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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) International Journal Management and Economic (IJME)
Risnawati
Gunadarma University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Materials Science & Nanotechnology Physics

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Effects of Biofertilizer Application and Organic Matter Incubation on Soil Chemical Properties Aisyah; Paranita Asnur; Fitrianingsih; Risnawati
Jurnal Penelitian Pendidikan IPA Vol 11 No 11 (2025): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i11.13342

Abstract

Soil organic matter is essential for maintaining soil fertility and supporting sustainable agricultural production. However, raw organic matter does not directly enhance soil chemical properties without a sufficient decomposition period. This study evaluated the effects of organic matter incubation and biofertilizer concentrations on soil chemical characteristics. The experiment was conducted from June to August 2024 in the Greenhouse Laboratory of Gunadarma Technopark University, Jamali Village, West Java, using a completely randomized factorial design. Treatments consisted of four biofertilizer concentrations (0, 10, 15, and 20 mL/L) and five incubation periods of cow manure (0, 1, 2, 3, and 4 weeks), each replicated four times, resulting in 80 experimental units. The results showed a significant interaction between incubation duration and biofertilizer concentration on soil pH, organic carbon, total nitrogen, C/N ratio, available phosphorus (P₂O₅), and available potassium (K₂O). The four-week incubation combined with 10–20 mL/L of biofertilizer produced the most notable improvements, increasing pH to neutral levels, raising organic carbon and nitrogen contents, achieving an optimal C/N ratio, and enhancing P availability, although K remained low. These findings indicate that combining biofertilizer application with an adequate incubation period effectively improves soil fertility and offers a viable strategy for long-term soil management and agricultural productivity.
ANALYSIS OF THE INFLUENCE OF MACROECONOMIC FACTORS AND THE INDONESIAN SHARIA STOCK INDEX (ISSI) ON THE NET ASSET VALUE (NAB) OF ISLAMIC MUTUAL FUNDS FOR THE PERIOD 2019-2023 Risnawati; Misdiyono; Siti Aisyah
International Journal Management and Economic Vol. 5 No. 2 (2026): May: International Journal Management and Economic
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijme.v5i2.2699

Abstract

The development of Islamic mutual funds in Indonesia offers an attractive alternative for investors and has good potential for the economic sector in the future. However, throughout the period 2019 to 2023, the net asset value (NAV) of Islamic mutual funds experienced significant fluctuations, with a sharp decline in 2021 and 2022. This study aims to examine the influence of various macroeconomic factors as well as the Indonesia Sharia Stock Index (ISSI) on the net asset value (NAV) of Islamic mutual funds, both partially in the short and long term, as well as overall. The economic factors analyzed include inflation, exchange rate, BI rate and gross domestic product (GDP). A quantitative approach using secondary data was adopted in this study. The sampling technique applied is a saturated sample (census), while data analysis is carried out through the Vector Error Correction Model (VECM) model. The results revealed that in the short term, the exchange rate variable has a significant positive influence on the NAV of Islamic mutual funds. However, inflation, BI interest rate, GDP, and ISSI variables do not show a significant influence on NAV in the short term. Conversely, the long-term test results show that the exchange rate, BI interest rate, and GDP have a significant positive effect on the NAV of Islamic mutual funds, while inflation and ISSI do not have a significant effect. In addition, based on the results of the F test, inflation, exchange rates, BI interest rates, GDP, and ISSI variables simultaneously affect the net asset value (NAV) of Islamic mutual funds.
Co-Authors Fitrianingsih Misdiyono Misdiyono Paranita Asnur Siti Aisyah