Bioscience Methods 2026, Vol.17, No.1, 43-56 http://bioscipublisher.com/index.php/bm 53 Figure 1 Increases in metabolite concentrations and enzyme activities in the K-treated sweet potato are shown in red, and decreases are shown in blue. T is the period of fast biomass accumulation phase; VT is the average biomass accumulation rate during the fast biomass accumulation duration (Adopted from Gao et al., 2021) 7.4 Practice on our farm: Applying potassium fertilizer can significantly increase the yield of fresh potatoes and the quality of commercial potatoes In 2025, the large-scale promotion and application of high potassium fertilizer will be carried out on the Wohua Family Farm in Kaihua. The results show that the fresh potato yield will increase by 35% compared to traditional management without potassium fertilizer, and the commodity potato rate will increase by 22%, resulting in better taste. This indicates that the economic benefits of potassium fertilizer input are significant (Figure 2). Figure 2 Sweet Potato Planting Base of Kaihua Wohua Family Farm (Left: Planting Base; Middle: Commercial Fresh Tuber; Right: Boiled Tuber) (Photo by Yanhong Zhong) 8 Comprehensive Evaluation, Appropriate Dosage Determination and Production Recommendations In response to the goal of prioritizing both yield and quality in sweet potato cultivation, this study has constructed a multi-objective comprehensive evaluation framework to determine the advantages and disadvantages of different potassium application schemes. The evaluation uses membership function and composite index method: Firstly, indicators such as yield, dry matter rate of tubers, and sugar content are standardized separately to eliminate dimensional differences; then, weights for each indicator are set according to production needs (for example, yield and quality weights each account for a certain proportion), and the standardized scores are weighted and summed according to the weights to obtain the comprehensive score for each treatment. In this way, multiple indicators can be integrated into a composite evaluation index, which can be used to visually compare the overall performance of different potassium fertilizer dosage treatments. In this study, the composite index takes into account the balance of fresh potato yield (reflecting economic benefits), dry matter rate, and sugar content (reflecting quality). When a treatment performs well in all indicators, its composite index will be close to 1; if a treatment has high yield but low quality or vice versa, its composite index will be in the middle range due to the
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