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: Peptides Hydrolysate Derived from Collagen of Snakehead Murrel (Channa striata) Skin Demonstrate Anti-oxidant and Anti-cholesterol Activities.
Abstrak: Anti-cholesterol and anti-oxidant play crucial role to combat cardiovascular disease (CVD) related to formation of arterial plagues from oxidation of cholesterol. In the past decades, research on bioactive peptides demonstrating anti-cholesterol and anti-oxidant activities have been reported as the alternative drugs. In this study, acid soluble collagen was extracted from the skin of snakehead murrel and employed to induce production of collagenase by Bacillus licheniformis F11.4. The collagenases secreted were in turn purified through AKTA Purifier (ion exchange, DEAE column) and used to produce peptides hydrolysate. The purified enzymes were grouped in two distinct collagenase fractions, designated as fraction D and F. Peptides hydrolysate produced by the fraction D was found to demonstrate HMG-CoA inhibitor activity comparable to pravastatin and limited anti-oxidant activity. Meanwhile, peptides hydrolysate generated using the fraction F demonstrated anti-oxidant activity comparable to BHT (2mM), vitamin C (2mM) and vitamin E (2mM), but limited HMG-CoA activity. Combination of the fraction D and F resulted in substantial HMG-CoA inhibition and anti-oxidant activities.
Keyword: Anti-cholesterol, anti-oxidant, bioactive peptide, collagen, collagenase, snakehead murrel