Judul: Desain Konstruksi Jalan Usahatani di Petakan Tersier Lahan Sawah (Kasus di Cikarawang Bogor)
Abstrak: Hasil pertanian yang mempunyai sifat mudah rusak harus ditangani secara baik dan benar, sehingga penurunan mutu dan kehilangan hasil pertanian dapat dihindari. Oleh karena itu pada daerah sentra produksi pertanian diperlukan adanya prasarana jalan usahatani yang memadai. Tujuan penelitian ini adalah (1) mendesain konstruksi jalan usahatani di petakan tersier dan membuat prototipe subgrade jalan usahatani, (2) menguji kekuatan dari prototipe subgrade jalan usahatani. Kriteria desain konstruksi jalan usahatani di petakan tersier lahan sawah mencakup : (1) spesifikasi kendaraan / alat angkut yang direncanakan, (2) kriteria jalan usahatani, (3) kriteria saluran tersier, (4) karakteristik tanah dasar (subgrade) jalan usahatani. Pengujian dilakukan dengan Calfornia Bearing Ratio (CBR) rendaman untuk bahan tanah timbunan, dan dengan Dynamic Cone Penetrometer (DCP) untuk prototipe subgrade jalan usahatani. Nilai CBR akan berbeda-beda sesuai dengan kedalaman lapisan yang diuji. Pada kedalaman 0-340 mm, 340-590 mm dan kedalaman 590-950 mm berturut-turut diperoleh nilai CBR rata-rata sebesar 7.62%, 19.67% dan 21.90%, lebih besar dari nilai CBR rencana yaitu 5.7%. Hal ini berarti subgrade memenuhi syarat kekuatan. Hasil desain konstruksi jalan usahatani di petakan tersier adalah (1) lebar atas subgrade jalan usahatani 2 m termasuk perkerasan jalan, (2) tinggi subgrade jalan usahatani 0.90 m, (3) kemiringan subgrade jalan usahatani 1:1.2, (4) tebal perkerasan jalan usahatani 7 cm dan tidak dibuat prototipenya, (5) pada kedalaman tanah subgrade 0.50 m dipasang saluran tersier dari pipa berdiameter 6 inci.
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Judul: Desain Konstruksi Jalan Usahatani di Petakan Tersier Lahan Sawah (Kasus di Cikarawang Bogor)
Abstrak: Perishable nature of agricultural product must be handled properly, to avoid deterioration and loss of product. Therefore, the centre area of agricultural production requires adequate farm road. The objectives of this research were: (1) to design the construction of farm road at tertiary plot and make the subgrade prototype of farm road, and (2) to analyze the strength of subgrade prototype. The design criteria of farm road construction were identified based on : (1) specification of vehicle, (2) the criteria of farm road, (3) the criteria of tertiary canal, (4) the characteristics of subgrade. The strength of subgrade prototype was analyzed by California Bearing Ratio (CBR) and Dynamic Cone Penetrometer (DCP). The result showed that on the depth of 0 – 340 mm, 340 mm – 540 mm and a depth 590 mm – 950 mm consecutively CBR had an average value of 7.62%, 19.67% and 21.91%. These value were bigger than CBR plan 5.7 %. It indicated that the subgrade strength was eligible. Design result of farm road construction at tertiary plots of paddy field were: (1) width of subgrade of farm road 2 m, (2) height subgrade of farm road 0.90 m, (3) slope of subgrade farm road 1:1.2, (4) thickness of farm road pavement 7 cm and nor prototype, (5) the tertiary channel using 6 inch diameter pipe was installed at the depth of 0.5 m of subgrade soil.
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Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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