Judul: Litterfall Production and Semi Aerobic Decomposition of Leaf Mahogany (Swietenia macrophylla King).
Abstrak: Mahogany (Swietenia macrophylla King) is one of the most valuable tropical tree in the world, due to their potential use in the development of artificial forest such as a forest city. Mahogany trees produced enough litter, however the litter was not used maximally. These litter can be used as a compost fertilizer after composting decomposition. This research aims were to assess the productivity of litter mahogany, to evaluate the effect of leaf size mahogany and addition of EM4. Mahogany litter productivity was measured using litter-trap method. Litter leaf fall was trapped by 1m x 1m sample plot. There were 24 sample plots placed under mahagony stands. The plot height was 50 cm above the soil surface. Semi aerobic decomposition was set up in bucket with nets. The cover of the bucket had 3 holes with a diameter of 2 mm for air ventilation and maintaining moisture. Temperature and pH were monitored weekly. The experiment was set up with two factors completely randomized design. The first factor was the size of litter with 3 different sizes i.e. 25-30 cm2 (P1), 7-10 cm2 (P2) and 0,7-1 cm2 (P3). The second factor was microbes (EM4) addition with 3 different volume i.e. 5 ml (K1), 10 ml (K2) and 20 ml (K3). The microbes (EM4) was prepared with 100 g of sugar in 1 liter water. Data were analyzed using the F test at the 95% confidence level. If there was significancy, then continued with DMRT. Enumeration of bacterial groups was conducted using 4 selective media i.e. MRSA media for Lactobacillus sp, SCA for Actinomycetes sp, sistrom’s media for photosynthetic bacteria, and PDA for yeast. Productivity of litterfall was determined from the average of collected litter. The reduction rate of semi aerobic litter decomposition were used to show the decomposition rate. Total concentration organic carbon, nitrogen, phosphate and potash were analised at the end of experiment. The results showed that the highest litter productivity of mahogany at sixteen weeks of composting periode, it was 89.24 g/m2/week in May-June (the dry season). The highest litter productivity was found in tree no 2 (with 33 cm in diameter, 20 m in height, and 5.5 m crown thickness). Total productivity was 1415 g/m2/week. The results showed that P3K2 treatment was the most efficient decomposition process, it was shown at seven week of composting periode. This treatment was combination of 0.7-1 cm2 litter size and addition of 10 ml EM4.
Keyword: Litterfall production of mahogony, semi aerobic decomposition

Judul: Forest Carbon Storage Estimation at the Top of Mahogany (Swietenia macrophylla) at Plot 30 BKPH Pandeglang
Abstrak: BKPH Pandeglang merupakan salah satu dari 8 Bagian Kesatuan Pemangkuan Hutan (BKPH) yang berada di KPH Banten. Nilai karbon hutan yang didapat dari setiap daerah umumnya bebeda-beda. Penelitian ini bertujuan untuk menghitung potensi simpanan karbon di atas permukaan tanah pada Petak 30 BKPH Pandeglang serta menganalisis kesesuaian lingkungan tumbuh terhadap pertumbuhan tegakan mahoni. Hasil penelitian menunjukkan nilai rata-rata biomassa bagian atas tegakan mahoni di Petak 30 BKPH Pandeglang sebesar 335,18 ton/ha sehingga nilai simpanan karbon yang didapat sebesar 157,53 ton/ha. Nilai biomassa dan karbon dipengaruhi oleh kerapatan vegetasi dan juga kondisi lingkungan dari tempat tumbuhnya. Kondisi lingkungan penelitian memiliki kesesuaian untuk tempat tumbuh mahoni yaitu dengan suhu berkisar antara 21-24˚C, curah hujan 1780 mm/tahun dan ketinggian tempat 1400 mdpl. Kondisi lingkungan yang cocok sebagai tempat tumbuh mahoni ini yang menjadi salah satu penyebab nilai biomassa dan simpanan karbon yang didapatkan tinggi., BKPH Pandeglang is one of 8 Forest Management Units (BKPH) located in KPH Banten. Forest carbon values obtained from each region are generally different. The study aimed to calculate the carbon storage potential of the upper part of mahogany stands in Plot 30 BKPH Pandeglang and analyze the suitability of the growing environment for the growth of mahogany stands. The results showed that the average value of biomass at the top of mahogany stands in Plot 30 BKPH Pandeglang was 335.18 tons/ha so that the carbon storage value obtained was 157.53 tons/ha. The value of biomass and carbon is influenced by the density of vegetation and also the environmental conditions of the place where it grows. The environmental conditions of the study are suitable for growing mahogany with an around temperature of 21-24˚C, rainfall of 1780 mm/year and an altitude of 1400 meters above sea level. This suitable environmental condition as a place to grow mahogany is one of the causes of the high biomass and carbon storage values obtained.
Keyword: biomass, BKPH Pandeglang, carbon storage, environmental conditions, mahogany

Judul: Kriteria Osilasi Untuk Pertidaksamaan Diferensial Taklinear Orde Dua
Abstrak: dimana pertidaksamaan dibatasi pada suatu selang [T,oo) dengan T?:O, aCt) kontinu pada selang [0,00) dan j(u) mempunyai turunan pertarna yang kontinu pada selang (-00,00) dengan uj(u) >0 untuk u;"O. Dengan menggunakan Asumsi A dan Asurnsi B, diperoleh beberapa teorerna ten tang kriteria osilasi untuk pertidaksamaan diferensial taklinear orde dua.
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