Judul: Mineralization potency of N-NH4 + and N-NO3 - at Andisol Soil planted vegetables on highly upland.
Abstrak: Nitrogen is one of essential minerals for plant but it has less availability in the soil. Nitrogen is absorbed by plant as NH4 + (ammonium) and NO3 - (nitrate). Nitrogen organic in the soil is easy to change so this experiment was carried out to measure mineralization potency of N-NH4 + and N-NO3 - at Andisol Soil planted vegetables on highly upland. Andisol soils sample used came from Kejajar Wonosobo and Sumowono Semarang represent farmer 1 and 2. The first step of analysis was preparation of soil sample, and put it into PVC (diameter 5,4 cm and high 10 cm) for incubation. Experiment needed 102 days incubation with 9 times sampling with time duration of each sampling is 0, 7, 18, 31, 46, 60, 74, 88, and 102 days. Then, NH4 + and NO3 - contents of the soil were analyzed using KCl and CaCl2 spectrofotometri method. Based on the experiment, mineralization potency of released N-NH4 + at Kejajar Wonosobo from soil farmer 1 and 2 were 7,45 and 7,15 mg kg-1, whereas N-NO3 - of farmer 1 and 2 were 111,20 and 123,41 mg kg-1, respectively. Mineralization potency of released N-NH4 + at Sumowono Semarang from soil farmer 1 and 2 were 7,23 and 7,17 mg kg-1, whereas N-NO3 - of farmer 1 and 2 were 94,95 and 103, 55 mg kg-1, respectively. Ammonium or Nitrate mineralization processes almost has same pattern in andisol soils at Kejajar Wonosobo and Sumowono Semarang.
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Judul: Slow Release N-Urea dalam Bentuk NH4+ dan NO3- setelah Aplikasi Arang Aktif pada Tanah Andisol
Abstrak: Urea is fertilizer that has low efficiency absorption in soil-plant system, which is about 30-50%. This is due to highly hygroscopic nature of urea that made urea dissolve easily into groundwater as nitrate when it applied to plants. Slow release fertilizer releases essential nutrient contained in urea slower than original urea fertilizer. Agriculture waste could be used as activated carbon which used to coat the urea in order to make slower release. The activated carbon in this study functioned in two different ways, as a coating material for the urea and as an adsorbent of urea residue. The research aimed to compare decreasing efficiency of dissolved urea as NH4+ and NO3- in Andisol soils using four activated carbon materials: coconut shells, rice hulls, corn cobs, and palm empty bunch during incubation period of 30 days. The result pointed out that the activated carbon could decrease NH4+ and NO3- dissolved in soil about 4-44% as compared with the control soils. It also showed that the activated carbon was the most effective in decreasing dissolved NH4+ and NO3- were those derived from coconut shells and rice hulls.
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Judul: Warna bulu kucing ras Persia : variasi pola warna dan pewarisannya
Abstrak: Kucing Persia merupakan kucing ras yang paling umum dijumpai di Indonesia. Kucing Persia memiliki bulu yang panjang dengan variasi warna bulu yang sangat beragam. Perkawinan yang lebih terarah sangat perlu dilakukan untuk meningkatkan kualitas genetik warna dan pola warna bulu kucing. Penelitian ini bertujuan untuk mempelajari variasi warna dan pola warna bulu kucing Persia yang terdapat di Indonesia, yang dilakukan di kantor pusat Cat Fancy Indonesia mulai bulan Oktober 2000 sampai Januari 2001. Data yang digunakan merupakan data pedigree kucing Persia yang tercatat di Cat Fancy Indonesia dari tahun 1997 sampai Oktober 2001 yang terdiri dari 187 jantan dan 258 betina, selain itu juga dilakukan pengamatan langsung kepada tiga penyayang dan breeder kucing yang ada di Bandung. Secara umum tercatat 104 penyayang dan breeder kucing ras di Indonesia, 74,04% terdapat di Jawa Barat dan sisanya (25%) terdapat di daerah Jakarta. Jumlah kucing Persia yang lahir di Indonesia adalah 387 kucing (87,16%), yang terdiri dari 163 (42,12%) jantan dan 224 (57,88%) betina. Jumlah kucing Persia yang diimpor ke Indonesia adalah sebanyak 57 (12,845%) yang terdiri dari 23 (40,35%) jantan dan 34 (59,65%) betina. Jumlah kucing Persia yang terdapat di Jawa Barat (84,14%) lebih banyak dibanding jumlah kucing Persia yang ada di Jakarta (14,86%). Secara umum warna bulu cream (9,01%) dan pola warna solid (34,01%) memiliki persentase tertinggi. Warna cream merupakan warna dilusi dari warna merah (red) yang dapat dihasilkan dari berbagai macam kombinasi warna bulu yang dimiliki tetua sebelumnya, sebagai contoh dari perkawinan tetua yang memiliki warna bulu cream dengan red smoke. Perkawinan antara tetua yang memiliki warna dan pola warna bulu yang tidak murni dapat menghasilkan turunan yang memiliki warna dan pola warna bulu yang bervariasi.
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