Judul: Efek residu kapur dan bahan organik tahun ketiga terhadap sifat fisik dan kimia tanah serta pertumbuhan kedelai (glycine max (L) Merr.) pada latosol coklat kemerahan Cimarias, Sumedang
Abstrak: Penelitian ini bertujuan untuk melihat efek residu kapur dan bahan organik tahun ketiga terhadap sifat fisik dan kimia tanah serta perturnbuhan tanaman kedelai pada Latosol Coklat Kemerahan berteras bangku (tanpa penguat teras) di Desa Cimarias, Kecamatan Tanjungsari, Kabupaten Sumedang, Jawa Barat. Rancangan percobaan yang digunakan adalah rnncangan acak kelompok faktorial, dengan perlakuan residu kapur (K) dan residu bahan organik (B). Residu kapur terdiri dari KO (0 ton/ha), Kl (2 ton/ha), dan K2 (4 ton/ha), sedangkan residu bahan organik terdiri dari BO (0 ton/ha), B1 (2 ton/ha), dan B2 (4 ton/ha). Masing-masing perlakuan diulang 3 kali, sehingga diperoleh 27 satuan percobaan. Parameter yang diamati meliputi sifat fisik tanah (bobot isi, ruang pori total, distribusi ukuran pori, permeabilitas, dan kadar air tanah lapang), kimia tanah (pH H2O, pH KCL, Ca-dd, K­ dd, P-tersedia, N-total, KTK dan C-organik), dan pertumbuhan tanaman kedelai (tinggi tanaman, jumlah polong, dan berat kering brangkasan). Contoh tanah diambil dari lapisan atas (0-20 cm), baik contoh tanah utuh untuk analisa sifat fisik tanah maupun contoh tanah terganggu untuk analisa sifat kimia tanah. Residu kapur tahun ketiga masih mampu meningkatkan permeabilitas dan pori air tersedia, sedangkan residu bahan organik hanya nyata meningkatkan kadar air tanah lapang. Interaksi antara kedua perlakuan tidak nyata memperbaiki bobot isi, ruang pori total, distribusi ukuran pori, permeabilitas, dan kadar air tanah lapang.
Keyword: 

Judul: Pengaruh pemberian kapur dan bahan organik terhadap karakteristik fisik dan kimia tanah serta produksi kedelai (Glycine max (L) Merr) pada latosol coklat kemerahan Cimarias Sumedang
Abstrak: Penelitian ini bertujuan menentukan pengaruh pemberian kapur dan bahan organik terhadap karakteristik fisik dan kimia tanah serta produksi kedelai pada lahan kering. Penelitian dilakukan di Desa Cimarias, Kecamatan Tanjungsari, Kabupaten Sumedang, Jawa Barat. Jenis tanahnya adalah Latosol Coklat Kemerahan (Incep- tisol). Analisa sifat fisik dan kimia tanah dilakukan di laboratorium Jurusan Tanah, Fakultas Pertanian Institut Pertanian Bogor. Perlakuan yang dicobakan berupa pemberian kapur dengan taraf 0 ton/ha (KO), 2 ton/ha (K1), dan 4 ton/ha (K2). Bahan organik yang berupa kotoran kambing diberikan pada taraf 0 ton/ha (BO), 2 ton/ha (B1), dan 4 ton/ha (B2). Penetapan sifat fisik tanah meliputi; analisa kadar air tanah, bobot isi tanah, permeabilitas tanah, stabilitas agregat tanah, dan kurva pF. Penetapan sifat kimia tanah meliputi; analisa pH tanah, C-organik, N-total, KTK, Cadd, Mgads Kdd, P- tersedia dan Alaa. Analisa pendahuluan dilakukan sebelum tanam dan analisa akhir dilakukan setelah panen. Rancangan yang digunakan dalam penelitian ini adalah rancangan acak kelompok faktorial dengan 3 ulangan dengan blok sebagai ulangan. Pengaruh dari..dst
Keyword: 

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