Judul: Efektivitas Cendawan Mikoriza Arbuskula pada Coating Benih Selama Penyimpanan dan Serapan Hara P Tanaman Jagung Manis
Abstrak: The aim of this study was to find out 1) the effect of adhesive on corn seed quality and arbuscular mycorrhizal fungus (AMF) viability during storage, and 2) the effect of AMF coating method and fertilization P on uptake nutrient P, growth and production of sweet corn plants. This study is devided into two experiments: 1) The effect of adhesive on corn seed quality and AMF viability during storage and 2) The effect of AMF coating on the availability of P, growth, and production of corn plants. The first experiment used Split Plot Design with randomized complete. The first factor is storage period (0, 4, 8, 12, 16 weeks) as the main plot and the second factor is adhesive formulation (without coating, sodium alginate + AMF, gum arabic + AMF, and tapioca + AMF) as subplot. The seconds experiment was done using randomized complete block design with two factors. The first factor is the adhesive formulation (without AMF coating, sodium alginate + AMF, gum arabic + AMF, and tapioca + AMF) and the second factor is the dose of P2O5 fertilizer (no fertilizer, 60 kg ha-1 P2O5, and 120 kg ha-1 P2O5). The results showed that seed coating with sodium alginate, gum arabic, and tapioca gave the same effect on the seed germination. The seed germination decreased significantly at 12 weeks after the storage. In the germination speed, the effect of gum arabic and tapioca same with control, whereas germination speed of sodium alginate was lower. The best adhesive to maintaining the germination of AMF was sodium alginate. The germination of AMF can be maintained up to 16 weeks by 70%. Treatment seed coating with tapioca showed that highest Pavailable in the planting medium, P-content in the seed, and AMF infection in the roots after corn is harvested.
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Judul: Pelapisan Benih menggunakan Bakteri Probiotik untuk Mempertahankan Viabilitas Benih Jagung Manis (Zea mays saccharata Sturt.) selama Penyimpanan
Abstrak: This research aims to evaluate the effect of seed coating by Bacillus subtilis, Serratia marcescens, and Fluorescent Pseudomonads to sweet corn seed (Zea mays saccharata Sturt.) during storage. Research was conducted on nested plot design (Nested Design) with the main plot was the storage period ( 0, 3, 6, 9, 12, 15, 18, 21, and 24 week), and the subplot was the coating treatment ( control, Bacillus subtilis, Serratia marcescens, and Fluorescent Pseudomonads). Interaction of seed coating treatment and seed storage period showed significant effect to seed germination, seed vigour index, dry weight normal seedling, seed moisture content, and population of bacteria. The dry weight normal seedling of seed that was coated by bacteria showed the better dry weight normal seedling result than control seeds. Bacillus subtilis can maintain the seed germination up to 64.0%. Serratia marcescens can maintain the seed germination up to 60.0%, while control seed only have 56.7% seed germination. Based on seed germination result seed coating using Bacillus subtilis and Serratia marcescens are the treatment that more potential to be developed. Bacillus subtilis bacteria showed the best ability to survive until 24 week storage period. The population on Bacillus subtilis until 24 week storage period is 14.2 × 104 cfu g-1.
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Judul: Frekuensi Orang Kidal Usia 6-21 Tahun di Setu Babakan, DKI Jakarta.
Abstrak: Handedness didefinisikan sebagai preferensi seseorang dalam penggunaan salah satu tangan, baik kanan maupun kiri, secara lebih dominan untuk melakukan berbagai kegiatan sehari-hari dengan lebih tepat. Handedness dipengaruhi oleh faktor genetik, perkembangan, dan budaya. Orang dengan preferensi tangan kiri biasa disebut dengan kidal. Frekuensi orang kidal selalu lebih rendah dibandingkan orang yang tidak kidal. Terdapat sekitar 10% dari total populasi di dunia yang kidal. Tujuan penelitian ini adalah mempelajari handedness serta menentukan frekuensi orang kidal di Setu Babakan, DKI Jakarta dengan survei kuesioner. Subjek penelitian ini merupakan pria dan wanita yang tinggal di Setu Babakan, DKI Jakarta dengan rentang usia 6-21 tahun. Frekuensi orang kidal di Setu Babakan adalah 4.1%. Frekuensi orang kidal lebih tinggi ditemukan pada pria dibandingkan dengan wanita. Frekuensi orang kidal cenderung menurun pada kelompok usia yang lebih tua. Hal tersebut mengindikasikan tekanan budaya, sosial, dan lingkungan yang memengaruhi handedness.
Keyword: betawi, handedness, kidal