Judul: Vegetative Growth Response of Kecapi (Sandoricum koetjape Merr.) Seedlings to The Different NPK Fertilizer Composition in Foliar Application
Abstrak: Kecapi (Sandoricum koetjape Merr.) atau biasa dikenal dengan nama santol merupakan salah satu tanaman penting dalam famili Meliaceae. Kecapi memiliki potensi yang sangat besar untuk dikembangkan karena memiliki beberapa fungsi dan manfaat, namun tanaman ini sudah jarang ditemukan. Salah satu upaya yang dapat dilakukan ialah meningkatkan pertumbuhan pada tahap pembibitan melalui pemupukan. Salah satu metode pemupukan ialah secara foliar yaitu dengan cara menyemprotkan pupuk pada permukaan daun. Penelitian dilakukan berdasarkan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor. Faktor tunggal adalah pengaplikasian jenis pupuk NPK yang terdiri atas lima taraf yaitu A0 (kontrol), A1 (pupuk NPK 15:15:15), A2 (pupuk NPK 32:10:10), A3 (pupuk NPK 15:30:15), dan A4 (pupuk NPK 8:9:39) dengan volume semprot masingmasing 110 ml/tanaman. Hasil penelitian menunjukkan perlakuan bahwa komposisi pupuk NPK 8:9:39 paling berpengaruh tinggi diantara perlakuan lainnya kecuali pada parameter jumlah daun dan indeks luas daun. Nilai pertambahan tinggi tanaman, diameter batang, dan tebal daun pada perlakuan tersebut sebesar 3,10 mm; 0,074 mm; dan 115,10 µm. Sementara kandungan klorofil a dan b sebesar 66,04 µg ml-1 dan 25,15 µg ml-1, serta kandungan glukosa dan fruktosa pada daun sebesar 0,177 µg ml-1 dan 0,044 µg ml-1. Namun, pada parameter jumlah daun nilai yang lebih tinggi terdapat pada perlakuan pupuk NPK 15:15:15 sebesar 15,3 helai daun. Indeks luas daun perlakuan kontrol memiliki nilai yang lebih tinggi sebesar 0,65., Kecapi (Sandoricum koetjape Merr.) or commonly known as santol is one of the important plants in the Meliaceae family. Kecapi has enormous potential to be developed because it has several functions and benefits but it is rarely found. One of the efforts that can be done is increasing growth in nurseries through fertilization. One of various fertilization methods is foliar fertilization, namely by spraying fertilizer on the leaf surface. The study was conducted based on a Completely Randomized Block Design (RKLT) with one factor. The single factor was the application of NPK fertilizer which consisted of five levels, namely A0 (control), A1 (NPK fertilizer 15:15:15), A2 (NPK fertilizer 32:10:10), A3 (NPK fertilizer 15:30:15), and A4 (NPK fertilizer 8:9:39) with each spray volume is 110 ml/plant. The results showed that the composition of NPK 8:9:39 had the highest effect among other treatments, except for the number of leaves and leaf area index. The 8:9:39 NPK fertilizer treatment had the highest increase in plant height, stem diameter, and leaf thickness of 3.10 mm; 0.074 mm; and 115.10 µm. The contents of chlorophyll a and b were 66.04 g ml-1 and 25.15 g ml-1. The content of glucose and fructose in the leaves was 0.177 g ml-1 and 0.044 g ml-1. However, the parameter number of leaves treated with NPK 15:15:15 had a higher value of 15.3 leaves. The leaf area index of the control treatment had a higher value of 0.65.
Keyword: chlorophyll, composition, foliar fertilizer, fructose, glucose

Judul: Kecapi Seedlings (Sandoricum koetjape Merr.) Growth Response Under Different Spectrum and Intensities of Light Emitting Diode
Abstrak: Kecapi (Sandoricum koetjape Merr.) merupakan buah lokal dari famili Meliaceae yang sudah jarang dibudidayakan. Harga pasar buah ini tidak stabil akibat produksi dan kualitas tidak konsisten. Untuk memperbaiki sistem budidaya tanaman buah ini dapat dilakukan dengan modifikasi lingkungan yaitu penggunaan LED (Light Emitting Diode) sebagai cahaya buatan. Penelitian ini bertujuan mengetahui perubahan respons morfologi, fisiologi, dan anatomi terhadap perbedaan spektrum dan tingkat intensitas cahaya LED. Penelitian dilaksanakanberdasarkan Rancangan Acak Lengkap (RAL) dua faktor terdiri dari spektrum LED (ungu dan putih) dan intensitas cahaya (dua dan empat lampu). Hasil penelitian menunjukkan respons morfologi dan fisiologi terbaik pada perlakuan LED putih intensitas tinggi (WH). LED putih intensitas rendah (WL) meningkatkan kandungan klorofil daun dan laju fotosintesis. Respons anatomi terbaik pada perlakuan LED ungu intensitas rendah (PL). Peningkatan lebar daun pada LED ungu intensitas tinggi (PH). Kandungan glukosa menurun pada semua perlakuan dan peningkatan kandungan fruktosa hanya terjadi pada perlakuan LED ungu dengan intensitas rendah., Kecapi (Sandoricum koetjape Merr.) is a local fruit from the Meliaceae family that is rarely cultivated. The market price of this fruit is unstable due to inconsistent production and quality. Improving the cultivation system of this fruit plant can be done by modifying the environment, the use of LED (Light Emitting Diode) as artificial light. This study aims to determine changes in morphological, physiological, and anatomical responses to different spectra and intensity levels of the LED light. The research was conducted based on a two-factor completely randomized design (CRD) consisting of LED spectrum (purple and white) and light intensity (two and four lights). The results showed the best morphological and physiological responses in the treatment of high-intensity white LED (WH). Low-intensity white LED (WL) increased leaf chlorophyll content and photosynthesis rate. The best anatomical response was in the low-intensity purple LED (PL) treatment. Increased leaf width in high-intensity purple LED (PH). Leaf glucose content decreased in all treatments and an increase in fructose content only occurred in the low-intensity purple LED treatment.
Keyword: chlorophyll, glucose, intracellular CO2, photosynthesis, stomata

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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