Judul: Analisis Kebutuhan Irigasi Padi Berdasarkan Metode KP-01 dan CROPWAT 8
Abstrak: There are two different methods for determining irrigation water requirement for paddy, KP-01 and CROPWAT 8, by using climate data. The object of this research was irrigation water requirement. The purpose of this research was to analyse paddy irrigation requirement based on KP-01 method and CROPWAT 8. Those methods have different criterias to determine irrigation water requirement. That can be shown from parameters used such as reference crop evapotranspiration (ETo), effective rainfall, land preparation, crop coefficient and physical soil data. According to the two methods, the average ETo value in KP-01 method was higher than in Penman-Monteith method (CROPWAT 8), 123.61%. Ratio of effective rainfall percentage KP-01 to CROPWAT 8 was 42.91%. Water requirement for land preparation using CROPWAT 8 was calculated from the water requirement during scheduling pre puddling and puddling, while KP-01 used a method developed by Van de Goor and Zijlstra. Water requirement for land preparation using CROPWAT 8 method was larger than KP-01. Paddy irrigation water requirement from CROPWAT 8 calculation was generally lower than that of KP-01, because the effective rainfall (in CROPWAT 8) have fulfilled crop water requirement.
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Judul: Kajian Kebutuhan Air Irigasi di Pulau Jawa Berdasarkan Klasifikasi Agroklimat Oldeman.
Abstrak: Tanaman pangan sangat rentan terhadap perubahan iklim. Hal ini karena tanaman pangan umumnya merupakan tanaman semusim yang relatif sensitif terhadap cekaman, terutama kelebihan dan kekurangan air. Oleh karena itu dibutuhkan kajian untuk menentukan besar kebutuhan air tanaman berdasarkan klasifikasi iklim setiap daerah. Hal ini akan menentukan besarnya irigasi yang dibutuhkan mengingat terdapat variasi curah hujan bulanan yang terjadi pada pada setiap daerah. Tujuan penelitian ini adalah menghitung kebutuhan air tanaman (ETc) dan kebutuhan air irigasi (KAI) berdasarkan klasifikasi agroklimat Oldeman. Perhitungan ini menggunakan metode Pennman-Monteith yang terdapat pada program CROPWAT. Analisis menunjukkan bahwa ETc setiap tipe iklim bervariasi tergantung pada jenis tanaman pangan yang digunakan. Hasil analisis menunjukkan nilai kebutuhan air irigasi padi sawah, jagung dan kedelai di Pulau Jawa secara keseluruhan. KAI padi sawah berkisar antara 0.08-0.52 lt/dt/ha dengan rata rata 0.15 lt/dt/ha, untuk jagung antara 0-0.23 lt/dt/ha dengan rata-rata 0.05 lt/dt/ha, dan untuk kedelai antara 0-0.52 lt/dt/ha dengan rata-rata 0.18 lt/dt/ha. Terjadi defisit air pada seluruh wilayah di Pulau Jawa untuk tanaman padi sawah. Defisit air terjadi pada 90% areal tanaman jagung dan 67% areal tanaman kedelai di Pulau Jawa.
Keyword: agroklimat, CROPWAT, ETc, kebutuhan air irigasi, Oldeman

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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