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: Evaluasi efek residu zeolit terhadap produktifitas tanah dan produksi beberapa tanaman pertanian
Abstrak: Penelitian ini bertujuan untuk melihat efek residu. pemberian zeolit terhadap produktivitas tanah dan produksi beberapa tanaman pertanian. 1 Penelit ini dilakukan di Yebun Percobaan dan Laboratorium Jusan Tanah, Fakultas Pertanian, IPB, Bogor dari bulan Desember 1988 sampai Pebruari 1990 dalam tiga kali masa tanam. Masa tanam pertama dilakukan oleh Astiana dan Wiradinata dengan menggunakan tanaman Jagung dan kedelai dari bulan Desember 1988 sampai April 1999. masa tanam kedua dilaksanakan dari bulan April 1989 sampa Juli 1989 dengan menggunakan kacang tanah dan masa tanam ketiga dilaksanakan dari bulan Juli 1989 sampai Oktober 1989 dengan menggunakan jagung, yang kemudian dilanjutkan dengan analisis kimia tanah sampai bulan Pebruari 1990. Perlakuan yang diberikan sebelum penanaman pertama adalah penambahan mineral zeolit dengan takaran 0.0. 2.5 dan 5.0 ton/ha (20, 21 dan 22) dan bahan organik dengan takaran 0.0 dan 3.0 ton/ha (Bo dan B₁), sehingga diperoleh enam kombinasi perlakuan (ZOBO, Z₁B0, Z2B0, Z0B1, Z₁B₁ dan Z2B1). Pupuk dasar yang diberikan adalah Urea, TSP dan KC1 dengan pupuk mikro (NH4)6M02024.4H20. CuSO4.5H2O, ZnSO4.7H2O, H3BO3 dan Diberikan juga kapur dengan takaran....
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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