Judul: Estimasi Nilai Ekonomi Air Irigasi pada Usahatani Padi Sawah di Desa Telarsari, Karawang, Jawa Barat.
Abstrak: Rice is strategic comodity for national economy in Asian countries, including Indonesia. Therefore, many farmers in Indonesia elaborate rice farming system. West Java is one of Indonesia provinces with high rice production and productivity. Karawang distric, West Java region, become the center of rice production. Rice production mainly depends on irrigation system. Irrigation system is divided into three, namely pimary, secondary, and tertiary irrigation system. Nowdays, the condition of irrigation system, especially tertiary system in Karawang distric has been damaged because of significant decrease of water supply, especially in dry season. Telarsari village is one of the villages in Karawang distric which has problem in tertiary irrigation system. The aims of this research were to estimate economic value of irrigation water in Telarsari Village, Karawang Distric, to estimate farmer’s Willingness to Pay (WTP) for recovering the tertiary irrigation system, and to analyze factors which affecting the value of farmer’s WTP of the tertiary irrigation system. The method of this research were water rent, Willingness to Pay (WTP), and multiple regresion analysis. The object for observation and interview in this research were farmers who get their irrigation water from Jatiluhur Reservoir. The result demonstrated the water rent or contribution of irrigation water was Rp 6.839.880/Ha/MT. Analysis of farmer’s willingness to pay for tertiary irrigation system recovery displayed that 100 percent of farmers respondents were agree to pay for the recovery of tertiary irrigation system. WTP’s average value of farmers respondents was Rp 143.125/Ha/MT and WTP’s total of farmer population in Telarsari village was Rp 25.171.904/MT. Other factors namely farmer’s age, the width of paddy field, and income levels significantly influenced againts farmer’s WTP value in Telarsari village.
Keyword: Willingness to Pay (WTP), water rent, irrigation system

Judul: Nilai Ekonomi Air Irigasi dalam Usahatani Padi (Studi Kasus: Desa Tinggarjaya, Kecamatan Jatilawang, Kabupaten Banyumas).
Abstrak: Air irigasi merupakan salah satu komponen penting dalam kegiatan usahatani. Namun, kurangnya dana dari pemerintah mengakibatkan terjadinya kerusakan saluran irigasi, sehingga dibutuhkan biaya tambahan untuk pemeliharaan saluran irigasi yang salah satunya dengan penerapan iuran irigasi. Maka penelitian bertujuan untuk (1) Menganalisis struktur biaya usahatani, (2) Mengestimasi pendapatan usahatani, (3) Mengestimasi nilai WTP iuran irigasi beserta faktorfaktornya, dan (4) Mengestimasi nilai ekonomi air irigasi. Metode yang digunakan untuk menjawab tujuan penelitian yaitu analisis struktur biaya usahatani, analsis pendapatan usahatani, Contingen Valuation Method dan regresi linier berganda, dan nilai ekonomi air dengan pendekatan water rent, iuran irigasi riil, dan rataan WTP. Berdasarkan hasil perhitungan, nilai WTP iuran irigasi pada petani penyewa sebesar Rp 106.675,00/luas lahan lebih tinggi dibandingkan dengan petani pemilik sebesar Rp 86.660,00/luas lahan dan faktor yang mempengaruhi nilai WTP yaitu produksi usahatani dan pendapatan luar usahatani. Kemudian, hasil perhitungan nilai ekonomi air dengan pendekatan water rent pada petani pemilik Rp 832,49/m3 yang setara dengan Rp 1.798,85/kg dan pada petani penyewa Rp 433,51/m3 yang setara dengan Rp 932,05/kg, kemudian dengan pendekatan iuran irigasi riil pada petani pemilik sebesar Rp 32,23/m3 yang setara dengan Rp 69,29/kg dan pada petani penyewa Rp 35,46/m3 yang setara dengan Rp 76,24/kg, sedangkan dengan pendekatan rataan WTP pada petani pemilik Rp 19,61/m3 yang setara dengan Rp 42,16/kg dan pada petani penyewa Rp 21,28/m3 yang setara dengan Rp 45,75/kg.
Keyword: irigasi, nilai ekonomi air, pendapatan usahatani, WTP

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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