Judul: Determination of Short Term Storage to Maintain Quality of Water Spinach Seeds (Ipomoea reptans Poir.)
Abstrak: Benih yang dipanen saat masak fisiologis akan memiliki mutu yang maksimal. Benih perlu disimpan pada kondisi yang optimum untuk mempertahankan mutunya. Penelitan ini bertujuan menetapkan kondisi simpan jangka pendek benih kangkung sehingga mutunya dapat dipertahankan. Rancangan yang digunakan adalah rancangan acak lengkap faktorial dua faktor dengan 4 ulangan. Faktor pertama adalah warna benih kangkung yaitu hitam, cokelat gelap, dan cokelat terang. Faktor kedua adalah ruang simpan yaitu ruang ber-AC (suhu 16 - 21 °C, RH 55 – 63%) dan ruang kamar (suhu 27,4 – 30,3 °C, RH 64 - 87%). Setiap ulangan terdiri atas 25 benih. Hasil penelitian menunjukkan bahwa benih kangkung darat berwarna hitam dan cokelat gelap telah mencapai masak fisiologis, sehingga viabilitas dan vigor lebih tinggi dibandingkan warna cokelat terang. Benih berwarna cokelat terang belum mencapai masak fisiologis, dan memiliki viabilitas yang rendah. Ruang ber-AC (suhu 16 - 21 °C, RH 55 – 63%) dan ruang kamar (suhu 27,4 – 30,3 °C, RH 64 - 87%) dapat digunakan untuk mempertahankan mutu benih kangkung darat yang dikemas dalam aluminium foil dengan kadar air awal 9% untuk penyimpanan jangka pendek (14 minggu)., The seed quality is highest when it reaches physiological maturity. In order to maintain the quality, the seed needs to be stored in an optimum condition. The study was aimed to determine the proper short term storage conditions for kangkong seeds for maintaining the quality. This study was arranged in a completely randomized design with two factors and repeated 4 times. The first factor was seed coat color i.e. black, dark brown, and light brown and the second factor was the storage condition i.e. air-conditioned room (temperature 16-21 °C, RH 55-63%) and ambient room (temperature 27,4 – 30,3 °C, RH 64 - 87%). Each replicates consisted of 25 seeds. The results showed that the black and dark brown colors of kangkong seeds has reached physiological maturity therefore had higher viability and vigor than that of the light brown seeds. The light brown seed is physiologically immature, and have low viability. For short term storage (14 weeks) air-conditioned room (temperature 16-21 °C, RH 55-63%) and ambient room (temperature 27,4 – 30,3 °C, RH 64 - 87%) were sufficient to maintain the quality of kangkong seeds packed in aluminium foil with 9% initial moisture content.
Keyword: seed coat color, storage condition, viability, vigo

Judul: Determining Seed Storability of Mung Bean Seeds (Vigna radiata) Based on Seed Viability Before Storage
Abstrak: Kacang hijau (Vigna radiata) merupakan salah satu komoditas penting di Indonesia. Mutu benih kacang hijau yang sampai ke tangan petani, sangat menentukan keberhasilan produksi. Benih yang disimpan pada ruang terbuka akan mengalami penurunan viabilitas benih dengan cepat sehingga daya simpan benih perlu diketahui untuk memastikan ketersediaan benih yang bermutu. Penelitian ini bertujuan untuk menetapkan daya simpan benih kacang hijau dengan menggunakan suatu peubah viabilitas atau vigor. Penelitian dilaksanakan mulai dari Januari 2023 hingga Agustus 2023 di Laboratorium Penyimpanan dan Pengujian Mutu Benih, Laboratorium Biologi dan Biofisika Benih, serta Laboratorium Uji Mutu Fisiologis, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian dilaksanakan selama 6 bulan periode simpan dengan menggunakan rancangan acak lengkap (RAL) faktor tunggal yang terdiri dari 10 lot berupa varietas yaitu Vima 1 (a), Vima 2, Vima 3 (a), Vima 4, Vima 5, Vimil 1, Vimil 2, Kutilang, Vima 1 (b) dan Vima 3 (b). Pengamatan sebelum simpan meliputi pengamatan uji daya hantar listrik (DHL), uji pemunculan radikula (RE), uji pengusangan cepat (AAT), indeks vigor (IV), dan kecepatan tumbuh (KCT). Pengamatan saat benih disimpan meliputi pengamatan pada kadar air (KA) dan daya berkecambah (DB) yang diuji setiap bulan. Hasil penelitian menunjukkan adanya penurunan viabilitas benih kacang hijau yang disimpan pada ruang simpan terbuka (suhu 27,329,5 oC dan RH 6173%) dan disimpan dalam kemasan plastik polypropylene 0,8 mm dengan kadar air awal 7,1510,01%. Penetapan daya simpan benih dapat dilakukan dengan menguji daya berkecambah benih kacang hijau sebelum benih disimpan (x) dengan persamaan y = 0,1950x - 13,05, untuk y = daya simpan (bulan). Metode ini dapat digunakan pada penyimpanan jangka pendek untuk tujuan komersial., Mung beans (Vigna radiata) are one of the important commodities in Indonesia. The quality of the mung bean seeds that reach the hands of farmers is crucial to the success of the harvest. Seeds stored in open spaces will experience rapid decrease in seed viability, so the storage capacity of seeds needs to be known to ensure the availability of quality seeds. This research aims to determine the storability of mung bean seeds using a viability or vigor variable. The research was carried out from January 2023 to August 2023 at the Seed Storage and Quality Testing Laboratory, Biology and Biophysics Seed Laboratory, and Physiological Quality Testing Laboratory, Department of Agronomy and Horticulture, IPB University. The research was carried out for 6 month storage period using a single factor Completely Randomized Design (CRD) consisting of 10 lots of the variety, namely Vima 1 (a), Vima 2, Vima 3 (a), Vima 4, Vima 5, Vimil 1, Vimil 2, Kutilang, Vima 1 (b), dan Vima 3 (b). Observations before storage included observations the electrical conductivity test, radicle emergence test (RE), accelerated aging test (AAT), vigor index, and growth rate. Observations when seeds were stored included observations on moisture content and germination capacity which were tested every month. The results showed a decrease in the viability of mung bean seeds stored in open storage (temperature 27.329.5 oC and RH 6173%) and stored in 0.8 mm polypropylene plastic packaging with an initial moisture content of 7.1510.01%. Determining seed storability can
Keyword: mung bean, seed storage period, viability, vigor

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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