Judul: Added single culture of Arbuscula Mychoriza Fungus (AMF) on salinity condition with zeolite medium to lamtoro (Leucaena leucocepha/a) on production and growth.
Abstrak: The research was aimed to find out the interaction effect of soil salinity and Mychoriza on early growing stage of lamtoro and the best isolat on salinity level. The research was carried out on June unti11 October 2002, in green house noA, Soil Science Department, Agricultural Faculty of Bogor Agricultural University. Completely Randomized Design with 3 x 4 factorial pattern was used in this research with 3 replications. First factor (A) two level of salinity 0 ppm and 5000 ppm, while the second factor (B) was four different arbuscula mychoriza fungus types A == control, B := Glomus sp, C = Gigaspora sp, D = Acaulospora sp. The results showed that salinity affect significantly (P<O.01) on vertical height, stem diameter, and number of branches. The effect of AMF isolate and the interaction between AMF isolate with the salinity levels did not affect vertical height, stem diameter, and number of branches. The salinity levels affect significantly (P<O.Ol) root dry matter weight and shoot dry matter weight. while using the AMF isolate affect significantly (P<O.Ol) shoot dry matter weight but did not affect on root dry matter weight. The interaction between salinity levels with AMF isolate did not significant affect root dry matter weight and shoot dry matter weight. The salinity, AMF and the interaction did not affect significantly root infection percentage. The salinity levels and AMF affect significantly (P<O.Ol) number of spores. Lamtoro growth well on media without salin and the use of AMF was not effective, because the AMF did not yet adapt well. Acaulospora sp was the best isolate used in this study. Key Words: Salicity, Zeolite, Arbuscula Mychoriza Fungus (AMF), Lamtoro.
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Judul: Pemanfaatan Fungi Mikoriza Arbuskula dan Arang Tempurung Kelapa Untuk Meningkatkan Pertumbuhan Semai Gmelina dan Balsa
Abstrak: Latosol has spread quite widely in Indonesia, but this soil was very old so that have low soil fertility. The success rate of planting in latosol can be support by species selection and high quality seedling. The one way to improve seedlings quality is the application of arbuscular mycorrhizal fungi (AMF) and coconut shell charcoal. The research was conducted in a greenhouse used split plot design with a completely randomized design. The combination of the best interactions on seedling quality index on G. arborea seedling shown by AMF type was Gigaspora sp. without the addition of charcoal was 14.87. While the combination of the best interactions on seedling quality index on O. bicolor seedling shown by AMF type was Glomus sp. with the addition of charcoal 20% dose was 0.04. In general, inoculation of Gigaspora sp. provided better response than inoculation of Glomus sp. and was not inoculated (control)
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Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix