Judul: Pengaruh dosis bahan organik dan pupuk N, P, K terhadap serapan hara dan produksi tanaman jagung dan ubi jalar di inceptisol Ternate
Abstrak: The objective of the research was to study the effects of organic matter and N, P, K fertilizer on nutrient uptake and yield of corn and sweet potato in Inceptisol Ternate. The design of the research was factorial completely randomized block design with two factors. The first factor was the rate of organic matter (0, 20, 40 t/ha) or (B0, B1 and B2) and the second factor was the rate of N, P, K fertilizer (0,5 ; 1 and 1,5 recommended dosages) or (F1, F2 and F3). The results of research showed that combination of B1F2 was significantly increased and gave the highest amount of the corn leaf at 42 DAP and spiraling upward of potatoes at 42 DAP (in sweet potato planting), the weight of corn with husk cover, the weight corn grains, and K-availability of soil in corn planting. Whereas the rate of 20 t/ha organic matter (B1) was significantly increased and gave the highest weight of corn without husk cover, NPK corn plant content and P uptake in corn planting, and weight of sweet potatoes, P plant content and soil K availability in sweet potatoes planting. However, the dosage of F2 fertilizer was significantly increased and gave the highest to NK plant content of sweet potatoes and P-availability of soil in sweet potatoes planting. The average NPK plant uptake of corn was 31,41-39,39 kg N/ha, 6,03- 12,54 kg P/ha, 37,5-41,70 kg K/ha, and NPK plant uptake of sweet patatoes were 20,38-28,68 kg N/ha, 7,45-12,90 kg P/ha dan 27,84-36,08 kg K/ha. The average production of corn was 5,16-7,83 t/ha and sweet potatoes was 8,90-15,35 t/ha.
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Judul: The Effect of Combination B and NPK Fertilizer on the Growth of Swet Corn and Some Nutrients in Darmaga Inceptisols
Abstrak: Tanah-tanah di daerah tropik memiliki kadar B total dan tersedia yang rendah. Intensifikasi produksi dalam jangka panjang berpotensi menyebabkan defisiensi B dan penurunan produktifitas jagung manis. Penelitian ini bertujuan untuk mengetahui kadar B tersedia tanah dan kadar B daun, N-total, P-total dan tersedia serta K-dd dalam tanah. Rancangan percobaan menggunakan Rancangan Fraksional Acak Kelompok non faktorial dengan delapan perlakuan yang terdiri dari kontrol (B0S0), standar (B0S1), B1S1, B2S1, B3S1, B1S2, B2S2, dan B3S2 dengan empat ulangan sehingga terdapat 32 satuan percobaan. Pupuk kandang dan kapur sebagai pupuk dasar diberikan ke seluruh petak satu minggu sebelum tanam. Hasil penelitian menunjukkan bahwa kombinasi pupuk B dan NPK tidak signifikan dalam meningkatkan kandungan P-total dan tersedia, K-dd dalam tanah, kadar B daun, dan pertumbuhan jagung manis. Namun signifikan meningkatkan kadar B tersedia tanah, N-total, dan mempercepat menculnya bunga jantan (tasseling). Perlakuan B1S1 dengan dosis pupuk B = 9 kg/ha dan NPK = 300 kg/ha optimal dalam menunjang pertumbuhan dan mempercepat fase pembungaan jagung manis., Soils in tropical climates have low total and available B content. Intencification of production on the long term, potentially cause B deficiency and decreasing the productivity of sweet corn. This study aims to determine the content of available B in soil and B in leafes, total-N, total and available P, and exchangeable Potassium in the soil. The experimental design used non-factorial Randomized Fractional Design with eight treatments consisting of control (B0S0), standard (B0S1), B1S1, B1S1, B2S1, B3S1, B1S2, B2S2, and B3S2 with four replications so there were 32 experimental units. Manure and lime as basic fertilizers were applied to all plots one week before planting. The results showed that the combination of B and NPK fertilizers were not significant in increasing the total and available P content, exchangeable Potassium in the soil, content of B in leafes, and the growth of sweet corn. However, it’s significant in increasing the available B content in the soil, total-N, and accelerate the appearance of male flowers (tassel). B1S1 treatment with a dose of fertilizer B = 9 kg/ha and NPK= 300g/ha is optimal in supporting growth and accelerating the flowering phase of sweet corn.
Keyword: Availability, boron, deficiency, soil parameters, sweet corn

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. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.