Judul: Pengaruh Pemberian Pupuk Organik Daun Lamtoro (Leucaena leucocephala) terhadap Pertumbuhan Bibit Serai Wangi (Cymbopogon nardus)
Abstrak: Pupuk organik daun lamtoro dapat menggantikan pupuk anorganik untuk tanaman serai wangi sehingga bisa menurunkan biaya produksi. Penelitian ini bertujuan: (1) Menganalisis pengaruh pemberian pupuk organik daun lamtoro dengan cara ditabur, dibenamkan, dan dikomposkan terhadap pertumbuhan tanaman serai wangi (2) Menganalisis cara pengaplikasian pupuk organik daun lamtoro yang paling baik terhadap pertumbuhan tanaman serai wangi. Metode yang digunakan dalam penelitian ini yaitu Rancangan Acak Lengkap (RAL) dengan 1 faktor dan 4 perlakuan yaitu perlakuan kontrol, pupuk kompos daun lamtoro, pupuk daun segar ditabur, dan pupuk daun segar dibenamkan. Masing-masing perlakuan terdapat 5 ulangan sehingga terdapat 20 bibit yang diamati. Hasil penelitian menunjukkan bahwa perbedaan cara pemberian pupuk kompos daun lamtoro tidak berpengaruh nyata terhadap tinggi tanaman serai wangi, namun berpengaruh nyata pada diameter tanaman, jumlah helai daun, jumlah anakan, berat basah daun dan akar, serta berat kering daun dan akar. Pupuk kompos daun lamtoro memberikan pengaruh terbaik terhadap pertumbuhan tanaman serai wangi.
Keyword: agroforestry, citronella, compost fertilizer, essential oil, lamtoro

Judul: Pemanfaatan Kompos Organik untuk Pertumbuhan Semai Lamtoro (Leucaena leucocephala) dan Sorgum (Sorghum bicolor L.) di Lahan Persemaian Maubara, Kabupaten Liquisa Timor Leste
Abstrak: Agroforestry between sorghum (Sorghum bicolor L.) and lamtoro (Leucaena leucocephala) need an additional compost to preserve land fertility. Compost is an organic material which is an important soil amendment for plant growth. Compost improves a soil structure by improving soil organic material content and improves soil capacity in soil water content. Beneficial microbial activity will be improved with additional compost. Improvements of soil physical condition as one of necessity to return the land that were damaged. This research aims to measure the effect of compost fertilizer towards lamtoro growth and sorghum in dry land. The experimental design used for this research was Completely Randomized Block Design (CRBD) of single factor with dose of compose 0 ton/ha (control), 4 ton/ha and 8 ton/ha in three replicates and 100 m² as the experimental unit of research area. The effect of fertilizer dosage towards height plant, plant diameter, seeds weight, leaf weight of sorghum and lamtoro were measured. Various respons were obtained due to climate factor, soil factor and plants. The effect of fertilizer dosage to height, diameter of lamtoro and sorghum was observed during 3 months. Fertilizer dosage treatment 0 kg/100 m² gave 121.7 cm, 40 kg/100 m² gave 119.37 cm and 80 kg/100 m² 119.90 cm for height of lamtoro. Base on this research, it was known that utilization of fertilizer at dosage of 8 ton/ha was the most excellent respons than the dosage of 4 ton/ha and 0 ton/ha.
Keyword: Bogor Agricultural University (IPB), organic compost and sorghum, lamtoro seedling

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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