Judul: The Effect of the Combination of Coconut Water and GA3 on the Grow of Coconut Orchids (Maxillaria tenuifolia)
Abstrak: Maxillaria tenuifolia merupakan tanaman anggrek yang memiliki ciri khas pada bunganya yang beraroma manis. Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi air kelapa dan GA3 terhadap pertumbuhan anggrek kelapa (Maxillaria tenuifolia). Penelitian dilaksanakan pada bulan November 2022 sampai April 2023 di Gunung Batu, Bogor Barat. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) dengan enam perlakuan dan empat ulangan. Perlakuan pertama yakni kontrol (tanpa perlakuan), air kelapa 50% + GA3 50 ppm, air kelapa 60% + GA3 100 ppm, air kelapa 70% + GA3 150 ppm, air kelapa 80% + GA3 200 ppm, air kelapa 90% + GA3 250 ppm. Setelah 16 minggu setelah tanam (MST) dilakukan pengujian kandungan unsur hara N, P, K, dan C. Kombinasi air kelapa dan GA3 berpengaruh nyata pada parameter pengamatan pertambahan panjang daun, pertambahan jumlah pseudobulbs, pertambahan diameter pseudobulbs, pertambahan tinggi pseudobulbs, dan pertambahan tinggi tanaman, namun tidak memberi pengaruh nyata pada parameter pengamatan pertambahan jumlah daun. Pemberian air kelapa dan GA3 menghasilkan nilai C/N rasio yang tinggi sebagai indikator pendorong terjadinya induksi pembungaan., Maxillaria tenuifolia is an orchid plant with a characteristic sweet fragrance flower. This study aims to determine the effect of the combination of coconut water and GA3 on the growth of coconut orchids (Maxillaria tenuifolia). The research was conducted from November 2022 to April 2023 in Gunung Batu, West Bogor. The study used a randomized complete block design with six treatments and repeated four times. The treatments were control (without induction), coconut water 50% + GA3 50 ppm, coconut water 60% + GA3 100 ppm, coconut water 70% + GA3 150 ppm, coconut water 80% + GA3 200 ppm, coconut water 90% + GA3 250 ppm. After 16 weeks after planting (WAP), the nutrient concentration of N, P, K, and C was analyzed. The combination of coconut water and GA3 significantly affected leaf length increase, pseudobulbs increase, pseudobulbs diameter increase, pseudobulbs height increase, and plant height increase. The application of coconut water and GA3 produces a high C/N ratio as an indicator driving the induction of flowering.
Keyword: C/N rasio, hormon, konsentrasi, pseudobulb, unsur hara

Judul: The Effect of Combining Coconut Water with Foliar Fertilizer on the Growth and Flowering of Eria multiflora (Bl.) Lindl.
Abstrak: Eria multiflora merupakan anggrek yang memiliki ciri khas memiliki daun menyerupai daun bambu. Pertumbuhan dan pembungaan anggrek dapat dioptimalkan menggunakan pupuk organik dan pupuk daun. Penelitian ini bertujuan mengetahui konsentrasi air kelapa, pupuk daun dan interaksi air kelapa dengan pupuk daun yang tepat untuk pertumbuhan dan pembungaan anggrek Eria multiflora. Penelitian dilaksanakan pada bulan Desember hingga Juni 2023 di Nursery Gunung Batu, Bogor Barat, Kota Bogor. Penelitian dilakukan dengan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) Faktorial dengan dua faktor. Faktor pertama adalah air kelapa yang terdiri dari 5 konsentrasi yakni 0 (kontrol); 100; 200; 300 dan 400 mL L -1 . Faktor kedua adalah pupuk daun Hyponex yang terdiri dari 5 konsentrasi yakni 1; 1,5; 2; 2,5; dan 2,5 gL-1 . Diperoleh 25 kombinasi perlakuan yang diulang sebanyak 4 kali sehingga terdapat 100 unit percobaan dengan satu satuan percobaan terdiri satu pot yang berisi 3 pseudobulb. Setelah 18 minggu setelah tanam (MST) dilakukan pengujian kandungan unsur Corganik dan N. Kombinasi pemberian air kelapa dan pupuk daun tidak memberikan pengaruh yang nyata kepada seluruh peubah yang diuji mulai dari pertumbuhan hingga pembungaan. Sampai 18 MST tidak diperlukan pemberian air kelapa dengan pupuk daun untuk pertumbuhan dan pembungaan E. multiflora., Eria multiflora is an orchid that is characterized by having leaves that resemble bamboo leaves. Orchid growth and flowering can be optimized using organic fertilizer and foliar fertilizer. This research aims to determine the appropriate concentration of coconut water, foliar fertilizer, and the interaction of coconut water with foliar fertilizer for the growth and flowering of E. multiflora orchids. The research was conducted from December to June 2023 at the Gunung Batu Nursery, West Bogor, Bogor City. The research used a factorial Randomized Complete Block Design with two factors. The first factor is coconut water which consists of 5 concentrations, namely 0 (control), 100-, 200-, 300-, and 400-mL L -1 . The second factor is Hyponex leaf fertilizer which consists of 5 concentrations, namely 1, 1.5, 2, 2.5, and 2.5 g L -1 . 25 treatment combinations were obtained which were repeated four times so that there were 100 experimental units with one experimental unit consisting of one pot containing three pseudobulbs. After 18 weeks after planting (WAP), the C-organic and N were tested. The combination of coconut water and foliar fertilizer did not significantly affect growth to flowering. Up to 18 WAP, no coconut water and foliar fertilizer are needed for the growth and flowering of E. multiflora.
Keyword: coconut water, Eria multiflora, foliar fertilizer, nutrients

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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