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All Journal Jurnal Penelitian Karet Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Agus, Yohanes Hendro
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Agriculture, Biological Sciences & Forestry Education Engineering

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PENGARUH ASAM SULFAT SEBAGAI BAHAN KOAGULAN LATEKS TERHADAP KARAKTERISTIK KARET DAN MUTU KARET valentina, Ayu; Herawati, Maria Marina; Agus, Yohanes Hendro
Jurnal Penelitian Karet JPK : Volume 38, Nomor 1, Tahun 2020
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.jpk.v38i1.639

Abstract

Penggunaan koagulan lateks yang tepat mampu menghasilkan karet bermutu baik. Namun, jaminan ketersediaan dan harga koagulan anjuran menyebabkan petani karet beralih menggunakan koagulan non-anjuran, sehingga dalam penelitian ini mencoba meneliti tentang karakteristik morfologi dan mutu karet yang dihasilkan oleh koagulan anjuran asam formiat dan koagulan non-anjuran asam sulfat. Hasil penelitian menunjukkan bahwa bobot basah koagulum asam formiat lebih berat dibandingkan bobot basah koagulum asam sulfat, meskipun waktu koagulasinya lebih cepat dibandingkan waktu koagulasi asam formiat.  Mutu karet yang dihasilkan oleh asam formiat berdasarkan kadar karet kering, kadar abu dan kadar zat menguapnya lebih baik dibandingkan dengan mutu karet yang dihasilkan oleh asam sulfat.Kata kunci: Koagulasi; asam formiat; asam sulfat
PENGARUH ASAM SULFAT SEBAGAI BAHAN KOAGULAN LATEKS TERHADAP KARAKTERISTIK KARET DAN MUTU KARET valentina, Ayu; Herawati, Maria Marina; Agus, Yohanes Hendro
Jurnal Penelitian Karet JPK : Volume 38, Nomor 1, Tahun 2020
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.jpk.v38i1.639

Abstract

Penggunaan koagulan lateks yang tepat mampu menghasilkan karet bermutu baik. Namun, jaminan ketersediaan dan harga koagulan anjuran menyebabkan petani karet beralih menggunakan koagulan non-anjuran, sehingga dalam penelitian ini mencoba meneliti tentang karakteristik morfologi dan mutu karet yang dihasilkan oleh koagulan anjuran asam formiat dan koagulan non-anjuran asam sulfat. Hasil penelitian menunjukkan bahwa bobot basah koagulum asam formiat lebih berat dibandingkan bobot basah koagulum asam sulfat, meskipun waktu koagulasinya lebih cepat dibandingkan waktu koagulasi asam formiat.  Mutu karet yang dihasilkan oleh asam formiat berdasarkan kadar karet kering, kadar abu dan kadar zat menguapnya lebih baik dibandingkan dengan mutu karet yang dihasilkan oleh asam sulfat.Kata kunci: Koagulasi; asam formiat; asam sulfat
The Effect of Various Concentrations of Both Lime Juice and Synthetic Citric Acid Solutions to Protect Capsicum frutescens L. against Yellow Leaf Curl Disease Wagiman, Rejo; Agus, Yohanes Hendro; Simanjuntak, Bistok Hasiholan
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 12 No. 3 (2023): September 2023
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v12i3.676-683

Abstract

The yellow leaf curl (YLC) disease is one of plant disease generally found in chili pepper. The aim of the research was to know various concentrations of lime juice and synthetic citric acids to protect chili pepper (Capsicum frutescens L.) against YLC disease. The research used a randomized completely block design using seven treatments and three replications. The treatments tested were spraying lime juice of 0.1%, 0.2%, and 0.3% volume per volume (v/v); citric acid solution of 0.1%, 0.2%, and 0.3 % weight per volume (w/v). Control was used water only. The data result were analyzed using the honestly significant different test at the 95% confidence level. The treatment of both lime juice and citric acid solutions 0.2% and 0.3% could decreased whitefly population on chili pepper compared with control. The lime juice and citric acid solutions 0.3% was able to reduce the incidence and intensity of YLC disease. Lime juice and citric acid solution of 0.2% and 0.3% increased fruit numbers and fruit weights compared with control. The lower whitefly population decreased disease incidence of YLC (with regression Y = 5.7505x – 48.029). Intensity of YLC disease decreased fruit numbers and fruit weight (correlation value of -0.949 and -0.912). Keywords:  Citric acid, Chili pepper, Gemini virus diseases, Whitefly.
Co-Authors Adi Nugroho Andree Wijaya Setiawan Ayu Valentina, Ayu Bistok Hasiholan Simanjuntak Johan Jimmy Carter Tambotoh Lasmono Tri Sunaryanto Maria Maria Rina Pratiwi Pudja I. A Wagiman, Rejo Yoga Aji Handoko