Judul: Pengaruh jenis pupuk dan dekomposer terhadap pertumbuhan dan produksi padi organik
Abstrak: Percobaan ini dilaksanakan pada bulan November 2011 sampai dengan Maret 2012 di Kebun Percobaan IPB, Cikarawang, Bogor. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak Faktorial, dua faktor dan empat ulangan. Faktor pertama, terdiri atas tiga macam kombinasi pupuk organik, yaitu 15 ton pupuk kandang ayam dengan 5 ton Tithonia diversifolia per hektar, 10 ton pupuk kandang ayam dengan 5 ton Tithonia diversifolia per hektar dan 10 ton pupuk kandang ayam dengan 5 ton jerami per hektar. Faktor ke-2, terdiri atas dua jenis perlakuan yaitu dengan aplikasi dekomposer dan tanpa aplikasi dekomposer. Selain itu juga dilakukan penanaman 3 petak sebagai pembanding dengan perlakuan A (10 ton jerami, 5 ton pupuk kandang ayam dengan 0.4 ton pupuk kandang ayam per hektar yang dicairkan), B (10 ton jerami, 5 ton pupuk kandang ayam per hektar dengan aplikasi dekomposer), dan C (10 ton Jerami dan 5 ton pupuk kandang ayam per hektar). Data diolah menggunakan uji F dan apabila menunjukkan nyata dilanjutkan dengan uji DMRT (Duncan Multiple Range Test) pada taraf kesalahan 5%. Khusus untuk melihat perbandingan antara 6-kombinasi perlakuan dengan 3 pembanding, dilakukan uji t-student.
Keyword: Chicken manure, Decomposer, Organic rice, Rice straw, Tithonia diversifolia

Judul: Pengaruh Jenis Pupuk dan Dekomposer terhadap Pertumbuhan dan Produksi Padi Organik
Abstrak: Field experiment was carried out in Cikarawang, Dramaga, Bogor from November 2011 to March 2012. The objective of the research was to study the effect of fertilizer types and decomposer on growth and yield of organic rice. The experiment used factorial-randomized complete block design with fertilizer combinations (15 ton chicken manure ha-1 and 5 ton Tithonia diversifolia ha-1, 10 ton chicken manure ha-1 and 5 ton Tithonia diversifolia ha-1, and 10 ton chicken manure ha-1 and 5 ton rice straw ha-1) as the first factor and decomposer application (using decomposer and without decomposer) as the second factor. Organic fertilizer types significantly affected root wet weight, nutrient content of P and K in leaves. Rice productivities were not significantly different with fertilizer combinations 15 ton chicken manure ha-1 and 5 ton Tithonia diversifolia ha-1, 10 ton chicken manure ha-1 and 5 ton Tithonia diversifolia ha-1, and 10 ton chicken manure ha-1 and 5 ton rice straw ha-1, they were 2.28, 2.22, and 2.16 ton dry seed ha-1, respectively. Decomposer application significantly affected the number of tillers at 8 week after planting, leaf color at 5 weeks after planting, nutrient content of P in leaves and panicle length. Rice yield with decomposer application and without decomposer were 2.25 and 2.19 ton ha-1, respectively, and they were not different.
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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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