Judul: Pengaruh Curah Hujan terhadap Infiltrasi pada Tanah Terbuka
Abstrak: Keterbatasan dan ketidak teraturan curah hujan sering menjadi sebab penurunan dan kegagalan usaha pertanian . Berbagai usaha perbaikan ditempuh guna meningkatkan intensifikasi lahan. Pengaturan jadwal tanam merupakan salah satu cara dalam usaha ini . selain itu usaha perbaikan fisik tanah juga dilakukan . Penambahan bahan organik (BO) diketahui berpengaruh positif terhadap daya simpan air tanah, sealin juga menambah kesuburan tanah. Penelitian ini bertujuan mempelajari pengaruh curah hujan terhadap pinfiltrasi pada tanah terbuka yang diberibahan organik (kotoran hewan).
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Judul: Hubungan Kadar Air Tanah dengan Curah Hujan dan Sifat Fisik Tanah pada Penggunaan Lahan Berbeda di Kecamatan Warunggunung, Kabupaten Lebak.
Abstrak: Ketersediaan air pada suatu lahan sangat berhubungan dengan karakteristik tanahnya. Karakteristik tanah suatu lahan banyak dipengaruhi oleh jenis tutupan lahan, karena perbedaan jenis vegetasinya. Pengaruh tersebut akibat perbedaan kadar bahan organik yang dihasilkan maupun kedalaman perakaran tanamannya. Kondisi tersebut berpengaruh terhadap kemampuan tanah dalam menyimpan air. Kemampuan tanah dalam menyimpan air hujan, sangat diperlukan oleh petani dalam merencanakan irigasi. Penelitian ini bertujuan untuk melihat pengaruh curah hujan terhadap kadar air tanah. Penelitian dilakukan pada lahan kebun campuran dan lahan terbuka. Pengamatan curah hujan dan kadar air tanah di kebun campuran dan lahan terbuka dilakukan selama 28 hari. Hasil penelitian menunjukkan bahwa pada curah hujan tinggi, kadar air tanah di kedua lahan berada di atas kondisi kapasitas lapang. Kadar air di lahan terbuka lebih tinggi dibanding kebun campuran. Pada curah hujan rendah, kadar air di kebun campuran cenderung lebih tinggi dibanding lahan terbuka. Penurunan kadar air tanah di lahan terbuka relatif lebih cepat dibanding di lahan kebun campuran, sehingga berpeluang lebih cepat membutuhkan irigasi jika tidak segera turun hujan.
Keyword: curah hujan, irigasi, kadar air tanah

Judul: Systematics of Desmos (Annonaceae) in Malesia
Abstrak: Desmos is a woody climbing genus of Annonaceae which has been widely used as traditional medicine in several countries such as China, Indo-China, Thailand, and Peninsular Malaysia to treat dysentery, vertigo, fever, and postpartum. Phylogenetic studies on Desmos showed a close relationship between Desmos and Dasymaschalon. They share similar moniliform monocarpic fruits, but their flowers are different. It has been debated among Annonaceae researchers whether both genera should be treated as the same or distinct genus. Therefore, investigation on the taxonomic delimitation of Desmos species and Dasymaschalon will be necessary. Plastid genome (plastome) identification, leaf epidermal section of Desmos species and Dasymaschalon species, a taxonomic revision of Desmos in Malesia using morphological data, the spatial distribution of Desmos species in Malesia, and morphological and genetic variation in Desmos chinensis population using ISSR marker were used to investigate taxonomic delimitation of Desmos. Plastome study of Desmos chinensis and Dasymaschalon dasymaschalum was carried out to determine the origin, evolution, phylogenomics, and identify marker candidates for Desmos and Dasymaschalon or with other genera in Annonaceae. We discovered that the plastome of Desmos chinensis was circular with the size of 167,677 bp (smaller than Dasymaschalon dasymaschalum), consist of 111 genes, including 78 protein-coding genes, 29 transfer RNAs, and 4 ribosomal RNAs. The plastome showed a typical quadripartite structure, i.e., large single copy (LSC), small single copy (SSC), and two inverted repeats (IRs). The plastome of Dasymaschalon dasymaschalum was 191,488 bp in length, which also exhibited a typical quadripartite structure (LSC, SSC, and two IRs). Desmos chinensis and Dasymaschalon dasymaschalum showed different copies of accD, ndhD, ndhF, rps18, and ycf2. Protein coding genes of rpoB, rpoC1, rbcL, matK, rpl32, infA, and rpl36 were identified based on nucleotide diversity, sequence variability, and parsimony-informative sites. The genes are defined as molecular marker candidates of plastome for phylogenetic, barcoding, and population genetic research. We predicted that Desmos chinensis and Dasymaschalon dasymaschalum separated at ca. 64 million years ago during the Paleocene. Leaf anatomical feature study was carried to support the taxonomic delimitation of interspecific Desmos and intergeneric of Desmos and Dasymaschalon. Leaf anatomy in the paradermal section of 20 taxa (12 species of Desmos, eight species of Dasymaschalon) have been carried out. According to the leaf epidermal section, Desmos and Dasymaschalon are two distinct genera mainly distinguished based on the anticlinal wall undulation of epidermal cells and supported by variation of the crystal type and size. The anticlinal wall undulation of Desmos was almost straight to slightly wavy and never sinuous; meanwhile, Dasymaschalon varies from almost straight to deeply sinusoid. The crystals of Desmos consist of rhombohedral, druse type A, and druse type B crystals, whereas Dasymaschalon has prism, druse type A, druse type B, and druse type C crystals. The recent taxonomic revision using the morphological data was mainly based on the examination of about 1374 specimens from BO, L, WAN, ANDA, SING, SAN, K, P, HUH herbaria. The Desmos species in Malesia consists of eight species: D. acutus, D. chinensis, D. chryseus, D. dunalii, D. pedunculosus, D. subbiglandulosus, two new records: D. lawii and D. macrocarpus, and one
Keyword: Dasymaschalon, Desmoid clade, Magnoliid, plastid genome, phylogenomics analysis