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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Teknik
Achmad Gunawan
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Perlakuan Panas Terhadap Sifat Mekanik dan Struktur Mikro Panduan Zirkonium-Alumunium (Al-Zr) Achmad Gunawan; Pawawoi; Eli Y; Iman; Fera; Dini
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 3 No 1 (2004): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jt.vol3no1.236

Abstract

Paduan zirkonium banyak digunakan pada reaktor nuklir karena keunggulan dan sifat mekaniknya serta tahan korosi dalam air pada temperatur tinggi. Salah satu usaha untuk lebih meningkatkan sifat mekanik paduan zirkonium adalah dengan melakukan proses perlakuan panas β-quenching. Dalam penelitian ini telah dilakukan proses perlakuan panas pada logam paduan zirkonium hasil peleburan dengan menggunakan tungku pelelehan busur tunggal (Single Arc Melting Furnace). Proses perlakuan panas dilakukan dengan cara memanaskan paduan zirkonium (Zr-AI) sampai temperatur pemanasan 900oC dengan waktu penahanan 60 menit, kemudian di celup cepat (quenching) dengan menggunakan media air. Hasil analisis dengan menggunakan mikroskop optik menunjukkan bahwa ingot hasil peleburan mempunyai struktur dendrit dan parallel plate dengan Struktur mikro hasil perlakuan panas adalah dendrit. Untuk mengetahui nilai kekerasan paduan Zr-Al dilakukan uji kekerasan mikro vickers. Harga kekerasan hasil perlakuan panas untuk semua paduan berkisar antara 799.33 Hv sampai 890 Hv.
Effect of nitrogen doses on growth and yield of several varieties of tungro-infected rice plant Achmad Gunawan; Purwono; Lubis, Iskandar; Widiarta, I Nyoman
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 51 No. 2 (2023): Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy)
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24831/ija.v51i2.46091

Abstract

Tungro is still a problem in efforts to increase rice production, it can disrupt the stability of rice production if conditions worsen. Plant fertilizer application is an integral part of plant cultivation, especially nitrogen fertilizer. Improper utilization of fertilizers can harm agriculture by increasing plant vulnerability to pests and diseases. Thus, the purpose of the study was to examine the effects of various doses of nitrogen on the agronomic performance of rice plants, as well as their susceptibility to tungro. The research was conducted at the Greenhouse, Sukamandi, and the Muara Experimental Field, Center for Rice Research, Bogor. The experiments, both in the greenhouse and field, used a split-plot randomized complete block design with three replications. The main plots were variety, while the subplots were nitrogen dosage. The results showed that Inpari 36 Lanrang was better than Ciherang and IR64 in terms of plant height, number of tillers, empty grain per clump, leaf greenness, and yield/pot in the greenhouse. While from the field experiment, varieties have different flowering times, plant heights, number of filled grains, number of empty grains, 1,000-grain weight, net assimilation rate, yield/plot, and tungro incidence. The use of nitrogen fertilizer affected flowering time in the greenhouse and affected productive tillers, yield per plot in the field, and the greenness of the leaves of healthy plants. The optimum dose is 167.5 kg ha-1 nitrogen. As a result, it is recommended that controlling tungro disease should involve the integration of fertilizer application that is balanced with the use of resistant varieties.Keywords: agronomic performance, nitrogen rates, plant diseases, resistant varieties, tungro infection
Co-Authors Dini Eli Y Fera I Nyoman Widiarta Iman Iskandar Lubis Pawawoi, Pawawoi Purwono