Judul: Perancangan sistem pakar fuzzy untuk penentuan efektivitas kultivasi cendawan mikoriza arbuskula sebagai pupuk hayati, Design of Fuzzy Expert System for Determination of Cultivation Effectiveness of Arbuscular Mycorrhizal Fungi as Biofertilizer
Abstrak: The use of biofertilizer provides many benefit, including the increased of agricultural production, quality improvement of agricultural product, and reducing the use of artificial fertilizer as well. One of such biofertilizer is Arbuscular Mycorrhizal Fungi (AMF). In cultivation of AMF there are some environment factors which influence cultivation effectiveness, such as soil pH, mean temperature, soil water content, and suitability of host plant. Incompatible factor can give negative impact on AMF cultivation. This research designed an expert system to observe effectiveness value of AMF cultivation based on certain environment factor. This research focused on three AMF specieses, Entrophospora columbiana, Glomus fasciculatum, and Glomus manihotis. This system was built using Fuzzy Inference System (FIS) with four fuzzy parameters: suitability of host plant, soil pH, mean temperature and soil water content. Rules as knowledge base had been built with total 144 rules for each AMF species. Mamdani method is used as inference process. System gives cultivation effectiveness value as output. The effectiveness value shows how effective cultivation process on certain input condition as compared to its best condition. The effectiveness value also divides into four category: not effective, slightly effective, moderately effective, and effective. Based on data verification, system is still unable to gives an accurate effectiveness percentage, altough it is quite good on giving right effectiveness category. To be used in real condition, this system must still be developed further. For example by adding other factors as parameters, such as cultivation time or type of cultivation media.
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Judul: Efektivitas Fungi Mikoriza Arbuskula (FMA) dalam Memperbaiki Produktivitas Rumput Gajah (Pennisetum purpureum Schum.) Berdasarkan Periode Pemanenan
Abstrak: The use of arbuscular mycorrhizal fungi (AMF) was expected to be an alternative environmentally friendly technology and efficiency of fertilizer to increase the productivity of forage. This study was aimed to determine the level of production of elephant grass (Pennisetum purpureum Schum.) inoculated by AMF and fertilizer dose reduction based on different harvesting period. This research used Completely Randomized Factorial Design with 2 treatments and 3 replications. The first treatment was fertilizer: P0 (control), P1 (100% fertilizer dose), and P2 (50% fertilizer dose and inoculated by AMF). The second factor was the interval of harvest H30 (30th day of harvest), H50 (50th day of harvest, and H60 (60th day of harvest). Variables measured were plant height increment of each week, the production of dry weight on the first harvesting period, the production of dry weight on second harvesting period, and percent of infection AMF. It can be concluded that the P2H60 treatment with 10 grams of AMF inoculation and fertilizer dose 50% (SP36 75 kg/ha, KCl 75 kg/ha, manure 2 ton/ha, and urea 100 kg/ha) on 60th day of harvest elephant grass get the best production, either the first and second periods and more effective and efficient use of fertilizer.
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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