Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences Innofarm Jurnal Inovasi Pertanian Jurnal Ilmiah Inovasi
Suharjono Suharjono
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Environmental Science Social Sciences Other

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Blooming Stimulation of Microcystis in Sutami Reservoir Using Nutrients Nitrate and Phosphate in Different ratio Catur Retnaningdyah; Suharjono Suharjono; Agoes Soegianto; Bambang Irawan
Journal of Tropical Life Science Vol. 1 No. 1 (2010)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.1.1.%x

Abstract

Microalgae Cyanobacteria from the genus Microcystis has the potential to bloom in Sutami reservoirs that located in Malang, Indonesia at a particular time. Microcystis is a notorious species because it can produce toxins that are dangerous to other organisms. The objective of this research is to determine the influence of different ratios of Nitrate and Phosphate on the growth of Microcystis in Sutami reservoir. The study was conducted from April to November 2009 and was carried out in situ in the reservoir Sutami with quasi experiment using a completely randomized design. Sutami reservoir water which already contained plankton community therein, including Microcystis were treated with five variations ratio of Nitrate and Phosphate (10, 20, 40, 80, and 160) and untreated water as control. Experiments carried out by using a transparent plastic bag diameter 1 m and 1.5 m long, inserted into the water and be immersed in the water by using bamboo. Calculation of Microcystis abundance and physic-chemical quality of water is done every three days for a month. The results showed that the higher concentration of orthophosphate in the media water of Sutami reservoir have the maximum abundance of Microcystis. Abundance of Microcystis grown in Sutami reservoirs have positively correlated with actual levels of nitrate, nitrite, total phosphate, conductivity, pH, temperature, ratio of Nitrate to Phosphate treatment and water KMnO4 value.Keywords: Blooming Microcystis, the ratio of nutrients Nitrate to Phosphate, Sutami reservoir
The Potency of Trichoderma sp. as A Biocontrol Agent against Fusarium sp. Pathogen of Porang (Amorphophallus muelleri Blume) Tuber Nindi Nazula Fajarini; Rodiyati Azrianingsih; Suharjono Suharjono
Journal of Tropical Life Science Vol. 10 No. 1 (2020)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Porang (Amorphophallus muelleri Blume) has high economic value in Asia. Porang tuber is high in glucomannan and thus becomes one of the exportable food commodities. Porang plants are susceptible to wilt disease caused by Fusarium sp. Trichoderma sp. has the ability to inhibit the growth of pathogenic fungi such as Fusarium sp. This research aimed to study the potency of Trichoderma sp. in controlling the growth of Fusarium sp. Trichoderma sp. was isolated from the rhizosphere soil in A. muelleri plantation, while Fusarium sp. was isolated from A. muelleri tuber infected by Fusarium. The fungi isolates were identified phylogenetically based on the similarity of Internal Transcribed Spacers (ITS) sequence. Both fungi were antagonistically assessed based on the dual culture method. The antagonistic assay showed that the two isolates of Trichoderma had the potency to inhibit the growth of the two isolates of Fusarium. Trichoderma sp. 2 has higher antagonistic potency than Trichoderma sp. 1. Based on ITS sequence similarity, Trichoderma sp. 1 and Trichoderma sp. 2 were identified as Trichoderma longipale and Trichoderma spirale respectively, while both pathogenic Fusarium were identified as Fusarium oxysporum. Trichoderma spirale therefore could be developed as a biopesticide agent in controlling Fusarium oxysporum.
Co-Authors Agoes Soegianto Catur Retnaningdyah Elfrida Ratnawati Fendy Nayogi Holyness Nurdin Singadimedja Nindi Nazula Fajarini Nisa Budi Arifiana Rahmawati Rahmawati Rodiyati Azrianingsih