Judul: Optimasi Produksi Selada Merah (Lactuca sativa var.Crispa) Menggunakan Metode Permukaan Respon
Abstrak: Metode permukaan respon merupakan suatu model gabungan teknik statistika dan matematika yang digunakan untuk membuat model dan menganalisis respon yang dipengaruhi oleh beberapa peubah bebas kuantitatif guna mengoptimumkan respon tersebut. Tujuan penelitian ini adalah mendapatkan kombinasi volume irigasi dan frekuensi pemupukan pada tanaman selada merah yang menghasilkan rata-rata bobot segar pasar maksimum. Data yang digunakan adalah sebagian data penelitian yang dilakukan oleh Budi Firman Haryono, mahasiswa Departemen Agronomi dan Hortikultura Institut Pertanian Bogor pada tahun 2014. Hasil analisis menunjukkan bahwa model ordo kedua sesuai untuk digunakan. Titik stasioner yang dihasilkan merupakan titik pelana sehingga titik maksimum tidak unik. Ridge analysis dapat membantu menentukan arah untuk mencari titik maksimum. Hasil dari ridge analysis menunjukkan bahwa titik maksimum rata-rata bobot segar pasar bernilai 92.71 gram dengan kombinasi taraf volume irigasi 3.22 x Eo dengan frekuensi pemupukan 4.74 hari sekali.
Keyword: Optimum poimt, Red lettuce, Response surface method, Ridge analysis, Saddle point, Model ordo, Pengkodean, Peubah babas, Titik stasioner, Ridge analisis

Judul: Response of growth and productivity on red lettuce (lactuca sativa var. Crispa) to irrigation volume and fertilizer frequency with sandphonics
Abstrak: Penelitian ini dilakukan untuk mempelajari adanya pengaruh volume irigasi dan frekuensi pemupukan terhadap pertumbuhan produksi selada merah (Lactuca Sativa Var. Crispa), dengan media hidroponik pasir. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) terdiri dari dua faktor tiga ulangan. Faktor pertama adalah volume irigasi terdiri atas 4 taraf yaitu, I1(1xEo), I2(2xEo), I3(3xEo), I4(4xEo). Faktor kedua adalah frekuensi pemupukan yang terdiri atas 4 taraf yaitu, F1: 4 hari sekali, F2: 6 hari sekali, F3: 8 hari sekali, F4:12 hari sekali, dengan konsentrasi yang sama disetiap perlakuannya yaitu 1.5 g/l. Volume irigasi 4Eo memberikan pengaruh yang sangat nyata pada tinggi tanaman dan jumlah daun berumur 2, 3, dan 4 MST (Minggu Setelah Tanam), bobot total basah, bobot tajuk atau bobot pasar tanaman, bobot kering total tanaman, ratarata panjang dan lebar daun tanaman saat panen. Frekuensi pemupukan 4 hari sekali memberikan pengaruh yang sangat nyata pada tinggi tanaman dan jumlah daun berumur 2, 3, dan 4 MST, bobot total basah, bobot tajuk atau bobot pasar tanaman, bobot kering total tanaman, rata-rata panjang dan lebar daun tanaman saat panen. Pengaruh interaksi antara frekuensi pemupukan dengan volume irigasi yang dihasilkan pada tanaman selada merah berbeda nyata terhadap jumlah daun pada 2, 3, dan 4 MST, bobot total basah tanaman, bobot tajuk atau bobot pasar tanaman, serta bobot kering total tanaman dengan nilai tertinggi pada perlakuan frekuensi pemupukan 4 hari sekali dan volume irigasi 4Eo, This research was conducted to study about effect of irrigation volume and fertilization frequency on Red Lettuce (Lactuca Sativa Var. Crispa) growth and production with sandphonics. The research was arranged in randomized completely block design, consisting of two factors with three replications. The first factor was irrigation volume consisted on four levels: I1(1xEo), I2(2xEo), I3(3xEo), I4(4xEo). The second factor was fertilization frequency consisted of four levels: F1: every 4 day, F2: every 6 day, F3: every 8 day, F4: every 12 day, with the same concentrate in every treatment is 1.5 g/l. The volume of irrigation 4Eo provide a significant influence on height of plant and amount of leaves was 2, 3, and 4 WAP (Weeks After Planting), wet weight, the weight of the plant canopy or marketable weight, total dry weight, average length and width of leaves at harvest. The frequency of fertilization 4 days gave a significant influence on height of plant and amount of leaves was 2, 3, and 4 WAP, total weight, the weight of the plant canopy or marketable weight, total dry weight, average length and width of leaves at harvest. Effect of the interaction between the frequency of fertilization with irrigation volume generated on the red lettuce plants was significantly different to the amount of leaves at 2, 3, and 4 WAP, the total wet weight of the plant, the weight of the plant canopy or market weight, and total plant dry weight with the highest value at the treatment of the frequency of fertilization every 4 days and the volume of irrigation 4Eo.
Keyword: hidroponik, hidroponik pasir, irigasi, selada merah, pemupukan

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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