Judul: Pengaruh Pemupukan Fosfor terhadap Pertumbuhan dan Produksi Beberapa Varietas Kedelai Hitam (Glycine Soja) pad a Budidaya Jenuh Air di Lahan Pasang Surut
Abstrak: Saturated soil culture is a cultivation that gives continuous irrigation and maintains water depth constantly and makes soil layer in saturated condition. Technology of saturated soil culture has been shown to increase soybean production on tidal swamps. The objective of this experiment to study the effect of phosphorus fertilization on the growth and production variety of soybean under saturated soil culture on tidal swamps. The experiment was conducted at Banyu Urip, Tanjung Lago, Banyuasin, South Sumatera, Indonesia from May to September 2013. The experiment used a split plot design with three replications. The main plot of the experiment is black soybean variety consisted of : Ceneng, Cikuray, Lokal Malang and Tanggamus as control . Sub plot is the dosage of phosphorus fertilization consisted of : 0, 36, 72 and 108 kg P2O5 ha-1. The results showed that the variety and phosphorus fertilization affected soybean productivity. The highest productivity was obtained on Cikuray variety with phosphorus fertilization 108 kg P2O5 ha-1 as much as 4.03 ton ha-1.
Keyword: Tidal Swamp, Saturated Soil Culture, Phosphorus Fertilization, Black Soybean Variety

Judul: Pengaruh Pemupukan Kalium terhadap Pertumbuhan dan Produksi Beberapa Varietas Kedelai Hitam (Glycine soja) pada Budidaya Jenuh Air di Lahan Pasang Surut
Abstrak: Saturated soil culture can prevent oxidation of pyrite from negative influences and it can to improve the productivity of soybean. The objective of this experiment was to study the effect of potassium fertilization on the growth and production of Ceneng, Cikuray, Lokal Malang, and Tanggamus under saturated soil culture on tidal swamp. The experiment was conducted at Banyu Urip, Tanjung Lago, Banyuasin, West Sumatera, from May until September 2013. The experiment used split plot design with 3 replications. The main plot was is variety consisted of Ceneng, Cikuray, Lokal Malang, and Tanggamus. The sub plot was is potassium fertilization consisted of 0, 30, 60 and 90 kg K2O ha-1. The experiment results show that kalium fertilization increased yield of black soybean. Productivity was affected by single factors that is variety and potassium fertilization. The interaction between variety and potassium fertilization did not effect to the all variables. The highest productivity of black soybean was obtained from Ceneng variety, 3.58 ton ha-1. The potasium fertilization 90 kg ha-1 gave the highest productivity as such as 3.72 ton ha
Keyword: saturated soil culture, potassium, Lokal Malang, Cikuray, Ceneng

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