Judul: Pengaruh Faktor Pembentuk Agregat Tanah terhadap Kemantapan Agregat Tanah Latosol Dramaga pada Berbagai Penggunaan Lahan
Abstrak: Latosol Soil generally used for agricultural activities. Soil aggregate stability is an important property because it affects to many other soil physical properties. Soil aggregate stability is influenced by various factors of foundation soil aggregate such as soil texture, clay mineral type, exchangeable cations, soil organic matter, biological processes, land use and soil tillage. The purpose of this research is to identify the influence of land use of soil aggregate stability and soil factors that influence on soil aggregate stability in Latosol Soil Dramaga. Analyzed parameters were soil aggregate stability, soil texture, soil organic matter, exchangeable calcium, magnecium, sodium. The analysis showed soil aggregate stability on all land uses were classified to very stable category (ISA> 200). Soil aggregate stabiliy was influenced by land use (P< 0.05). Highest soil aggregate stability was founded in Cocoa Garden and lowest in the Cassava Garden. Land use affected the Latosol Soil aggregates stability and aggregateforming factors such as soil organic matter and exchangeable calcium (P< 0.05). Analysis of variance showed soil aggregate stability were significantly influenced by percent of soil organic matter, exchangeable calcium, magnecium and sodium, and percent of clay and sand (R-Square = 93%, P< 0.05). The exchangeable calcium and magnecium had the highest impact than the other aggregate form factor in soil aggregates stability (P = 0.004).
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Judul: Evaluation of Aggregate Stability Determintaion Methods and Soil Aggregate Stability in Various Soil Types
Abstrak: Penetapan stabilitas agregat tanah dilakukan dengan metode pengayakan kering dan basah. Terdapat dua alat pengayakan kering dan basah yang dapat digunakan untuk menentukan Indeks Stabilitas Agregat (ISA) di Laboratorium Konservasi Tanah dan Air yaitu: set ayakan dengan diameter 20,5 cm (ayakan A) dan 15 cm (ayakan B). Masing-masing menggunakan ukuran agregat mulai dari ≤ 7,9 mm dan ≤ 2,83 mm. Perbedaan ukuran diameter agregat tanah yang digunakan dapat menghasilkan indeks stabilitas yang berbeda apabila didasarkan pada kriteria yang ada. Penelitian ini bertujuan melakukan evaluasi pada kedua metoda penetapan dengan menetapkan faktor konversinya dan mengidentifikasi stabilitas agregat berbagai jenis penggunaan lahan pada berbagai jenis tanah. Perbedaan jenis tanah dan penggunaan lahan merupakan faktor yang dapat mempengaruhi indeks stabilitas agregat tanah. Pola distribusi rata-rata bobot diameter agregat tanah tidak berbeda hingga ukuran 1 mm. Metode pengayakan B menunjukan ISA yang jauh lebih tinggi dibanding metode pengayakan A. ISA metode pengayakan B 3,3-5,2 kali lebih tinggi dari metode pengayakan A. Faktor konversi dari ISA metode pengayakan B ke A menghasilkan persamaan y = 0,1704x + 13,883 untuk Latosol, y = 0,1583x + 20,493 untuk Regosol, y = 0,2835x + 0,5637 untuk Podsolik, dan persamaan yang berlaku untuk semua jenis tanah dengan nilai y = 0,1888x + 15,299. Nilai ISA tertinggi dijumpai pada Podsolik selanjutnya Latosol dan Regosol terendah. Podsolik dengan penggunaan lahan tegakan bambu memiliki nilai ISA tertinggi, dan yang terendah pada Latosol dengan penggunaan lahan kebun konservasi., Soil aggregate stability was determined by using dry and wet sieving method. There are two dry and wet sieving devices that can be used to determine the Aggregate Stability Index (ASI), namely: sieve equipment with a diameter of 20.5 cm (sieve A) and 15 cm (sieve B). The soil aggregate size there use are ranging from ≤7.9 mm and ≤2.83 mm. Different sizes of soil aggregate being used in the two methods could produce a different stability index when based on existing criteria. This study aims to evaluate method of soil aggregate stability measurment by setting ASI conversion factor from method B to method A and identify soil aggregate stability in various type land uses and soil types. Different land uses and soil types are the factors that can affect the soil aggregate stability index. The average pattern of soil aggregates distribution is similar up to 1 mm aggregate size. Sieving B method shows a much higher ASI value than sieving A method. The ASI of sieving B is 3,3-5,2 times higher than sieving A method. The conversion factor of sieving B method ASI to sieving A method ASI are y = 0.1704x + 13.883 for Latosol, y = 0.1583x + 20.493 for Regosol, and y = 0.2835x + 0.5637 for Podzolic. The general conversion factor for various types of soil is y = 0.1888x + 15.299. The highest ASI values were found in Podzolic, followed by Latosol and the lowest was Regosol. Podzolic with land use of Bamboo Stands has the highest ASI value, and the lowest is in Latosol with Conservation Agriculture Field land use.
Keyword: evaluate methods of determination, soil type, land use, soil aggregate stability

Judul: Infeksi Cacing Jantung Dirofilaria Immitis, Railliet & Henry, 1911 Pada Anjing
Abstrak: Cacing Dirofilaria immitis dewasa yang tinggal dalm ventrikel kanan jantung anjing, sering kali menimbulkan gejala klinis yang cukup berat. Cacing Tersebut menghasilkan mikrofilaria yang selanjutnya berkembang menjadi larva infektif dalam saluran malphigi induk semang entara, yaitu nyamuk dari genus Culex, Aedes dan Anopheles.
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