Judul: Effect of Variety and Spacing Patterns on Growth and Production of Corn (Zea mays L.)
Abstrak: Jagung merupakan salah satu komoditas yang sangat penting di Indonesia. Produksi jagung di Indonesia belum dapat memenuhi kebutuhan nasional. Peningkatan produktivitas dapat dilakukan salah satunya dengan pengaturan jarak tanam dan pemilihan varietas yang tepat. Penelitian ini bertujuan untuk mengetahui pengaruh varietas dan pola jarak tanam yang berbeda serta interaksinya terhadap pertumbuhan dan produksi jagung. Perlakuan yang digunakan yaitu varietas yang terdiri dari varietas jagung hibrida Poneer 27 dan varietas jagung bersari bebas Bisma, dan jarak tanam yaitu jarak tanam jajar legowo sistem double row dan jarak tanam persegi yang masing-masing terdiri dari 2 taraf. Rancangan percobaan yang digunakan yaitu split-plot dengan rancangan lingkungan RKLT, yang diulang sebanyak 3 kali. Varietas jagung Pioneer 27 menunjukkan nilai rata-rata komponen hasil, hasil biji kering ubinan, dan produktivitas yang lebih tinggi (6,12 ton ha-1) dari Bisma (4,62 ton ha-1). Perlakuan jarak tanam tidak berpengaruh nyata terhadap peubah pertumbuah vegetatif tanaman, namun jarak tanam 80 cm × 25 cm menghasilkan bobot tongkol tanpa klobot dan bobot 1000 butir tertinggi. Rata-rata produktivitas dari semua jarak tanam adalah 5,37 ton ha-1., Corn is one of the most important commodities in Indonesia. Corn production in Indonesia has not been able to meet national needs. One of the ways to increase productivity is by setting the spacing and selecting the right varieties. This study aims to determine the effect of different varieties and spacing patterns and their interactions on maize growth and production. The treatments used were varieties consisting of Poneer 27 hybrid corn varieties and Bisma-free pollinated corn varieties, and the spacings were row spacing with double row system and square spacing, each consisting of 2 levels. The experimental design used was a split-plot with an RKLT environmental design, which was repeated 3 times. The Pioneer 27 maize variety showed a higher average yield component, dry grain yield, and productivity (6,12 ton ha-1) than Bisma (4,62 ton ha-1). Spacing treatment had no significant effect on plant vegetative growth variables, but 80 cm × 25 cm spacing resulted in the highest cob weight without cob and 1000 grain weight. The Pioneer 27 maize variety has a higher dry grain yield per tile and productivity than Bisma. The average productivity of all spacings is 5.37 tons ha-1.
Keyword: plant density, maize varieties, vegetative growth, yield components

Judul: The Effect of N Doses Fertilizer and Varieties on Corn Growth and Production in Saturated Soil Culture in Rice Fields
Abstrak: Jagung (Zea mays L.) merupakan komoditas pangan kedua setelah beras yang berperan sebagai sumber karbohidrat. Peningkatan konsumsi jagung perlu diseimbangi dengan peningkatan produktivitas. Penelitian bertujuan mengetahui pengaruh dosis pupuk N dan varietas terhadap pertumbuhan dan produksi jagung pada budidaya jenuh air di lahan sawah. Penelitian menggunakan rancangan percobaan RKLT dengan dua faktor yaitu varietas dan dosis pupuk N. Faktor varietas terdiri atas dua taraf yaitu jagung Sukmaraga dan Pioneer 27. Faktor dosis pupuk N terdiri atas 0 kg N ha-1, 90 kg N ha-1, 135 kg N ha-1, dan 180 kg N ha-1. Hasil penelitian menunjukkan bahwa faktor varietas menunjukkan hasil yang berbeda di awal pertumbuhan yaitu pada karakter tinggi tanaman, diameter batang, dan jumlah daun, serta bobot basah akar. Selain itu terdapat perbedaan pada komponen hasil yaitu pada karakter diameter tongkol, jumlah baris biji per tongkol, dan bobot 100 biji. Dosis N 180 kg N ha-1 memberikan hasil terbaik untuk semua karakter pertumbuhan dan produksi namun tidak berbeda nyata dengan dosis N 135 kg N ha-1. Tidak terjadi interaksi antara faktor varietas dan dosis N., Corn (Zea mays L.) is the second food commodity after rice which acts as a carbohydrate source. Increased consumption of corn needs to be balanced with productivity. This study aims to determine the effect of N fertilizer dosage and varieties on the growth and production of maize in saturated soil culture in paddy fields. This study used an Randomized Complete Block design (RCBD) with two factors, namely the variety and dose of N fertilizer. Variety factors consisted of two levels, namely Sukmaraga and Pioneer 27. The dosage factor for N fertilizer consisted of 0 kg N ha-1 , 90 kg N ha-1, 135 kg N ha-1, and 180 kg N ha-1. The results of this study indicated that the variety factor showed different results at the character of plant height, stem diameter, number of leaves, and root wet weight,the ear diameter, number of seed rows per ear, and the weight of 100 seeds. The N dose of 180 kg N ha-1 gave the best results for all growth and production characters but was not significantly different from the N dose of 135 kg N ha-1. There was no interaction between the variety factor and the N dose.
Keyword: Nitrogen dose, Pioneer 27, Saturated soil culture, Sukmaraga

Judul: Sintesis dan Pencirian Senyawa 4-Dodekanadioilbis(1-fenil-3-metil-5-pirazolon) sebagai Ionofor untuk Penentuan Ion Lu3+ dengan Teknik Elektrode Selektif Ion
Abstrak: Ion selective electrode (ISE) as an alternative potentiometric method is used widely in determining Lu3+. The success of this method depends on the ionophor used on the ISE. The compound of 4-dodecanedioylbis(1-phenyl-3-methyl-5-pyrazolone) or H2DdBP as pyrazolone derivatives will be used as ionophor on ISE-Lu3+. H2DdBP had been successfully synthesized by Jensen’s method. This method involved reaction of 1-phenyl-3-methyl-5-pyrazolone and dodecanedioyl chloride in basic condition. A compound was produced as a solid substance and was purified by recrystallization using chloroform-ethanol. High performance liquid chromatogram showed that the compound was pure. The compound was in keto form with melting point range of 150-152ºC. Infrared spectra showed vibration peaks (cm-1) were 3451 (br, OH), 1624 (s, C=O), 1589 (s, phenyl C=C), 1558 (s, pyrazolone ring). Chemical shifts (Hz) for 1H-NMR were 7.81–7.84, 7.43–7.46, 7.26–7.290 (m, 10H, Ph); 2.72–2.75 (t, 4H, (CH2)2); 2.47 (s, 6H, CH3); 1.71–1.76 (m, 4H, (CH2)2); 1.32 (m, 12H, (CH2)6). All of these properties showed the characteristics of H2DdBP. Nernst factor of ISE-Lu3+ for two repetitions were 10.40 mV/decade and 8.60 mV/decade which showed that ISE-Lu3+ had good response in determining Lu3+.
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