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: Aspek biologi dan genetika pada sistem reproduksi mindi (Melia azedarach Linn.)
Abstrak: The study was aimed to determine biological and genetical aspects of reproductive system of mindi in relation to securing high quality of seeds. The study was conducted at four sites in West Java for the periods of 2009-2011. Direct observation over the trees (n=5-20 trees) were conducted on the periods of flowering and fruiting as well as floral morphology. Representative buds, flowers and fruits were sampled for microscopic dissection and reproductive study. The level of genetic diversities of maintained parental and produced offspring were evaluated either phenotipically or genotipically. Molecular characters were determined by using microsatellite markers. The genotipe deviation was evaluated based on Hardy-Weinberg and inbreeding structures. The observation revealed that floral initiation had proceeded for more than three months and the highest percentage of floral initiation occured in September. Reproductive cycle was proceeded for 5-6 months within the year, first observation commenced from generative buds to flower burst in September-October. Fruits reached maturity in January-February that took about 2-3 months after flower burst. The flower was hermaphroditic with position of anther was closed to stigma that selfing might be happened. Stigma receptivity lasted from 08.00 am to 11.00 am, rate of receptif was 66% in average, at 12.00 the receptivity was decreased to 40% and pollen viability was fluctuated from 4,89%-7,03% observed from 07.00 am-11.00 am. Controlled pollination exposed that mindi could be able to do both of cross- and self-pollination with the percentage of fruit set ranged of 70-77% and 42-57%, respectively. The genetic variation of mother trees and progenies for all loci and population were at range of 0,49-0,51 and 0,288-0,426, respectively. Genotipe deviation in progeny was detected at a small part of loci in two population with an average fixation index of -0,0680 and thus inbreeding might have been occured in a mating system of mindi in a low level. Assortative mating was detected in a very low degree. Three characters of seedling growth i.e length of bud, length of petiole and ratio of petiole to leaf length, might have to be used as keys to effective indicator for seedling selection.
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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