Judul: Karakterisasi Erapan Nitrat pada Tanah Pertanian Lahan Kering di Pulau Jawa.
Abstrak: The urea fertilizer and manures were used excessively by farmers. It caused the accumulation of nitrate in Agriculture soils. The knowledge of soil capability to sorb nitrate is very important concerning the nitrate movement in soil profile. The objectives of this research were to (1) Characterization of physico-chemical properties of upland soils in Java island, (2) Finding the best equation to simulate nitrate sorption on upland soils in Java island, and (3) Correlation between physico-chemical properties and parameters of nitrate sorption. Prior to nitrate sorption, the soil was saturated with chloride ion. Afer that, the 2.00 g of soil was equilibrated in 5 ml solution containing 0.005 to 0.2 mol L-1 of KNO3. After equilibrium was reached, nitrate was determined by UV Spectrophotometer with wave length 210 nm and then was corrected with 275 nm for dissolve organic carbon (C). The nitrate sorption data were simulated with Langmuir, Temkin and Freundlich equation. The results showed that the Freundlich equation simulated nitrate sorption better than Langmuir and Temkin. The R2 of equation of Freundlich ranged from 0.87 to 0.99. The nitrate sorption maxima (K) of Freundlich were positively correlated with total C (r=0.27), oxalate-extractable aluminum (Alo) (r=0.41), oxalate-extractable iron (Feo) (r=0.16), dithionite-citrate-bicarbonate-extractable aluminum (Ald) (r=0.34), dithionite-citrate-bicarbonate-extractable iron (Fed) (r=0.01) and Alo + ½ Feo (r=0.42). The K values were negatively correlated with clay content (r=-0.19). As for n values of Freundlich equation, it was positively correlated with total C (r=0.11).
Keyword: tempkin, soil properties, nitrat, langmuir, freundlich, sorption

Judul: Uji Kalibrasi Nitrogen pada Tiga Tanah Tropika Masam di Jawa Barat
Abstrak: This Study is a part of program series on the establishment and development of N, P, and K fertilizer recommendation for dry land food crops (dry land rice, corn, and soybean) on acit tropical soils based on soil and crop characteristics. Results of the preceding correlation study showed that the use of N-Kjeldahl and C-Walkley&Black extraction method - to determine, respectively, soil total nitrogen and organic carbon or organic matter - gave a sigiificant correlation with nitrogen absorption of the test plant. The content of soil organic-C can be used to estimate the availability of soil nitrogen since almost all of the soil nitrogen is found in the fonn of organic compounds.
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Judul: Morfologi dan siklus hidup babesia canis pada vektor caplak dan induk semang anjing
Abstrak: Babesiosis adalah penyakit hewan menular yang dapat bersifat akut sampai menahun (kronis). Penyebabnya adalah protozoa dari genus Babesia yang menyerang dan merusak sel darah merah (Howe, 1971). Pada anjing pertama kali diketahui oleh Piana dan Galli-Vallerio (1895). Sebagai vektor tunggalnya adalah caplak. Jenis caplak yang dapat sebagai vektor dari Babesia canis antara lain Rhipicephalus sanguineus, Dermacentor marginatus, D. pictus, D. venustus, Hyalomma marginatum, Haemaphysalis leachi. Morfologi Babesia bergantung kepada siklus hidup dan jenisnya. Adapun morfologi Babesia canis dapat dibagi menjadi dua kelompok yaitu pada caplak sebagai vek- tornya dan anjing sebagai induk semangnya. Morfologi Babesia canis pada caplak Rhipicephalus sanguineus akan terlihat bentukan seperti flagella yang kaku dengan tonjolan 11 keluar yang disebut Strahlenkorper atau ray bodies, dengan diameter 4 7 milimikron yang terdapat pada sel usus caplak (Mehlhorn te al, 1980 dalam Baker dan Muller, 1984). Bentuk Babesia canis di dalam eritrosit seperti buah pir, dapat tunggal atau berpasangan berukuran 4 5 mikron. ...
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