Judul: Penetapan Basa-Basa Terlarut dan Dapat Ditukar pada Tanah Jasinga dengan Kejenuhan Basa Tinggi
Abstrak: Kation basa seperti Ca, Mg, dan K, adalah hara yang diperlukan tumbuhan. Kondisi curah hujan yang relatif tinggi menyebabkan tingkat pencucian hara dari dalam tanah berlangsung intensif, sehingga kadar basa-basa tanah menjadi rendah dan tanaman kekurangan berbagai hara. Namun demikian, hasil analisis contoh tanah Jasinga memiliki nilai kejenuhan basa (KB) tinggi bahkan lebih dari 100%, pada lokasi dengan penggunaan lahan hutan dan sawah. Penelitian ini bertujuan menetapkan basa-basa terlarut dan basa-basa dapat ditukar pada tanah dengan KB tinggi. Metode penetapan basa dilakukan untuk memisahkan basa-basa terlarut dengan basa-basa yang dapat ditukar. Contoh tanah kering angin diekstrak menggunakan larutan BaCl2 0,01 M untuk menetapkan basa yang terlarut, kemudian dilanjutkan dengan penggunaan larutan NH4OAc 1 M pH 7 untuk menetapkan basa yang dapat ditukar. Hasil penelitian menunjukkan kation basa terlarut lebih tinggi dibandingkan kation basa dapat ditukar pada penggunaan lahan hutan dan lahan sawah dengan urutan: Mg >> Ca >> Na > K. Kation basa di dalam tanah yang didominasi oleh Mg, diduga dapat menghambat penyerapan kation lain seperti Ca dan K., Base cations, such as Ca, Mg, and K, are essential nutrients for plants. High rainfall conditions cause intensive leaching of nutrients from within the soil, lowering the content of the soil bases and potentially depriving plants of nutrients. However, in the location with forest and rice field use, the results of the analysis sample of Jasinga's soil have high base saturation (BS), even more than 100%. The goal of this study was to determine the soluble and exchangeable bases of soil with high base saturation (BS). The analysis procedure was to separate soluble bases from exchangeable bases. The dry wind soil sample was extracted with BaCl2 0,01 M solution to determine soluble bases, and then with NH4OAc 1 M pH 7 solution to determine exchangeable bases. On the forest and rice field, soluble base cations were found to be higher than exchangeable base cations in the following order: Mg >> Ca >> Na > K. Base cations in the soil, which are dominated by Mg, may impede the absorption of other cations such as Ca and K.
Keyword: exchangeable bases, soluble bases, NH4OAc 1 M pH 7 solution, BaCl2 0,01 M solution

Judul: Evaluasi Status Hara Kalium Pada Tanah Sawah di Pulau Jawa
Abstrak: It was reported in 1975 by Research Centre for Soil and Agroclimate that the content of potassium (K) determined by HCl 25 % on paddy field in Java island ranged from low to high. Another report published in 2000 by above institution showed that most of paddy field in eighteen (18) provinces in Indonesia contained K in high status determined by HCl 25%, and most of them were located in Java island. The high content of K in paddy field especially in Java Island was due to application of K fertilizer in long periode. This long periode of K fertilizer application was supposed to cause unbalance soil nutrients status. The latter was one of the factors causing the leveling off in rice production. Therefore it is necessary to reevaluate the status of K in Java island to have good management and to maintain high rice production. The objectives of this research were to evaluate exchangeable K status on paddy field in Java island determined by 1 N NH4OAc pH 7, non exchangeable K and total K. Moreover the effect of location and soil order to the amount of exchangeable K, non exchangeable K and total K were also evaluated. Soil samples amounted to 23 samples from paddy field in Java island were collected. It consisted of 7 samples from West Java, 11 samples from Central Java and 5 samples from East java. Those soil samples were analysed for exchangeable K, non exchangeable K and total K. The results showed the content of exchangeable K, non exchangeable K and total K varied among locations and soil orders. For exchangeable K status in those samples varied from low to high status judged by criteria published by Research Centre for Soil and Agroclimate (1992). From 23 locations in Java Island, 9 locations were low status, 8 locations were medium status and 6 locations were high status. West Java consisted of 7 locations. From 7 locations in West Java, 2 locations were low status, 3 locations were medium status and 2 locations were high status. Central Java consisted of 11 locations. From 11 locations in Central Java, 4 locations were low status, 4 locations were medium status and 3 locations were high status. East java consisted of 5 locations. From 5 locations in East Java, 3 locations were low status, 1 location was medium status and 1 location was high status. Comparison of the mean values of exchangeable K among the provinces showed that all the provinces were in medium status. Locations and soil orders did not statistically significantly affected the differences of exchangeable K, non exchangeable and total K values. However this research revealed that Central Java contained the highest mean value of exchageable K and non exchangeable K and East Java contained the lowest mean values of those forms of K. As for total K, West Java contained the highest value of total K and East Java contained the lowest value of total K. Inceptisols contained the highest mean values of exchangeable K and total K, while Vertisols contained the highest mean values of
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Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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