Judul: Pengaruh Tanaman Penutup Tanah terhadap Pertumbuhan Bibit Jabon Merah (Anthocephalus macrophyllus (Roxb.) Havil.) di Persemaian
Abstrak: Cover crop is a plant that is used to control erotion on open land, such as ex-mining land. Recently, some of cover crops that available are Centrosema pubescens, Calopogonium mucunoides, Pueraria javanica, and Mucuna sp. In the generally, they are creeped and enlaced so they should be controlled intensively. Therefore it is needed to look for alternative types of cover crops, that does not disturb another plants. The aim of this research are get information about the influence of legumes cover crop and grass to the growth of red jabon, and get information about growing speed of cover crop. Based on the analysis of variance in all red jabon parameters, showed that planting red jabon with cover crop in the same polybag do not reduce of red jabon growth. Cover crop who has life ability, covered open area ability quickly, and include to the potential species is Desmodium. Desmodium has the highest percentage of life about 72%, better in the length of primary stem and total of branch than Arachis and Paspalum
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Judul: Pertumbuhan Semai Jabon (Anthocephalus cadamba Roxb Miq) Pada Media Pasca Penambangan Batubara Yang Diperkaya Fungi Mikoriza Arbuskula, Limbah Batubara dan Pupuk NPK
Abstrak: One of the problems created by coal mining activities is the progressive increase of critical land area size and environmental damage, which are among other things in the form of worsening physical, chemical and biological properties of soils which lead to decrease of soil fertility and disturbed plant growth. Growth and nutrient absorption by Jabon seedlings have been studied in terms of their respond toward application of Arbuscular Mycorrhizal Fungi (AMF), coal waste, and soil media being used after coal mining operation. The experiment was designed as factorial completely randomized design, comprising 3 treatment factors, namely, species of AMF inoculants (control, Glomus sp., and Gigaspora sp.), growth media (control, mixture of 15% south Kalimantan coal, and mixture of 15 % Jambi coal) and concentration of NPK fertilizer (control, 2 gram/polybag, and 4 gram/polybag) with 10 replications, so that in total, there were 270 experimental units. Results showed that interaction between AMF, growth media and fertilizer had significant effects on parameters of diameter increment, shoot biomass, root biomass, total dry weight, index of planting stock quality, and percent of AMF colonization. Parameter of height increment and number of Jabon seedling leaves were affected by interaction between AMF and fertilizer. Treatment combination of AMF inoculants, coal powder, and NPK fertilizer was able to increase the concentration and absorption of nutrients N, P and K. The three treatments combination showed positive correlation between increase in concentration of nutrients N, P and K; and shoot biomass of Jabon seedlings.
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Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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