Open Global Scientific Journal

The Influence of Domestic Soybean Production, Consumption, Prices, and Exchange Rates on Soybean Imports in Indonesia

Indah Pratiwi — 2025-05-01

Background: Domestic soybean production that has not been able to meet national soybean needs is an implication of the decline in soybean harvested area in Indonesia. The opposite condition occurs at the level of demand for soybeans, which increases every year. The soybean import policy is an alternative step for government to overcome the gap between soybean production and consumption in Indonesia. Soybeans in this study are not separated from the type, namely with HS code 1201 (Soya beans, whether or not broken).
Aims: This study aims to analyze the factors that influence soybean imports in Indonesia by using secondary data from 2001 to 2021. The research method used is descriptive quantitative.
Methods: The analysis method used is OLS which is used to determine the regression equation so that the actual value can be know from each independent variable to the dependent variable.
Results: The result of the study found that partially soybean production had no significant effect on soybean imports in Indonesia, soybean consumption had no significant effect on soybean imports in Indonesia, domestic soybeans prices had a significant effect on soybeans imports in Indonesia, the exchange rate had no significant effect on soybean imports in Indonesia, and simultaneously all free variable had a significant effect on soybean imports in Indonesia.

The Role of Vitamin C, Vitamin E and Zinc Supplementation in Enhancing the Resilience of Cultured Fish to Environmental Stress: A Systematic Literature Review

Sheny Permatasari — 2025-06-29

Background: The modern aquaculture industry faces serious challenges from environmental stressors such as temperature fluctuations, deteriorating water quality, and high stocking densities, all of which negatively affect cultured fish's growth and immune competence. Micronutrient supplementation—particularly vitamin C, vitamin E and zinc—has enhanced fish resilience to these stressors.
Aims & Methods: This article was prepared using a systematic literature-review approach on the effectiveness of vitamin C, vitamin E and zinc in strengthening the antioxidant and immune systems of fish. A systematic literature search was conducted for articles published within the last ten years in Scopus‐or SINTA‐indexed journals that examined the effects of these micronutrients on the physiological and immunological performance of cultured fish.
Results: The evidence indicates that vitamin C at 200–400 mg kg⁻¹ feed, vitamin E at 50-100 mg kg⁻¹ feed and zinc at 30–80 mg kg⁻¹ feed elevate antioxidant-enzyme activity, improve tissue histology, and boost non-specific immune responses. Several species have documented positive outcomes, including Oreochromis niloticus, Clarias batrachus, and Rachycentron canadum. Nevertheless, inter-species variability, interactions with other nutrients, and limited molecular-level studies remain challenges. Further research is required to establish optimal dosages, clarify specific mechanisms of action, and design practical supplementation strategies for sustainable intensive aquaculture.

The Effect of Turmeric Powder Supplementation in Feed on Broiler Chicken Performance

Dwi Subakti Prastiyo — 2025-07-14

Aims: This study aimed to evaluate the effect of turmeric (Curcuma longa) powder supplementation in the diet on the production performance of broiler chickens, including feed intake, body weight gain, and feed conversion ratio (FCR).
Methods: The experiment was arranged in a Completely Randomized Design (CRD) with four treatments: P0 (no turmeric powder), P1 (1% turmeric powder), P2 (2% turmeric powder), and P3 (3% turmeric powder), each with three replications.
Results: Statistical analysis showed that turmeric powder supplementation had no significant effect on feed intake (P > 0.05), with average intake ranging from 1262.67 to 1266.33 g/bird. However, turmeric supplementation had a significant effect (P < 0.05) on body weight gain and FCR. The P1 treatment (1% turmeric powder) resulted in the highest final body weight (1172.33 ± 2.01 g/bird) and the lowest FCR (1.0777 ± 0.02), indicating improved growth efficiency and feed utilization. Based on these findings, it can be concluded that turmeric powder supplementation up to 3% in the diet can enhance the growth performance of broiler chickens, with 1% being the most optimal level of supplementation, as there were no significant differences observed among the 1%, 2%, and 3% treatments.

Effect of Vermicompost and Rice Husk Ash as an Organic Growing Media on Rice Seedling and Mat Quality in Tray Nursery

Hastungkoro Widi — 2025-07-15

Background: Efficient mechanized rice transplanting depends on both the structural integrity of seedling mats and the physiological quality of the seedlings. To address this need, enhancing seedling and mat through organic growing media is essential for optimizing mechanized rice transplanting.
Aims & Methods: This study aimed to evaluate the effects of organic amendments on seedling quality (seedling height, biomass, and plant population) and mat characteristics (thickness, weight, rolling score and diameter) in tray nursery. A randomized complete block design with three replications was employed, testing four treatments: alluvial soil without organic amendment (CO), with vermicompost (V), with rice husk ash (R), and with vermicompost and rice husk ash (RV).
Results: The results showed that the rice seedling nursery using a mixture of soil and organic growing media (R, RV, and V) produced better seedling quality compared to CO including seedling height, biomass, and plant population. Regarding mat performance, RV produced the thickest (1.77 cm) and lightest (3.27 kg) mats, aligning with ideal conditions for mechanical transplanting. In contrast, CO mats were the heaviest (4.40 kg), and V produced the thinnest mats (1.40 cm). Rolling quality was highest in CO (score 10), while RV mats showed lower rolling integrity (score 6.7). V treatment achieved the smallest roll diameter (13.87 cm), facilitating better handling and transport. Overall, the results demonstrate that organic amendment selection significantly affects both physiological seedling traits and the physical integrity of seedling mats. The RV treatment offered the most balanced improvement in mat structure and seedling growth, making it a promising option for mechanized rice production.