Article Per Year (5 Year)
p-Index From 2020 - 2025
0.659
P-Index
This Author published in this journals
All Journal Bioeksperimen: Jurnal Penelitian Biologi Advances in Tropical Biodiversity and Environmental Sciences Biology Natural Resources Journal
Eko Purnomo
PT. Semen Indonesia (Persero) Tbk
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Environmental Science Veterinary

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Groove Planting System (GPS) Analysis of The Growth of Teak (Tectona grandis) in Ex-Lime Stone mining land Supiana Dian Nurtjahyani; Dwi Oktafitria; Sri Wulan; Ahmad Zainal Arifin; Eko Purnomo
Advances in Tropical Biodiversity and Environmental Sciences Vol 6 No 3 (2022): ATBES
Publisher : Institute for Research and Community Services Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2022.v06.i03.p05

Abstract

The groove planting system (GPS) is one of the modifications in the plant planting system on ex-limestone mining land. The method used in the implementation of the GPS is to create a basin in the form of an elongated groove on the ex-limestone mining land that has not been reclaimed. Tectona grandis can be grown on less fertile land. This is even recommended by the government, where forest areas were set for planting with teak limited to places that are less fertile and steep. The growth of a plant can be influenced by environmental factors and genetic factors. The interaction between these two factors will determine the growth of a plant. The purpose of this study was to analyze the effectiveness of the Groove planting system (GPS) on the growth of teak (Tectona grandis) in limestone ex-mining areas. The method in this research was an experimental method that was carried out in the former limestone quarry of PT Semen Indonesia in 2020. The results showed that the growth of teak seen from the parameters of plant height, bar chart, leaf number, and leaf color increased. For example, leaf color with a conventional system has a scale of 3 with a GPS scale of 5. Conclusion The GPS method is very effective for the growth of teak (Tectona grandis) because there is an increase in growth and color scale in terms of plant height, stem diameter, number of leaves, and leaf color parameters.
TIPE TALUS LICHEN PADA AREA GREENBELT PT. SEMEN INDONESIA (Persero) Tbk PABRIK TUBAN Sriwulan Sriwulan; Dwi Oktafitria; Eko Purnomo
Binar – Biology Natural Resources Journal Vol 1 No 2 (2023)
Publisher : Prodi Biologi Universitas PGRI Ronggolawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.482 KB) | DOI: 10.55719/Binar.2023.2.1.1-5

Abstract

Lichens are organism resulting from symbiosis of algae and fungi. These organisms are often used for monitoring of air quality as bio-indicators. This relates to its ability to respond to the presence of pollutants in the air. Sensitive lichens type, will not be found in locations with polluted air conditions. On the other hand, in locations with polluted environmental conditions, the type of lichen commonly found is tolerant lichen. The response of lichens to environmental conditions can be seen from the lichen body itself which is known as the thallus. This study aims to identify the types of lichen thallus found in the greenbelt area of ​​PT. Semen Indonesia (Persero) Tbk Tuban Factory. Sampling in this study was conducted at 4 locations, namely TLO, GRE, GTI, and VIE. The results showed that the lichens found in this study had thallus with crustose, fructicose, squamulose, and gelatinous types.
Exploration of nyamplung rizosphere nitrogen fixing bacteria in mine reclamation Sriwulan Sriwulan; Tita Dewi Fitriani; Nadia Puspita Maya; Ni'matur Rohmah; Eko Purnomo
Bioeksperimen: Jurnal Penelitian Biologi Vol 10, No 1: March 2024
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/bioeksperimen.v10i1.23011

Abstract

Nitrogen fixing bacteria have the ability to utilize free nitrogen as a nitrogen source for their growth. These bacteria are able to make efficient availability of N- in the soil, so that it can be utilized by plants. The aim of this study was to obtain nitrogen fixing bacteria isolates from the rhizosphere of nyamplung plants in limestone reclamation lands. Isolation and testing of nitrogen fixation ability by nitrogen fixing bacteria was carried out using selective Ashby's Mannitol Agar media. The isolation results obtained 5 isolates on Ashby's Mannitol Agar media. The morphological characters of the colonies of the five isolates showed round and irregular shapes, flat and convex elevations with flat edges, white, cloudy white and clear. Microscopic observation showed that the isolates consisted of gram-positive and negative bacteria with bacilli cell shape. The catalase test showed 4 positive isolates and 1 negative. The conclusion of this study was that 5 nitrogen fixing bacteria isolates were obtained from the rhizosphere of the nyamplung limestone land plant. Isolates 1, 3, and 5 showed the character of the genus Clostridium, isolate 2 led to the genus Bacillus, and isolate 4 had the same character as the genus Klabsiella.
Co-Authors Ahmad Zainal Arifin Dwi Oktafitria Dwi Oktafitria Nadia Puspita Maya Ni'matur Rohmah Sri Wulan Sriwulan, Sriwulan Supiana Dian Nurtjahyani Tita Dewi Fitriani