Judul: Soil Quality Assessment for Vegetable Management Practice with KMnO4 Oxidizable Method
Abstrak: A simple method of estimating biologically active soil organic carbon (SOC) can accelerate determination of soil quality related to soil organic matter (SOM) content. Changes in biologically active SOC can be used in evaluating the impact of vegetable management and other agricultural practices on soil quality. Regional estimates of SOC changes can only be obtained by analyzing very large number of samples over large areas due to the strong spatial variability in SOC contents. Visible and Near Infrared Spectroscopy (VNIRS) provides an alternative to chemical analyses. The benefits of this technique include a reduction of the sampling processing time, an increase of the number of samples that can be analyzed within time and budget constraints, hence an improvement of the detection of small changes in SOC stocks for a given area. This study report on a highly simplified method in which neutral dilute solutions of potassium permanganate (KMnO4) reacts with most of the active fractions of SOM, changing the deep purple color of the solution to a light pink color. Pearson correlation was used to compare laboratory and field-kit protocol with other soil quality indicators. Results from the laboratory and field-kit protocols were nearly identical (r=0.99, R2=0.98), not significant t test, not different CV (range 10- 14%), and not different coefficient of correlation.
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Judul: Pengujian metode uji cepat penetapan kadar C-Organik
Abstrak: Before being introduced for wide application, the reliability of quick test method for soil organic carbon content has to be evaluated. The objective of this experiment was to evaluate quick test method for determining soil organic carbon content developed by Indonesian Soil Research Institute. In this research the effect of soil sample preparation (comparison between prepared soil sample and unprepared/direct soil sample) and the effect of kinds of reagent (IA or IB) were evaluated. For this purpose, froth height data of quick test of soil organic carbon was correlated with organic carbon content of Walkley and Black method. In addition, the best time for froth height observation was determined in this research. Calibration of froth height was conducted on organic carbon content of Walkley and Black method (%) for categorizing froth height into classes of low, médium, and high. Research results indicated that the quick test method was better to be applied on direct soil samples (without air drying, crushing, and sieving), both for reagents IA and IB. Reagent IA was better than reagent IB, and both kinds of reagent were better for analyzing organic carbon content of paddy soil.
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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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