Judul: Analisis Pendapatan dan Faktor Penentu Adopsi Teknologi PHSL (Pemupukan Hara Spesifik Lokasi) untuk Usahatani Padi (Studi Kasus di Desa Jembungan, Kecamatan Banyudono, Kabupaten Boyolali, Jawa Tengah)
Abstrak: The highly increase of crop production in the future will be a compulsion and utilization of field will be more intensive. Therefore, precise pescription of crop fertilization is required. Site Specific Nutrient Management (SSNM) application is an innovation of technology for rice farming through fertilization recommendation which accurate in type, dose and time of fertilization to increase rice production and farmer incomes. SSNM application was developed by IRRI (International Rice Research Institute) in Philippines.The aim of this research is to get illustration about analysis of farmers on new technologies SSNM application of web-based technology. Comparing farm income and productivity of rice farmers using the technology by not using technology SSNM. Identifying factors that influence farmers to adopt SSNM applications. There was a significant differences in fertilization cost between the usage of SSNM and manually applied fertilization. In manually applied fertilization costs Rp 320,065 or about 20.62 percent of total cost, while in SSNM fertilization costs only12.93 percent of total cost or Rp 23,078. The application of SSNM was able to increase average rice production about 314.38 kg / hectare and farmers income raised to Rp 1,100,328 / hectare. There is a driving factor for farmers to use the SSNM application including increased production, the facilities, the capital, the efficient use of fertilizer and maintain the field quality.Farm rice incomes and field ownership have positive relationship toward farmer to adoption SSNM application.
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Judul: Analisis Pendapatan Usahatani dan Faktor-Faktor yang Mempengaruhi Produksi Padi Hibrida dan Inbrida (Studi Kasus Desa Suru, Kecamatan Doko, Kabupaten Blitar, dan Desa Clumprit, Kecamatan Pagelaran, Kabupaten Malang, Jawa Timur)
Abstrak: Food is a one of based necessary that must be completed by human. One of food that being a main necessary for Indonesia people is rice. In a row of total society improvement, necessary of rice will grow every years. Rice demand in Indonesia can not be completed all by a rice production in Indonesia. This problem make a goverment take a policy by making rice import in short term and innovation utilize of hybrid seeds for improving a rice production in long term. Blitar and Malang district were areas which have a wide land of hybrid rice at East Java. Suru Village - Doko sub district and Clumprit village - Pagelaran sub district were have hybrid rice land. First purpose of this research was to analyze the characteristic of hybrid and non-hybrid rice for agricultural business which use by farmers at Suru Village and Clumprit Village with descriptive analysis. Second purpose of this research was to analyze income rate of farmers which use hybrid and non-hybrid rice at Suru Village and Clumprit Village by using π = TR-TCdan R/C ratio method. Based on this research the farmers of hybrid rice get a higher income rather than farmers of non-hybrid rice. The business of hybrid and non-hybrid rice agriculture were suitable to do because R/C ratio of agricultural business based on total cost and cash cost were higher than one. Third purpose of this research was to know about factors that influenced hybrid and non-hybrid of rice production at Suru Village and Clumprit Village by using a linear regression. Based on result, factors that influenced rice production were seeds, organic fertilizer, solid pesticide, labour, and production difference between hybrid rice and non-hybrid rice.
Keyword: rice income, production, non-hybrid rice, hybrid rice

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf