Judul: Isolasi dan seleksi mikrob tanah yang menguntungkan serta pengaruhnya terhadap tanaman caisin (Brassica parachinensis)
Abstrak: Indonesia has soil that is very potential to be explored its microbe. Unfortunately the researchs in regards to the total, type, and the diversity of soil microbe are still rare. Hence the major part of soil miciobe is beneficial to the plant growth and it is required in the sustainability of nutrient cycling process in the nature. LnocuIation of soil microbe is expected to assist enhancing the availability of soiI organic matter and at the end will improve plant growth. This research was aimed to get the best microbe isolates and to study their impact on the growing of caisin plant (Brnssicn pnvnchirzensis). Soil samples for microbe isolation were taken fiom two locations namely Cugenaltg and Cikabayan. There were ten best isolates namely: two isolates of phosphate solubilizing bacteria (BF63 and BF223), two isolates of phosphate solubilizing fungi fFF23 and FF51), two isolates of Pseudomonas (P83 and PI 13), and four isolates of ceIlulose degradation microbe (S31, $33, S52, and S133). All of the ten isolates plus one comparison isolate and co~~txoaft the end were inoculated to the caisin plant. This resemch used Con~plete Random Design (RAL) with 24 treatrneilts, substantially microbe treatment with the full fertilizer dosage and microbe treatment with half fertilizer dosage. The entire treatments were repeated thee times so these were 72 experimental units.
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Judul: Pengaruh Pemberian Biosoil terhadap Sifat Kimia  Tanah serta Pertumbuhan dan Produksi Tanaman  Caisim (Brassica chinensis)
Abstrak: Several methods are able to increase soil productivity. One of them is biosoil (a soil conditioner with contains 8 % of humic acid extracted from leonardite). Biosoil plays important role in improving physical, chemical and biological properties of soil. The application of the substance increases soil fertility thus increases fertilization efficiency. Greenhouse experiment was conducted using Latosol from Darmaga. The aim of this research was to evaluate effect of biosoil on chemical properties of soil as well as the growth and yield of caisim (Brassica chinensis). The experiment consisted of 5 treatments and 3 replications, and was arranged in completely randomized design. The treatments applied biosoil 0, 25, 50, 70, 100 l/ha which equivalent to 0, 0.06, 0.13, 0.19, 0.25 ml/pot. Fertilizers applied were 500 mg/pot urea, 375 mg/pot SP36 and 250 mg/pot KCl. The result of experiment indicated that the effects of biosoil on available P and K and soil pH and CEC were not significant. On the other hand, the effect of biosoil on exchangeable Al was significant. Increasing exchangeable Al and low soil pH after application of biosoil caused caisim did not respond to biosoil application. Increasing dosage of biosoil tended to decrease wet and dry bweight of plant. In addition, the effect of biosoil on P and K contents of plant were not significant,while on N content was significant.
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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