Judul: Induksi pembungaan dan biologi bunga pada tanaman jahe putih besar (Zingiber officinale Rosc.)
Abstrak: Rhizome is usually used for propagation of large white ginger (Zingiber officinale Rosc). The major restriction of using rhizome as material for propagation is pests and diseases spread through rhizome, such as bacterial wilt, leaf pock, rhizome flea, and rhizome flies. True seed is considered as one of potential alternatives breakthrough to be developed. However, true seed production is hindered by limited flower production. Therefore this research was aimed at studying flower induction and flowering biology of large white ginger var. Cimanggu 1. The research consisted of two steps; first, flower induction with low media water content and use of paclobutrazol as two separate experiments and the second was observation on flowering biology. The experiments for flower induction was arranged in completely randomized block design with one factor, i.e. 1) controlling water content of the media at: 48-49, 45-46, 42-43, 39– 40, 36-37, and 33-34 %; and 2) using paclobutrazol as soil drench: 0, 20, 40, 60, 80, 100 ppm. Observation on flowering biology includes pollen viability and stigma receptivity. Result of experiment indicated that low media water content did not induce flowering, but 100 ppm paclobutrazol as soil drench produced more flowers at earlier stage. Pollen viability was highest at 45 min. after blooming (MAB) and declines sharply after 60 MAB. Stigma receptivity presumably occurred at the time when secretion was produced and the stigma tip was transparant, however the precise time is yet to be investigated further.
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Judul: Pengaruh kadar air media dan paclobutrazol terhadap pertumbuhan dan pembungaan jahe (Zingiber officinale Roxb.)
Abstrak: Perbanyakan jahe putih besar (Zingiber officinale Rosc.) umumnya menggunakan potongan rimpang, walaupun pada praktiknya masih menghadapi beberapa kendala. Kendala utama penggunaan rimpang sebagai bahan perbanyakan yaitu rimpang yang mudah terinfeksi penyakit tular benih, rimpang yang voluminous mempersulit penanganan dan masa simpan rimpang yang pendek yaitu hanya sekitar 2-3 bulan. Oleh karena itu, penggunaan biji dipertimbangkan sebagai salah satu alternatif yang potensial dikembangkan untuk mencari bahan perbanyakan lain yang memungkinkan untuk diterapkan di tingkat petani. Secara alamiah jahe jarang berbunga dan tidak berbuah, sehingga upaya untuk menghasilkan biji jahe masih menghadapi kendala. Untuk itulah penelitian ini dilaksanakan dengan tujuan untuk mempelajari pengaruh kadar air media (KAM) dan paclobutrazol terhadap pertumbuhan dan pembungaan jahe putih besar var. Cimanggu I. Penelitian telah dilaksanakan mulai bulan September 2009 hingga Mei 2010 bertempat di Balai Penelitian Tanaman Obat dan Aromatik (Balittro), Cimanggu, Bogor. Penelitian ini terdiri atas dua percobaan terpisah, yaitu induksi pembungaan dengan kadar air media yang berbeda dan induksi pembungaan dengan pemberian paclobutrazol, yang disusun menggunakan Rancangan Acak Kelompok satu faktor. Masing-masing percobaan terdiri atas 6 taraf perlakuan, (1) kadar air media: 45-46 %, 42 – 43 %, 39 – 40 %, 36 – 37 %, 33 – 34 % dan kontrol, (2) paclobutrazol: 20, 40, 60, 80, 100 ppm dan kontrol. Pemberian paclobutrazol dilakukan setiap dua minggu sekali dengan volume siram 500 ml diulang sebanyak 5 kali.
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Judul: Centrality test for Non-Normal And Skewed Population
Abstrak: The t modified 2 test is more robust than t test for skewed popnlation. This test tolerate the population skewness from -1.2 to 1.2 sample size is reather than 25. The sign test robust to the populated skewed population, but the value of the estimated always close to the size of the tcst. Wilcoxon test is not robust to the population skewness. This test is more suittalble for Symmetric population
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