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All Journal Jurnal Biologi Tropis
Situmeang, Doli
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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The Effect of Bokashi from Goat Manure and Human Urine on the Growth of Lettuce (Lactuca sativa L) in Deep Flow Technique (DFT) System Dedi, Ronaldus; Situmeang, Doli; Ricky, Donn Richard
Jurnal Biologi Tropis Vol. 25 No. 1 (2025): Januari - Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i1.8766

Abstract

In the pursuit of innovative agricultural practices, the Deep Flow Technique (DFT) hydroponic system has gained popularity to meet the increasing demand for vegetables, such as lettuce. However, finding effective organic fertilizers remains a challenge. This study aimed to investigate the impact of using bokashi from goat manure and human urine on lettuce growth within the DFT system, comparing it to the commonly used AB Mix fertilizer. The experiment observed growth parameters, including root length, number of leaflets, and leaf width, for a period of 28 days. The results indicated that the AB Mix fertilizer yielded the best growth, followed by a combination of goat manure bokashi and human urine, whereas human urine alone resulted in the lowest growth. Statistical analysis confirmed the significant influence of the fertilizer treatments on plant growth. These findings suggest that while AB Mix fertilizer is the optimal choice, the combination of goat manure bokashi and human urine proves to be a viable alternative for organic fertilizer.
Influence of Light Wavelength on the Growth Performance and Protein Content of Arthrospira platensis Siama, Gabriela Sabatin; Suwitono, Marvel Reuben; Situmeang, Doli
Jurnal Biologi Tropis Vol. 26 No. 2 (2026): April - Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i2.11925

Abstract

Microalgae play an important role in aquatic ecosystems as primary producers and have significant potential as a sustainable source of protein. One of the microalgae with high economic value is Arthrospira platensis, which is rich in bioactive compounds and protein content. Light is a key factor influencing microalgae growth, particularly its wavelength and spectrum, which can affect biomass production and biochemical composition. This study aimed to analyze the effect of different LED light wavelengths (red, blue, and a combination of red–blue) on the growth performance and protein content of Arthrospira platensis. The experiment was conducted in January 2026 using a completely randomized design with three treatments and three replications. The microalgae were cultivated in Walne medium under controlled conditions with continuous aeration for 14 days. Growth was monitored daily, and protein content was analyzed using a UV-Vis spectrophotometer at wavelengths of 280 nm and 260 nm. The results indicated that different light wavelengths significantly influenced the growth and protein content of Arthrospira platensis. The combination of red–blue light showed better performance compared to single wavelengths in enhancing biomass production and protein content. In conclusion, the use of combined LED light spectra can optimize the cultivation of Arthrospira platensis and improve its potential as an alternative protein source
Co-Authors Dedi, Ronaldus Donn Richard Ricky Marvel Reuben Suwitono Siama, Gabriela Sabatin