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: The Influences of VesicularArbuseular Mycorrhizas (VAM) (Glomus sp, Gigaspora sp. and Acaulospora sp.) Mixing Culture to Leucaene leucocephala Growth in Zeolit Media with Different Level of Salinity.
Abstrak: Vesicular-arbuscular mycorrhizas (VAM) is a root infected fungi but did not damage the host plant. Mycorrhiza can be detected by hyphae that infected root. Mycorrbiza has important roles in plant growth. VAM is very effective in absorption of organic substance including macro and micro nutrient and improve plant immunity from pathogenic microorganism. The present study was undertaken to investigate maximum salinity level to mycorrhiza isolate and to find out the best isolate mixing culture. Leucaena leucocephala that one of feed source was used as a host plant.
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Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf