Judul: Pengaruh Varietas dan Kombinasi pupuk terhadap Pertumbuhan dan Produktivitas Kedelai pada Budidaya Jenuh Air di Lahan Pasang Surut
Abstrak: The problems on tidal swamps are a condition of stress by Al-ex, Fe-ex and soil acidity. This condition decreased of soil nutrient availability. The utilization tolerant varieties and fertilizer combination under saturated soil culture technology has been proved to increase soybean productivity on tidal swamps. Saturated soil culture technology is a cultivation that gives continuous irrigation and maintains water depth constantly, as a result soil layer in saturated condition. This study aims to determine the tolerant of soybean variety and the best fertilizer combination under saturated soil culture on tidal swamps. The experiment was arranged in a split-plot design with three replications. The main plots was 4 kind of soybean variety and subplots was 10 kind of fertilizer combination. The result showed that the interaction between varieties and fertilizer combination significantly affected growth and productivity under saturated soil culture on tidal swamps. The highest productivity was obtained from Tanggamus with fertilizer combination of 200 kg/ha SP-36 + 100 kg/ha KCl + 1 ton/ha dolomite + 2 ton/ha manure, whose productivity up to 4.76 ton/ha
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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: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular