Judul: Pengujian Efektivitas Bahan Pembenah Tanah Dolomit untuk Tanah Masam.
Abstrak: One effort to improve acid soil in supporting plants growth is by adding ameliorant such as lime. Lime addition was expected to decrease aluminum ion that can be toxic for plants and increase calcium and magnesium ions contents in acid soil. According to Decree of Minister of Agriculture No.02/pert/HK.060/2/2006 about rules and regulation of distributing soil ameliorant, i. e. each fertilizer or ameliorant should be tested in determining its quality and effectiveness before it is sold, therefore dolomite ameliorant has to be tested before it is traded. Based on the decree, the experiment to determine lime effectiveness needs much time that is incubation for about two months so that inefficient in time, thus a new method for quick test in order to determine the quality of lime is needed, i. e. method of material reactivity test. Lime effectiveness test regarding to method that is mentioned in the decree is conducted by mixing lime into soil with different dosage, those are 0, 0.5, 1.0 and 1.5 times of recomended dosage (1 x exchangeable Al) then all incubated for two months in field capacity condition. Soil sample that was used in this experiment was Podsolik Merah Kuning Jasinga and the experiment object was dolomite. Each treatment was repeated three times. Effect of ameliorant addition was observed by analizing soil samples every week. The observed parameters were pH and exchangeable Al. Whereas, the reactivity experiment method was done by reacting lime with various HCl concentration (0.05 N, 0.1 N and 0.2 N) without heating then shaking them with time variable and titration with NaOH. Reactivity of dolomite was compared with reactivity of CaCO3 pro analysis (p.a) and lime sample. The result of soil incubation experiment showed that dolomite which was added with dosage 1 x exchangeable Al increased soil pH from 4.43 to 4.80 after mixing and became 4.99 in the first week after mixing and also decreased soil exchangeable Al content from 4.43 to 1.35 me/100g after mixing. At the end of incubation period, soil pH became higher and exchangeable Al content became lower than the beginning. Whereas, the experiment of lime reactivity according to method that was used indicated that reactivity of lime sample was much lower than the tested dolomite and reactivity of dolomite was lower than CaCO3 p.a. The result showed that lime sample does not have ability in neutralizing acid but dolomite has a good ability to neutralize acid. The method of ameliorant effectiveness experiment was suitable for quick test in determining the quality of lime.
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Judul: Pengaruh Tiga Jenis Amelioran terhadap Perubahan Aldd, pH, dan Ptersedia pada Latosol Dramaga dan Podsolik Jasinga.
Abstrak: Latosol dan Podsolik terbentuk dari proses pelapukan dan pencucian intensif, sehingga memiliki kendala untuk digunakan sebagai lahan pertanian. Kendala pemanfaatan Latosol diantaranya adalah pH, kadar bahan organik, dan kejenuhan basa rendah. Kendala pada Podsolik diantaranya adalah kejenuhan Al dan erapan fosfor tinggi, serta pH, ketersediaan P, dan kejenuhan basa rendah. Oleh karena itu perlu dilakukan upaya untuk mengatasi kendala tersebut, diantaranya dengan pemberian amelioran. Penelitian ini bertujuan mempelajari pengaruh ameliorasi dolomit, kompos, dan arang sekam terhadap perubahan Aldd, pH, dan Ptersedia pada Latosol Dramaga dan Podsolik Jasinga. Penelitan ini menggunakan tiga contoh tanah, yaitu Latosol Dramaga dengan kadar Aldd 4.79 me/100g, Podsolik Jasinga 1 dengan kadar Aldd 13.75 me/100g, dan Podsolik Jasinga 2 dengan kadar Aldd 20.7 me/100g. Perlakuan ameliorasi yang dicobakan adalah pemberian dolomit, kompos, dan arang sekam. Penelitian dilakukan di rumah kaca menggunakan rancangan acak lengkap dengan 11 taraf ameliorasi dan 3 ulangan, sehingga terdapat 3x3x11x3 = 297 satuan percobaan. Setiap satuan percobaan berupa polybag berisi 500 g (BKM) tanah. Inkubasi perlakuan dilakukan selama 1 bulan. Selama masa inkubasi, kadar air tanah dipertahankan pada kondisi kapasitas lapang. Setelah itu dilakukan analisis tanah terhadap pH (H2O) 1:5, Aldd, dan Ptersedia (Bray 1). Hasil penelitian menunjukkan bahwa pemberian dolomit hingga taraf 2 x Aldd meningkatkan pH dan menurunkan Aldd ketiga tanah (Latosol Dramaga, Podsolik Jasinga 1, dan Podsolik Jasinga 2). Pemberian dolomit hingga taraf 0.8 x Aldd pada Latosol Dramaga menurunkan Ptersedia; namun pada Podsolik Jasinga 1 dan Podsolik Jasinga 2 meningkatkan Ptersedia, sedangkan pada taraf lebih tinggi menurunkan Ptersedia. Pemberian kompos dan arang sekam berpengaruh sama terhadap ketiga tanah, yaitu meningkatkan pH, menurunkan Aldd, dan meningkatkan Ptersedia.
Keyword: arang sekam, dolomit, kompos

Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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