Judul: Pengaruh pemupukan fosfor dan kalsium terhadap serapan hara dan produktivitas dua genotipe kedelai pada budidaya kering dan jenuh air
Abstrak: The objectives of this research were to study the effect rates of P and Ca fertilizers on productivity and nutrient uptake of two soybean genotypes in dry culture and saturated soil culture, and to compare the nutrient uptake and productivity in soybean dry culture with saturated soil culture. The experimental design was split split plot with three factors i.e. phosphorus, calcium and genotype planted in dry culture and saturated soil culture. Dry culture with phosphorus fertilizer application (72 kg P2O5/ha) increases the number of filled pods and grain weight per plot. Number of pods of Tanggamus variety was greater than Anjasmoro variety. Liming had no effect on productivity. Path analysis showed that largest direct effect to grain weight were plant height and leaf weight. Increased rate of P and Ca fertilizer increased the uptake of P and Ca, but variety Tanggamus is more responsive than variety Anjasmoro. Saturated soil culture with phosphorus fertilizer (72 kg P2O5/ha) and lime (1 ton/ha) increased the number of pods content and grain weight per plot. Variety Tanggamus had higher number of pods and grain weight per plot than variety Anjasmoro. Interaction of phosphorus fertilizer 72 kg P2O5/ha with lime 1 ton/ha increased grain weight per plot. Largest direct effect on increasing grain weight is plant height and the number of branches. Phosphorus application (72 kg P2O5/ha) and liming (1 ton/ha) also give highest uptake of P and Ca. Saturated soil culture technology can be applied to increase soybean nutrient uptake and productivity than dry culture.
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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: 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