<![CDATA[Purple eggplant (Solanum mengolena L.) is a horticultural plant grown for its fruit and is a fruit vegetable plant. Alluvial soils generally have diverse textures but are often acidic with low nutrient content, thus becoming an obstacle for the cultivation of horticultural crops such as purple eggplants that require appropriate soil pH and nutrients for optimal growth. This study aims to determine the effect of fly ash and rice husk biochar on the absorption of N, P, K nutrients and yield of purple eggplant plants in Alluvial soil. This study used a Factorial Completely Randomized Design (CRD) with 9 treatment combinations and 3 replications so that there were 27 experimental units. The Fly ash factor (A) consisted of treatments namely A1 (0 g/polybag), A2 (1000 g/polybag), and A3 (1500 g/polybag). The rice husk biochar factor (B) consisted of treatments namely B1 (0 g/polybag), B2 (525 g/polybag), and B3 (1000 g/polybag). The results of the study were that the provision of fly ash and rice husk biochar treatments significantly affected plant dry weight, N uptake, P uptake and fruit weight, but did not significantly affect K uptake and the interaction between the two treatments. Fly ash treatment (0 g/polybag) gave the highest results in dry weight and N uptake parameters. In the yield parameters, the combination of A3B3 treatments (1000 g fly ash) gave an increase in fruit weight that was statistically significantly different so it was chosen as the highest dose because it was more efficient. This combination of treatments could increase plant dry weight by 10.37%, N uptake by 7.57%, P uptake by 37.87%, K uptake by 23.66%, and fruit weight by 95.83%. Keyword: Alluvial soil; fly ash; nutrient uptake; purple eggplant; rice husk biochar]]>
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