Judul: Pengaruh umur batang bawah jeruk rough lemon (citrus jambhiri lush) dan letak penempelan entris terhadap keberhasilan okulasi jeruk manis varietas ansui (citrus sinensis (l.) osbeck)
Abstrak: Penelitian ini bertujuan untuk mencari umur batang bawah jeruk Rough Lemon (Citrus jambhiri Lush) dan mencari letak penempelan entris yang baik pada okulasi jeruk manis varietas Ansui (Citrus sinensis (L.) Osbeck) dengan batang bawah Rough Lemon. Pada okulasi jeruk biasanya digunakan batang bawah yang memiliki diameter sebesar diameter pensil atau telah berumur 12 bulan. Kemungkinan penggunaan batang bawah yang berumur kurang dari 12 bulan akan lebih menguntungkan produsen bibit. Persatuan antara batang bawah dan batang atas (entris) dapat terjadi pada tempat terjadinya aktivitas pembelahan sel-sel kambium. Jika letak penempelan entris terlalu tinggi dari permukaan tanah maka dapat menyebabkan okulasi gagal karena dikhawatirkan kambium belum aktif membelah pada letak penempelan yang terlalu tinggi. Sedangkan untuk letak penempelan entris terlalu rendah akan rentan terhadap serangan patogen yang berasal dari tanah. Penelitian dilaksanakan pada bulan Maret-Agustus 2002 di Kebun Percobaan Laboratorium limu dan Teknologi Benih Leuwikopo, Institut Pertanian Bogor, Darmaga. Bahan yang digunakan dalam penelitian ini adalah bibit jeruk Rough Lemon berumur 8 bulan dan 12 bulan sebagai batang bawah yang berasal dari Blok Penggandaan Mata Tempel (BPMT) Garut dan entris jeruk manis Ansui sebagai batang atas yang berasal dari Instalasi Pengkajian dan Pengembangan Teknologi Pertanian (IPPTP) Cipaku, Bogor. Entris jeruk manis varietas Ansui ditempelkan pada batang bibit jeruk Rough Lemon berumur 8 dan 12 bulan dengan ketinggian penempelan entris 10, 20 dan 30 cm dari permukaan tanah. Metode okulasi yang digunakan adalah metode forkert…dst
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Judul: Pertumbuhan Bibit Jeruk Keprok (Citrus nobilis) Hasil Okulasi pada Berbagai Media Tanam dan Umur Batang Bawah Rough Lemon (Citrus jambhiri Lush)(
Abstrak: The objective of this research was to study Citrus nobilis budding seed development on various growing medium and age of Citrus jambhiri Lush rootstock. The research was conducted in BPTP experimental garden, Cipaku, Bogor from November 2011 to May 2012. The research was consisted of two experiment, i.e. experiment before budding and experiment after budding. The design of experiment was complete randomized groups with two factors and three replications. The first factor was the growing medium that consists of soil, charcoal husk, sheep’s manure, compost, and vermi-compost. The second factor was the age of Rough Lemon citrus rootstock i.e. 8 , 11, and 14 months. The results showed that the highest wet and dry weight of root were found in the plant which planted in the growing media of (soil: charcoal husk: compost or vermicompost) mixture. The best weight of wet and dry root were found in the age of citrus rootstock 8 months. The best height and diameter of Rough Lemon rootstock were found in the age of citrus rootstock 11 months. The growing media of (soil: charcoal husk: vermicompost) mixture was the best media to Citrus nobilis scion budding development. The best Citrus nobilis scion budding development were found in the age of citrus rootstocks 11 months which adapted during 3 months in the growing media. The best percentage of sprout bud, percentage of dormant bud, increase of length bud, length of bud, length of leaves, and width of leaves were found in the age of citrus rootstock 11 months which adapted during 3 months in the growing media of (soil: charcoal husk: vermicompost) mixture.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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