Judul: Utilization of empty fruit bunches and bunch ash oil palm as ameliorant on oil palm (Elaeis guineensis Jacq) seedling growth in main nursery
Abstrak: The objective of the research was to identify the effect of ameliorant to the oil palm seedling growing in main nursery. This experiment was conducted at IPB Experimental Station Cikabayan (Plantation Teaching Farm), Dramaga, Bogor in 250 m above sea level, from November 2011 to May 2012. The experiment was arranged in a randomized block design with seven treatments and six replications. The treatment consist of P1 : Urea 22 g, SP36 15 g and KCl 17,5 g per seedling. P2 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches per seedling. P3 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg bunch ash per seedling, P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1kg bunch ash per seedling, P5:1 kg empty fruit bunches + 1 kg bunch ash per seedling, P6:1 kg empty fruit bunches per seedling and, P7:1 kg bunch ash per seedling. The result of the experiment showed that the treatment of P1 : Urea 22 g, SP36 15 g and KCl 17,5 g. P2 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches. P3 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg bunch ash, P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1 kg bunch ash having the same affect to the vegetative growth as height respectively, 90,16 cm, 88,03 cm, 87,90 cm and 89,68 cm. The treatment of doses of P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1 kg bunch ash, affected to the plant dry weight, roots dry weight respectively 32 % and 36,61 % compare to P1, P2, P3, P5, P6 and P7.
Keyword: 

Judul: Optimizing of fertilizer nitrogen and phosphorus doses for oil palm seedling (Elaeis guineensis Jacq.) in Main Nursery
Abstrak: The objective of this experiment was to study the optimum doses fertilizer of Nitrogen and Phosphorus for oil palm seedling (Elaeis guineensis Jacq.) in main nursery. This experiment was carried out at IPB Experimental Station (Plantation Teaching Farm),Cikabayan Dramaga, Bogor, from November 2011 to May 2012. The treatment was laid-out in a factorial randomized block design with three replications. The first factor was N i.e. 0, 8.51, 17.02, and 34.04 g N.plant-1 and the second was P i.e. 0, 2.28, 4.56 and 9.12 g P.plant-1. The result of the experiment showed that vegetative growth increased with fertilizer application. The height and leaf area of plant are affected by interaction between N and P significantly. The total leaf number and steam diameter increased quadratically with fertilizer rate of N and application of P increased linearly. Base on the height of plant and leaf number, optimum recommendation rate of N for oil palm seedling during six months in main nursery is 21.99 g N plant-1, by aplication every month i.e. 1.60, 1.14, 2.80, 4.01, 5.73 and 5.74 g N plant-1.month-1. Optimum recommendation rate of P is 4.24 g P plant-1 by aplication every month i.e. 0.22, 0.44, 0.76, 0.18, 0.94, and 1.70 g P.plant-1.month-1. The seedlings that resulted from experiment could be requisite accomplished to used on commercial planting.
Keyword: 

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