Judul: Optimasi konsentrasi larutan hara tanaman Pak Choi (Brassica rapa L. cv. group Pak Choi) pada teknologi hidroponik sistem terapung
Abstrak: Penelitian ini bertujuan untuk menentukan konsentrasi larutan hara yang optimum untuk pertumbuhan dan produksi Pak Choi yang ditanam dengan Teknologi Hidroponik Sistem Terapung. Penelitian ini dilaksanakan di fasilitas Deep Pool Growing System, Danasworo Hydro Garden, Ciapus Bogor mulai bulan November 2005 sampai Maret 2006.
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Judul: Optimasi konsentrasi larutan hara pada budidaya selada (Lactuca sativa L. var. crispa) dengan teknologi hidroponik sistem sistem terapung
Abstrak: Peneliti ini bertujuan untuk mempelajari dan menentukan konsentrasi larutan hara yang optimum terhadap pertumbuhan dan produksi selada yang dibudidayakan dengan Teknologi Hidroponik Sistem Terapung (THST). Penelitian dimualai sejak November 2005 hingga Maret 2006, bertempat di fasilitas Deep Pool Growing System, Danasworo Hydrogarden, Ciapus Bogor. Rancangan yang digunakan adalah Nested Design dengan faktor tunggal berupa konsentrasi larutan hara (K) yang terdiri dari empat taraf perlakuan yaitu K1 ( kontrol tanpa penambahan hara), K2 (EC = 0.75 mS.cm-1), K3 (EC = 1.50 mS.cm-1) dan K4 (EC = 2.25 mS.cm-1). Masing-masing perlakuan terdiri dari 20 ulangan sehingga terdapat 80 unit percobaan. Ulangan tersebut tersarang di dalam perlakuan. Setiap unit percobaan terdiri dari 15 tanaman sehingga jumlah tanaman yang digunakan adalah sebanyak 1200 tanaman.
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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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