Judul: Pengaruh Pemberian Zeolit terhadap Kapasitas Tukar Kation (KTK) Tanah dan Produksi Tomat (Lycopersicon esculentum Mill.)
Abstrak: Penelitian ini dilaksanakan di Rumah Kaca dan Laboratorium Jurusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor. Tujuan penelitian adalah untuk mencari dosis zeolit yang optimal sehingga memberikan produktivitas yang optimal dan mengetahui pengaruh zeolit terhadap produksi tomat pada tanah Ultisol dari Jasinga dan Entisol dari Sindangbarang.
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Judul: Studi Pemamfaatan Mineral Zeolit sebagai Pengikat Amonium dan Pengaruhnya Terhadap Beberapa Sifat Kimia Media, Kadar Hara dan BObot Kering Tanaman Tomat (Lycopersicon esculentum Mill) Varietas Ratna
Abstrak: Penelitian ini bertujuan untuk mempelajari dan menge- tahui pengaruh pemberian zeolit, nitrogen, pupuk kandang dan kapur pada media terhadap pengikatan amonium, sifat kimia media, kadar hara dan bobot kering tanaman tomat. Penelitian menggunakan media campuran tanah Latosol Kotabumi (Oxic Dystropept), pupuk kandang dan kapur. Media A adalah tanah Latosol, media B tanah ditambah pupuk kandang dengan takaran 20 ton/ha, dan media C adalah tanah ditambah pupuk kandang dan kapur berdasar metode pH SMP. Setiap media kemudian ditambahkan mineral zeolit dan urea sebagai perlakuan. Zeolit yang digunakan adalah zeolit. Cikalong, didominasi klinoptilolit dan mordenit, berukuran 60 mesh yang telah diaktifkan melalui pemanasan pada suhu 250 °C selama dua jam. Takaran zeolit yang digunakan adalah 0, 10, 20, 40, dan 80 ton/ha. Takaran nitrogen yang digunakan adalah 100 dan 200 kg/ha dari sumber urea. Pupuk dasar yang diberikan adalah 200 ppm TSP, 200 ppm KC1, 5 ppm CuSO4, 5 ppm ZnSO4, 100 ppm MgS04, 1 ppm NH4M003, dan 2 ppm H3B03. Sebagai pembanding dicobakan pula media yang mengandung 10% tanah, 20 % pupuk kandang, dan 70 % zeolit (50% ukuran 25 mesh dan 50% ukuran 60 mesh) yang diperlakukan dengan nitrogen kg/ha dan 200 kg/ha. 100
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Judul: Identifikasi Molekuler Kompleks Spesies Himantura uarnak (Batoidea: Dasyatidae) di Indonesia.
Abstrak: Stingrays are one of the cartilaginous fish, apart of sharks and skates, and one of Indonesia's fishery resources. Almost of elasmobranch fishes are economically important fish. The refined products and live specimens of this fish are a lot of traded. Himantura uarnak, H. undulata and H. leoparda are stingray species in Himantura and Dasyatidae family, which are the most popular stingrays in Indonesia waters. The stingrays are major target species were used as a consumable product and trading products. Levels of species diversity of cartilaginous fish in Indonesia are very high, and also Indonesia is listed as one of the countries that use elasmobranch resources the highest in the world. Generally, this study aims to identify each species of H. uarnak species complex through molecular approaches. While specifically, this study aims to estimate the evolutionary process of species divergence and to determine the relationship between species. The methods were used in this study included field sampling, sample collection, and specimen identification, collection of genetic samples, analysis of genetic samples and data analysis . Size polymorphism nuclear DNA markers (intron EPIC) were used. Polymorphism alleles translated into genotypes and alleles frequency of five introns loci. The results of Bayesian analysis and Correspondence Analysis (CA) produced informative diagram of the population structure showed 4 different clusters. Cluster 1 and 4 were H. leoparda, Cluster 2 indicated as H. undulata and the Cluster 3 was H. uarnak. Cluster 1 was a variant of Cluster 4, in this time called as H. leoparda var.1. Separation of four clusters according to nuclear DNA need to be proved by mitochondria DNA maker by cytochrome c oxidase subunit I (COI) and cytochrome b (cyt b). Molecular approaches were using mitochondrial DNA gene cytochrome c oxidase subunit I (COI) and cytochrome b produced 4 main groups (Group I, II, III and IV). Both of these molecular approaches showed each individual of groups were in consistent clade and the main group. Hence the H. uarnak species complex in Indonesian waters were divided into 4 main groups, and each was a particular species. The Group I and IV were the two group species that have been released as H. leoparda and Group I was H. leoparda var. 1 identified as cryptic species. Group II was one individual who grouped as H. undulata. Group III was one of other group that identified as H. uarnak and in accordance with the morphological characteristic through spotting pettern. Morphological approach to identified the stingrays of Himantura uarnak species complex clearly less accurate than the molecular approaches. Morphological approach should not be used to identify a species complex in stingrays without helped by other approaches.
Keyword: Himantura uarnak species complex, intron EPIC, cyt b, COI, spotting pattern