Judul: Dinamika Kadar Air Tanah pada Penggunaan Lahan Kelapa (Cocos nucifera L.), Bera, dan Karet (Hevea brasiliensis) di Kebun Percobaan Cikabayan
Abstrak: Dinamika kadar air tanah perlu diketahui untuk memprediksi ketersediaan air bagi tanaman. Faktor fisik tanah seperti struktur, tekstur, bobot isi, dan bahan organik, serta faktor eksternal seperti suhu, curah hujan, dan evaporasi berpengaruh terhadap dinamika kadar air tanah. Dinamika kadar air tanah pada penggunaan lahan kelapa (Cocos nucifera L.), bera, dan karet (Hevea brasiliensis) pada kedalaman 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, dan 40-50 cm dapat diketahui dengan melakukan analisis sifat fisik tanah dan pengukuran lapang seperti kadar air, suhu tanah, evaporasi, dan curah hujan. Hasil penelitian menunjukkan bahwa suhu tanah tertinggi pada pagi hari terdapat pada lahan bera, sedangkan pada siang hari terdapat pada lahan kelapa. Berbeda dengan lahan karet yang memiliki suhu terendah baik pada pagi maupun siang hari. Suhu dan kadar air tanah pada tiga penggunaan lahan menunjukkan fluktuasi terbesar di permukaan tanah dan semakin kecil dengan semakin dalam tanah. Kadar air tanah pada penggunaan lahan kelapa sebelum dan setelah hujan menunjukkan pola yang berbeda, sedangkan kadar air tanah pada penggunaan lahan bera dan karet menunjukkan pola yang hampir sama. Lahan bera memiliki kadar air yang lebih berfluktuasi di permukaan tanah sedangkan pada lahan karet tidak terlalu berfluktuasi. Ketersediaan air tanah pada lahan karet lebih baik dibandingkan dengan lahan kelapa dan bera
Keyword: Curah hujan, evaporasi, penggunaan lahan, sifat fisik tanah, suhu tanah

Judul: Karakteristik Fisik Tanah dan Dinamika Kadar Air Tanah pada Berbagai Penggunaan Lahan (Studi Kasus : Kebun Percobaan Cikabayan)
Abstrak: The water supply in dryland agriculture relies on rain water. Erratic rainfall which is often compounded by high intensity of sun light causes a high evapotranspiration, so that soil water is significanly decrease. Changes in soil water levels is variable depending on land use type and is affected by various factors. The dynamic of soil moisture content is then strongly influenced by rainfall pattern and physical characteristic of soil, where the soil characteristic itself is influenced by land use type. This study aims to determine physical characteristic of soil and dynamic of soil water in various land use and rainfall in The Experiment and Research Garden of Cikabayan, IPB, Dramaga, Bogor. Each land use has different permanent wilting point and soil water level due to difference in density of canopy or the depth of soil layer. The field soil moisture content under oilpalm is still higher than the permanent wilting point although no rain for eight days. It may be caused by the dense canopy of palm trees which can reduce the rate of evaporation. The field soil moisture content under citrus fall below the wilting point at the sixth day after rain (on 10-30 cm layer) and the eighth day after rain (30-50 cm layer), while soil under annual crop is still possibly providing water supply even though no rain for eight days .
Keyword: 

Judul: Isolasi Konstruksi dan Rekombinasi Gen Pengkode Reverse Transcriptase asal Simian Retrovirus-2 (SRV-2)
Abstrak: The availability of reverse transcriptase enzym as a valuable component for Reverse Transcription Polymerase Chain Reaction (RT-PCR) technique has been providing by foreign companies. Therefore, it needs more cost and time to provide it. This study is an early step to produce in house reverse transcriptase rekombinant enzym from SRV-2. The purpose of this study was isolated, constructed, and rekombined SRV-2 reverse transcriptase gene to entry clone and destination vector. Isolation was done by PCR amplification technique using three pairs of primers, which are RT I (3282-3683), RTII (3261-3900), and RTIII (3169-4133). Construction and recombination in this study used Gateway method from Invitrogen. SRV-2 reverse transcriptase gene was isolated in this study with A-549 cell inoculated SRV-2 as source of virus. This gene amplify by PCR technique and resulted specific band for RTI 401 bp, RTII 639 bp, and RTIII 964 bp. Analysis of pENTR/SD/TOPO and pDEST17 indicated SRV-2 reverse transcriptase gene code has already inserted to this plasmid. This result indicated SRV-2 reverse transcriptase gene have isolated, constructed, and recombined to entry clone and destination vector.
Keyword: