Judul: Growth, Production and Compatibility Evaluation of Grafted Calina Papaya (Carica papaya L.)
Abstrak: Pepaya (Carica papaya L.) merupakan salah satu tanaman buah tropis yang banyak diminati. Selain rasanya yang manis, buah pepaya mengandung beragam nutrisi penting untuk manusia seperti vitamin A, Vitamin C, asam folat, dan kalium. Salah satu kendala dalam budidaya tanaman pepaya di Indonesia adalah sulitnya mengidentifikasi kelamin tanaman pepaya pada fase vegetative. Sambung pucuk (grafting) merupakan langkah yang banyak digunakan untuk mengatasi masalah tersebut. Penelitian ini bertujuan untuk mengevaluasi efek sambung pucuk tanaman pepaya terhadap pertumbuhan, produksi dan kompatibilitas antara batang bawah dan batang atas. Penelitian ini dilaksanakan pada Kebun Tajur 2 milik PKHT di Tajur, Bogor, mulai dari Desember 2019 hingga Februari 2020 yang kemudian dilanjutkan dengan analisis dalam Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, IPB, mulai dari Juni 2020 hingga Agustus 2020. Penelitian ini mempelajari pertumbuhan tanaman hasil grafting dengan dua macam batang bawah yang berbeda, yaitu : batang bawah pepaya sukma (C-S) dan batang bawah pepaya liar (C-L) dengan batang atas varietas Calina (IPB 1). Secara keseluruhan penelitian ini menggunakan 64 tanaman yang diatur dalam 8 baris tanaman, setiap baris terdiri dari 8 individu tanaman. Sebanyak 5 baris tanaman merupakan tanaman hasil grafting dengan batang bawah pepaya sukma (C-L), dan tiga baris sisanya merupakan tanaman hasil grafting dengan batang bawah pepaya liar (C-L). Data yang diperoleh dianalisis menggunakan uji t-student dengan taraf 5% menggunakan program Minitab 19. Hasil pengamatan menujukkan bahwa tanaman C-L memiliki laju pertumbuhan yang lebih cepat dibandingkan tanaman C-S pada hampir seluruh parameter vegetatif, kecuali lingkar batang sambungan, lingkar batang bawah dan tinggi batang bawah. Tanaman C-L berbunga lebih awal dan memiliki lebih banyak bunga hermafrodit yang mampu memproduksi lebih banyak buah lonjong dibandingkan tanaman C-S. Buah dari tanaman C-L memiliki tingkat kelunakan daging, kekerasan kulit serta nilai Padatan Terlarut Total (PTT) yang lebih tinggi daripada buah yang dihasilkan oleh tanaman C-S. Kedua jenis batang bawah yang digunakan dalam penelitian ini tidak menunjukkan gejala inkompatibilitas., Papaya (Carica papaya L.) or pawpaw is one of the most widely enjoyed tropical fruits. Aside from its refreshing sweet taste, papaya fruit contains different kinds of beneficial nutrients for human body such as vitamin A, vitamin C, folic acid and potassium. One of many hurdles that hinder the papaya production is difficulties to identify plant sexes at the vegetative stage. Among other solutions, grafting is the most popular solution to overcome the aforementioned problem. This research aims to evaluate the effect of papaya grafting on their growth, production and compatibility between rootstock and scion. The research was conducted at PKHT’s 2nd field in Tajur, Bogor, from December 2019 until February 2020 and followed by lab analysis in Post Harvest Laboratory, Department of Agronomy and Horticulture, IPB, from June 2020 to August 2020. Data were analysed by ANOVA using Minitab 19; t-test with 5% level of significance were used to compare the data between two grafted plant groups with different rootstocks, i. e. Sukma (IPB 6) rootstock and wild papaya rootstock. Scion used in this research were from Calina variety (IPB 1). In total, there were 64 grafted plants, arranged in 8 rows with 8 individual plants per row. Five of
Keyword: quality, rootstock, Sukma papaya, TDS

Judul: Analisis Genetik Populasi Setengah Dialel Lima Genotipe Pepaya (Carica papaya L.)
Abstrak: The increase of papaya production is not followed by quality increment so that cannot meet the consumer’s requirements and taste. One strategy to enhance the development of papaya commercially is the supply of superior cultivars based on consumers taste through papaya breeding program. In order to get an appropriate breeding method, basic informations are essential such as general combining ability (GCA), specific combining ability (SCA), heritability, type of gene action, heterosis, linkage between the characters and influence of the characters associated with the yield. The objectives of this experiment were to study the general combining ability and specific combining ability among five genotypes of papaya, the diversity of fruit quality and yield of ten F1 hybrids, to path-analysis the morphological characters associated with yield potential and fruit quality of papaya. Five S3 papaya genotypes resulted by Indonesian Tropical Fruit Research Institute (ITFRI); BT2, Carmina, Dampit, Carmida and Merah Delima, were used as parents for the development of half diallel populations. Five parents and their ten hybrids were planted at Dramaga field experiment, Bogor, 250 asl altitude, using Randomized Completely Design with three replications. Combining ability was analyzed using Grifting Method II diallel analysis procedure. Variance of analysis all variable observed including vegetative and generative growth, fruit production and quality showed significant difference among genotypes tested. Analysis of variance of GCA and SCA for yield component of variable were very significant difference except SCA for lag phase. The characters of fruit weigth, fruit length, and flesh hardness were controled by additive gene action and Dampit can be selected as parent plant with the best GCA for those characters. The characters of flesh thickness, TSS, fruit number, production per plant and the percentage of abnormal fruit were controlled by non-additive gene action because the efect of SCA and non-additive variance were greater than the efect of GCA and additive variance. Hybrids CarminaXCarmida were heterosis and have the highest SCA and mean for flesh thickness and TSS. Hybrids BT-2 X Dampit, Carmina X Dampit and Carmina X Carmida. have the highest SCA and mean for production per plant. The path analysis result showed the character of leaf width can be used as a marker for highest production, but it cannot be used as selection criteria doe to low of narrow sense heritability. The characters of petiole length and fruit weight can be used as selection criteria for further generation and marker for high production.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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