Judul: Perlakuan berbagai taraf kadar air terhadap pertumbuhan bunga matahari (Helianthus annuus L.) pada tanah paleudult tipik Parung dan hapludert tipik Ngawi
Abstrak: Ketersediaan air merupakan faktor utama dalam upaya mencapai produktivitas lahan kering yang maksimum. Penelitian ini bertujuan untuk mengetahui pengaruh tipe mineral liat dan perlakuan berbagai taraf kadar air terhadap pertumbuhan bunga matahari. Penelitian ini menggunakan dua jenis tanah, yaitu Paleudult Tipik Parung yang mempunyai tipe mineral liat 1:1 dan Hapludert Tipik Ngawi yang mempunyai tipe mineral liat 2:1. Kadar air diberikan 5 taraf pada masing-masing jenis tanah, yaitu 70%, 80%, 90%, 100%, dan 110% dari kapasitas lapang. Rancangan percobaan yang digunakan adalah rancangan faktorial 2 x 5 di dalam acak lengkap. Untuk membandingkan pengaruh masing-masing perlakuan tersebut dilakukan uji Beda Nyata Terkecil. Pada tahap awal dilakukan pengukuran kapasitas lapang dengan metoda Alhricks. Kemudian dilanjutkan dengan penanaman bunga matahari di rumah kaca, pengukuran tinggi tanaman dilakukan pada setiap minggu. Setelah tanaman mencapai pertumbuhan vegetatif maksimum, tanaman tersebut dilayukan dan diukur kadar airnya. ..dst
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Judul: Penetapan Kadar Air Kapasitas Lapang dengan Metode Alhricks, Drainase Bebas, dan Pressure Plate pada Berbagai Tekstur Tanah untuk Tanaman Bunga Matahari (Helianthus annuus L.)
Abstrak: Soil water availability is one of the important factors influencing plant growth. Field capacity is an upper limit of available water for plants. Field capacity can be determinated by different methods. The objectives of this research are to compare among methods of field capacity measurement and to observe a response of sunflower growth in the range of field capacity that define with different methods. This research was initiated with field capacity measurement with three diffrent methods, i.e. Alhricks, Free drainage, and Pressure Plate at different soil textures, i.e. clay, sandy clay loam, and sandy loam. Furthermore, sunflower planting with different watering treatment based on field capacity of each mentioned methods was carried out in greenhouse. The research was designed by completely randomized design factorial with three replications. The result showed that soil texture and field capacity method and interaction of both significantly affected a field capacity value. In clay textured soil, watering treatment based on field capacity of each method did not significantly affect on plant height, number of leaves, stem diameter, and dry root biomass but significantly affected on wet root biomass, wet and dry canopy biomass, and root length. The result also showed that different texture will affect growth response of sunflower.
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Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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