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: Nitrogen Mineralization of Four Andisol Soil Depths which is Cultivating Organic and Conventional in Ciwidey and Cisarua.
Abstrak: Conventional agricultural system uses pesticide and organic fertilizer excessively that cause nutrient accumulation in waters and ground water that can pollute environment. Nitrogen is one of essential nutrient with low availability in the ground. Nitrogen is dynamic nutrient and easy to change. Therefore it needs to obtain information about nitrogen mineralization degrees especially NH4+ and NO3- in some depths of Andisol soil which is developed for cultivating organic and conventional in Ciwidey and Cisarua. The soil samples were taken from 0-25, 25-50, 50-75, and 75-100 cm depths at Ciwidey (Bukit Organik) and Cisarua (Permata Hati dan Bina Sarana Bakti). Drilling was done in each embankment of four points which were chosen randomly of each cultivating area. Soil samples of four points were mixed to homogenous. NH4+ and NO3- contents of the soil were analyzed using KCl and CaCl2 spectrophotometric methods. Based on the results, there was a difference of nitrogen mineralization (content of NH4+ and NO3-) in the some depths of Andisol soil which is developed for cultivating organic and conventional at Permata Hati, Bukit Organik, and Bina Sarana Bakti. Nitrogen mineralization of NH4+ in the soil of organic cultivating is slower than conventional cultivating.
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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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