that affect forest productivity is high quality seed, but seed quality is not easily obtained by farmers. For this it is necessary to carry out a strategies which can support the development of seed sources in the community forest. The general objective of this research is to formulate development strategies of mindi seed sources in the community forest in West Java, while specific purposes of this study are to (1) determine the genetic and morphology diversity of mindi in the community forest in West Java, (2) improve seed pre-treatment to develop the seed viability of mindi, and (3) analyze of socio-economic and institutional aspect of farmers, to support the development of the seed sources. Six populations of mindi plantation in the community forests were chosen for this research. i.e Nagrak village (Bogor); Megamendung (Bogor); Hamlet of Gambung (Bandung); Wanayasa subdistrict (Purwakarta); Padasari village (Sumedang) and Babakan Rema village (Kuningan). RAPD markers were used to assess the genetic variation, while various pre-treatments employing chemical and physical methods were tested to improve seed viability and vigor. SWOT analysis was used to evaluate the capacity of farmers in developing seed source. The results showed that the genetic variation of mindi in community forests in West Java was moderate ranging from He = 0.1603-0.1956. With respect to seed treatment, the use of sulfuric acid (95%) increased the viability of seed by 57% over control, especially seed from Padasari (Sumedang) population. Prospective populations to be developed for seed sources were proposed namely Padasari (Sumedang) and Legok Huni (Purwakarta). Evaluation of socio-economic and institutional aspect in these two location showed that generally farmers have the sufficient capacity to manage community forests. Four strategies that can be used to develop seed sources of mindi in community forest in West Java : i.e 1. The strategy based on utilization of plant genetic resources of mindi to increase seed production in order to meet the need of mindi timber market. 2. The strategy based on market and networking opportunities to improve the quality of mindi seeds . 3. The strategy based on capacity building and institutional development of farmers in the cultivation of mindi. 4. The strategy based on increasing farmers' interest in cultivation of mindi In conclusion, effective strategy of mindi seed source development should emphasize following important considerations such as the utilization of exisiting genetic resources, enhancement of institutions and networks as well as optimizing opportunities in mindi timber markets.
Keyword: Benih Mindi, Melia azedarach L., Hutan Rakyat, Jawa Barat

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