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 Dolomit pada Sifat Kimia Tanah Berkadar Aluminium Tinggi dari Jasinga Bogor
Abstrak: Kondisi iklim tropika basah memungkinkan untuk terjadinya pelapukan tanah intensif dan menghasilkan tanah-tanah terlapuk lanjut. Salah satu tanah tersebut adalah Ultisol dari Jasinga, Kabupaten Bogor yang mempunyai Al dapat ditukar (Al-dd) sebesar 24.75 cmol(+)/kg dan kejenuhan aluminium 44.31% yang tergolong tinggi dan kejenuhan basa (KB) 13.78% yang tergolong rendah. Penggunaan tanah ini dibatasi oleh tingginya Al-dd yang beracun bagi tanaman. Kadar Al-dd dan kejenuhan Al dapat diminimalisir dengan cara perbaikan kondisi tanah (ameliorasi). Ameliorasi yang umum dilakukan adalah pengapuran. Penelitian ini bertujuan mengetahui pengaruh dolomit terhadap perubahan nilai pH, kation dapat ditukar (Al, Ca, dan Mg), KTK, kejenuhan Al, Fe tersedia, dan Mn tersedia. Penelitian dilakukan dalam Rancangan Acak Lengkap (RAL) satu faktor, terdiri dari enam perlakuan dan empat ulangan, sehingga terdapat 24 satuan percobaan. Perlakuan berupa dosis dolomit setara 0, 0.5, 1.0, 1.5, 2.0 dan 2.5 x Al-dd. Penelitian dilaksanakan pada bulan Juni sampai dengan Oktober 2018 di Kebun Percobaan Cikabayan dan Laboratorium Kimia Kesuburan Tanah Departemen Ilmu Tanah dan Sumberdaya Lahan IPB. Perlakuan dolomit nyata meningkatkan pH tanah, Ca dan Mg dapat ditukar, dan KB. Pelakuan dolomit sebaliknya nyata menurunkan Al-dd dan kejenuhan Al. Perlakuan dolomit 2.5 x Al-dd mampu menurunkan nilai Al-dd menjadi 2.31 cmol(+)/kg dan kejenuhan Al 4.5%; sebaliknya meningkatkan pH menjadi 5.34, Ca dan Mg dapat ditukar masing-masing 22.95 cmol(+)/kg dan 16.69 cmol(+)/kg, serta Fe tersedia dan Mn tersedia masing-masing 24.0 ppm dan 24.6 ppm. Pola perubahan pada setiap variabel dengan waktu inkubasi menunjukkan nilai maksimum dan titik puncak yang berbeda-beda.
Keyword: ameliorasi, kejenuhan Al, tanah masam

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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