Actinidia arguta Planch. (A. arguta) is a perennial vine native to East Asia, including Japan, Korea, northern China, and the Russian Far East. The cultivar ‘Autumn Sense’, developed in Korea, has gained attention for its commercial potential; however, its soluble solids content (SSC, °Brix) is highly sensitive to environmental conditions, posing challenges for growers and marketers alike. This study aimed to investigate the relationship between SSC and cultivation environmental factors to support quality optimization of the ‘Autumn Sense’ cultivar. Field data were collected from two farms with contrasting climatic and soil conditions. Variables included temperature, precipitation, soil physicochemical properties, and fruit SSC. Multivariate analyses, including network plots and heatmaps, were used to explore complex relationships among environmental variables and fruit quality. Precipitation emerged as the most influential factor affecting SSC. Notably, precipitation was strongly associated with available phosphoric acid in the soil, suggesting a potential indirect pathway influencing sugar accumulation in the fruit. The results offer insight into the environmental sensitivity of SSC in ‘Autumn Sense’ and provide a practical foundation for site-specific management strategies. This study contributes valuable knowledge for growers seeking to stabilize fruit quality under variable cultivation conditions and may inform broader strategies for climate-adaptive horticulture.

Abstract
Introduction
Materials and Methods
    1. Plant material and experimental design
    2. Soil physicochemical properties
    3. Climatic conditions
    4. Fruit quality assessment
    5. Statistical analysis
Results and Discussion
    1. Environmental conditions at experimental sites
    2. Regional variation in SSC and yield and modeldiagnostics for yield prediction
    3. Multivariate interaction patterns
    4. Network visualization of environmental relationships
    5. Heatmap analysis of variable correlations
Acknowledgement
References

• Si Young Ha(Assistant professor, Department of Environmental Materials Science and Institute of Agriculture of Life Science, Gyeongsang National University, Jinju 52828, Korea)
• Hyeon Cheol Kim(Graduate student, Department of Environmental Materials Science and Institute of Agriculture of Life Science, Gyeongsang National University, Jinju 52828, Korea)
• Jae Kyung Yang(Professor, Department of Environmental Materials Science and Institute of Agriculture of Life Science, Gyeongsang National University, Jinju 52828, Korea) Corresponding author