Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal BERKALA SAINSTEK JURNAL BIOLOGI PAPUA
Ishak Musaad
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science Materials Science & Nanotechnology Mathematics Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Evaluation of Soil Fertility Status in Shifting Cultivation of Upland Rice in Tanah Merah Village, Warmare District, Manokwari Regency, West Papua Sitti A. Karoror; Ishak Musaad; Siti H. Kubangun
Jurnal Biologi Papua Vol 17 No 2 (2025)
Publisher : Jurusan Biologi FMIPA Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/jbp.4521

Abstract

This study was conducted on the agricultural land of Indigenous Papuan communities in Tanah Merah Village, Warmare District, Manokwari, where shifting cultivation is practiced in conjunction with a subsistence and semi-commercial farming system for upland rice (Oryza sativa). The research employed a descriptive method with a survey technique to determine the locations for composite soil sample collection in shifting cultivation fields planted with upland rice. The results showed that the soil in the study area has a clay texture with a yellowish-red to reddish-yellow color. The soil reaction (pH) is classified as acidic, slightly acidic, and neutral. Organic carbon content ranges from high to low. Total nitrogen content is classified as moderate in the upper soil layer and low in the lower soil layer across all land sections. Total phosphorus and available phosphorus contents are categorized as low to very low. Total potassium content is classified as moderate to low. Cation exchange capacity (CEC) and base saturation (BS) show varied values, leading to a low soil fertility status in the upper and middle land sections. In contrast, the lower land section has a moderate fertility status. The shifting cultivation system contributes to maintaining soil organic matter content. However, to improve land productivity, phosphorus (P) and potassium (K) fertilizers should be applied, along with soil conservation techniques such as terracing or ridging to reduce erosion risk and surface runoff.  
Proximate Analysis of Fish Feed Made from Organic Waste Enriched with Lactobacillus casei and Saccharomyces cerevisiae Sukmawati; Ponisri; Bhertha Mangallo; Ishak Musaad; Nurul Kusuma Dewi; Riman Sangadji
BERKALA SAINSTEK Vol. 14 No. 2 (2026)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v14i2.60009

Abstract

The utilization of organic waste as a raw material for fish feed through fermentation represents an innovative and sustainable approach with the potential to enhance nutritional value while improving cost efficiency in aquaculture production. This study aimed to analyze the proximate composition of fish feed derived from fermented organic waste using Lactobacillus casei and Saccharomyces cerevisiae as probiotic agents. The raw materials included vegetable waste, fruit waste, and fish meal, formulated into two feed variations differing in bran proportion, namely 30% in Feed A and 50% in Feed B. An experimental research design was applied, and proximate analysis was conducted to determine moisture content, crude protein, crude fat, crude fiber, Nitrogen-Free Extract (NFE), and ash content. The results revealed that Feed A contained 4.73% moisture, 5.46% protein, 3.31% fat, 35.69% crude fiber, 33.62% NFE, and 21.92% ash. Meanwhile, Feed B showed 6.39% moisture, 5.83% protein, 1.76% fat, 37.91% crude fiber, 30.95% NFE, and 23.55% ash. These findings indicate that Feed A has a more balanced nutritional composition, characterized by higher fat content and lower crude fiber, suggesting better digestibility and potential feed utilization efficiency. In contrast, Feed B exhibited higher fiber and ash content, which may negatively influence nutrient absorption and feed performance. Overall, the fermentation of organic waste using probiotics demonstrates strong potential to improve the quality of alternative fish feed that is not only cost-effective but also environmentally friendly, supporting sustainable aquaculture practices.
Co-Authors Bhertha Mangallo Nurul Kusuma Dewi Ponisri, Ponisri Riman Sangadji Siti H. Kubangun Sitti A. Karoror sukmawati