Judul: Karakteristik Dan Pengelolaan Lahan Budidaya Tanaman Krisan (Chrysanthemum Sp.) Di PT. Agrobumi Puspa Sari Sukabumi
Abstrak: Study was carried out at PT. Agrobumi Puspa Sari Selabinta Sukabumi. Aim of this study were to foccused on chrysanthemum land management and different characteristics of grass field, ex-paddy field, ex-unirrigated field and exchrysanthemum plantation in order to improve cultivation system of chrysanthemum. Oral and written information about land management of chrysanthemum cultivation including propagation, land preparation, planting, maintenance (dead seedlings replacing, watering, fertilizing, radiation addition, pest and disease controlling, bud elimination) and harvesting were recuperated. Soil characteristics in this study were pH, exchangeable AI, K, Ca, Mg, Na, Cation Exchange Capacity (CEC), organic-C, total N, available P and micro elements (Fe, Mn, Zn, and Cu).
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Judul: Keanekaragaman Hama dan Penyakit pada Tanaman Krisan (Chrysanthemum spp.)
Abstrak: Ornamental plants are horticultural commodities which have great market demand because of their beauty and aesthetics. One of the important ornamental plants in the world is chrysanthemum. The purpose of this observation was to know the variety of insect pest and pathogen, and also know about intensity and severity on different plant age. Data were collected though interview with farmers and direct observations in the fields. Identification of insect pests and pathogen were conducted in the laboratory. The result showed that diseases found in the fields were white rust (Puccinia horiana), black rust (Puccinia chrysanthemi), fusarium (Fusariumoxysporium), downy mildew, powdery mildew (Oidium chrysanthemi), leaf blight (Helminthosporium sp.), dwarf (Chrysanthemum stunt viroid), pythium (Pythium spp.), and grey mould (Botrytis cinerea). Pests found in chrysanthemum were whitefly (Bemisia tabaci Gennadius.), leaf miner (Lyriomiza huidobrensis Blanchard.), aphids (Aphis gossypii Glover. and Macrosiphoniella sanborni Gillete.), armyworm (Spodoptera litura Fabricius.), dan thrips (Thrips parvispinus Karny.). Insect pests and pathogens management conducted by farmers were organic fertilize rountinely, removing diseased leves, weed control, and pesticide application.
Keyword: plant age, plant pathogen, insect pest, chrysanthemum, ornamental plants

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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