<![CDATA[Ultisol is a highly weathered soil with low fertility that limits crop productivity. Organic matter amendment improves soil chemical properties; however, the optimal incubation period to ensure full nutrient availability and uptake remains uncertain. This study aimed to determine the effect of incubation duration of vegetable waste compost and chicken manure on N, P, and K uptake and yield of maize (Zea mays L.) in Ultisol, and to identify the most effective incubation period. The experiment was conducted at the Experimental Garden and Soil Chemistry and Fertility Laboratory, Faculty of Agriculture, Universitas Tanjungpura, using a Completely Randomized Design with six incubation durations, namely 1, 2, 3, 4, 5, and 6 weeks and four replications, yielding 24 experimental units. Each unit consisted of 10 kg Ultisol amended with 255 g vegetable waste compost and 225 g chicken manure. Parameters measured included N, P, and K uptake. Data were analyzed by ANOVA and DMRT post-hoc test at 5% significance level. Results showed that incubation duration had no significant effect on nutrient uptake. The highest mean uptake was N 3.14 g/plant, P 2.34 g/plant, and K 2.09 g/plant. Period of 6-week incubation is demonstrated the best overall performance. Keyword: Chicken Manure, Corn, Incubation, Ultisols, Vegetable Waste Compost]]>
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