Judul: The Effect of Harvest Interval on Leave Production and Growth of Three-Leaved Chase Tree (Vitex trifolia L.)
Abstrak: Tanaman legundi (Vitex trifolia L.) merupakan salah satu tanaman herbal yang dimanfaatkan masyarakat sebagai obat tradisional namun masih belum banyak diteliti di Indonesia. Tanaman legundi dipanen daunnya untuk diambil bahan aktifnya, yaitu viteksikarpin sebagai fitofarmaka bahan obat asma. Salah satu teknologi penting dalam produksi tanaman obat seperti legundi adalah penentuan waktu panen yang sesuai agar mendapatkan jumlah bagian tanaman maupun senyawa yang akan dimanfaatkan secara optimal. Legundi adalah tanaman tahunan yang daunnya dapat dipanen berulang. Penelitian ini bertujuan mengetahui pengaruh interval panen terhadap pertumbuhan dan produksi daun legundi, dan menentukan interval panen yang tepat. Penelitian dilakukan di Kebun Percobaan IPB di Cikabayan, Dramaga, Bogor pada ketinggian tempat 240 m dpl dan jenis tanah latosol. Penelitian ini menggunakan RKLT faktor tunggal yaitu interval panen (2, 4, 6, dan 8 minggu sekali) dan diulang sebanyak 4 kali. Penelitian ini menunjukkan tinggi tanaman yang dipanen 6 dan 8 minggu sekali selalu bertambah karena tidak sering dipanen. Interval panen 4 minggu sekali menyebabkan pertumbuhan yang baik dan produksi daun legundi tertinggi. Kata kunci: fitofarmaka, tanaman herbal, tanaman obat, viteksikarpin, Three-leaved chaste tree (Vitex trifolia L.) or legundi is a one of herbal plant that being used by people as a traditional medicine, although there was few research in Indonesia. The leaves are harvested to obtain active ingredient and used as phytopharmaca. The main active ingredient that being used to treat asthma. The appropriate harvest time is important in the production of medicinal plants including for legundi. Legundi is a perennial plant and it can be harvested repeatedly. This research aims to study the effects of harvest interval on growth and production of legundi leaves and determine the appropriate harvest interval to obtain the optimum yield. The experiment was conducted at 240 m above sea level on latosol soil. The environment used a single factor RCBD, namely harvest intervals (every 2,4,6, and 8 weeks) and repeated 4 times. This research showed that plants harvested every 6 and 8 weeks grew well based on its height, but the 4-week interval had the highest yield of legundi leaves. Keywords: herbal plant, medicinal plant, phytopharmaca, vitexicarpin
Keyword: herbal plant, medicinal plant, phytopharmaca, vitexicarpin

Judul: The Effect of Cutting Material Types and Growing Medium Composition on the Growth of Three-leaved Chaste Tree (Vitex trifolia L.) cuttings
Abstrak: Legundi (Vitex trifolia L.) merupakan tanaman obat yang banyak digunakan dalam mengobati berbagai penyakit akan tetapi belum banyak penelitian tentang budi dayanya. Percobaan ini bertujuan mengetahui pengaruh jenis bahan setek dan komposisi media tanam terhadap pertumbuhan setek legundi di pembibitan. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak dengan dua faktor perlakuan. Faktor pertama adalah bagian batang yang terdiri atas setek bagian pangkal, tengah, dan pucuk. Faktor kedua adalah media tanam yang terdiri atas media tanah, campuran media tanah + pupuk kandang sapi (1:1 v/v), dan campuran media tanah + pupuk kandang sapi + arang sekam (1:1:1 v/v). Hasil percobaan menunjukkan bahwa bahan setek berpengaruh nyata pada semua peubah yang diamati. Bagian batang yang baik yaitu bagian pangkal dan tengah. Komposisi media tanam berpengaruh nyata pada semua peubah yang diamati kecuali daya tumbuh dan jumlah tunas. Media tanam tanah memberikan hasil paling rendah. Tidak terdapat interaksi antara jenis bahan setek dan komposisi media tanam pada semua peubah yang diamati., Three-leaved chaste tree (Vitex trifolia L.) is medicinal plant to treat various diseases but there is not so many research about its cultivation. This experiment aims to determine the effect of cutting material types and growing medium composition on the growth of three-leaved chaste tree cuttings in nursery. The experiment used a Randomized Completely Block Design with two factors. The first factor is stem part consisted of basal, middle, and apical. The second factor is growing medium consisted of soil, mixture of soil + cow manure (1:1 v/v), and mixture of soil + cow manure + rice husk charcoal (1:1:1 v/v). The results showed that the cutting material significantly affected on all measured variables. The best stem part is basal and middle stem. The growing medium composition significantly affected on all measured variables except for the variables of the survival rate and shoot number. Growing medium consisted of soil gave the lowest result. There was no interaction between of cutting material types and growing medium composition on all measured variable.
Keyword: adventitious roots, Lamiaceae, rooting media, stem cuttings, vegetative propagation

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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