Judul: Karakteristik infiltrasi tanah pada penggunaan lahan pertanian dan pemukiman di Desa Sukaresmi, Kecamatan Megamendung, Kabupaten Bogor.
Abstrak: The purpose of this research is to analyze soil infiltration characteristic and the main soil physical characters that influence to soil infiltration of several land uses, namely pine forest, vegetable garden, chilli garden, grasses land and resettlement area. Resettlement area has the highest soil bulk density (1,14 g/cm3) producing the lowest total pore space as compared to the others. The pore of resettlement area is dominated by hygroscopic pore (35,57 % v/v), whereas drainage pore is just 4,24 % (v/v). In pine forest, drainage pore is up to 19,85 % (v/v) and hygroscopic pore is up to 24,86 % (v/v). The amount of drainage pore in vegetable garden is 10,28 % (v/v) and its hygroscopic pore is 25,78 % (v/v). Drainage pore in chili garden is up to 17,17 % (v/v) and its hygroscopic pore is up to 17,35 % (v/v). In grasses land, the amount of drainage pore is 14,79 % (v/v) and its hygroscopic pore is 22,98 % (v/v). Infiltration rate of pine forest is the fastest rate, with average rate is up to 600 mm/hour that is classified as very fast rate according to Kohnke’s infiltration rate classification (1968), followed by chilli garden soil (180 mm/hour) and vegetable garden (140 mm/hour) that are classified as fast rate. Infiltration rate of grasses soil is classified as fast rate with average value is up to 136 mm/hour. The lowest infiltration rate occurs at resettlement area, where average infiltration rate is only 7,33 mm/hour that classified as medium-slow rate. The low average of soil infiltration rate at resettlement area is caused by soil compaction. Infiltration rate is mainly influenced by soil porosity, particularly by pore size distribution. At the beginning, infiltration rate is more governed by drainage pore while for constant infiltration rate is more influenced by finest pore, namely capillary pore and hygroscopic pore.
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Judul: Keragaan Infiltrasi Tanah Latosol pada Beberapa Penggunaan Lahan di DAS Ciujung
Abstrak: Land use is an important aspect in maintaining ecosystem sustainability, particularly in the watershed ecosystem. Land use determines to physical, chemical, and biological characteristics of soil. These soil characteristics influence to the growth of plants and the performances of water infiltration into soil. Infiltration is an essential part of the hydrological cycle that has an important role water availability in the soil. Infiltration process have an important role to the distribution of rainfall and control to runoff, flood, erosion and ground water storage and finally will determines the availability of river discharge in dry season. The aims of this research is to assess the performance of soil infiltration in various land use in Ciujung watershed. The study was conducted on three land use types that included plantative forest (HT), dense mixed garden (KCR), and less-dense mixed garden (KCTR). The field observation was done by using the Double Ring infiltrometer method, while the the analysis of the physical and chemical and other soil characteristics were done in the Laboratory of Soil and Water Conservation, Department of Soil Science and Land Resources, Faculty of Agriculture. The results of this research showed that the infiltration rate is strongly influenced by land use. Infiltration rate is the highest and most stable on HT land use, followed by KCR and KCTR. Constant infiltration rate at HT and KCR is belonging to quickly class, while at KCTR is relatively moderate to fast. The magnitude of the rate constant infiltration in HT (23.4 cm h-1) is higher than KCR (13.2 cm h-1) and KCTR (6.0 cm h-1). The high rate infiltration of the soil on the land use of HT support it able to accommodate as much water (6.45 dm3) that higher than at KCR (3,66 dm3) and at KCTR (1.52 dm3). Infiltration rate is influenced by pores with large size (PDSC), while the volume of water infiltration is more influenced by the total porosity of the soil. Besides it is influenced by land use, soil infiltration in the study area is also determined by the physical and chemical characteristic of the soil organic matter, bulk density, total porosity, aggregate stability, macro pores, very fast drainage pore (PDSC), and soil texture.
Keyword: Bogor Agricultural University (IPB), infiltration volume., physical and chemical characterstics of soil, land use, Infiltration rate

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf