Abstract
The objective of the study is to get the best dose of boiler ash and tofu wastewater to increase the growth of palm oil seedlings in the nurseries. The study used a completely randomized design in factorial with three replications. The first factor is the dose of boiler ash consisting of four levels, namely 0 g, 300 g, 350 g, 400 g, and 450 g per polybag. The second factor is the concentration of tofu wastewater, which consists of four levels, namely 0%, 60%, 80%, 100% per polybag. The results showed that the interaction between boiler ash and tofu wastewater had a significant effect on the growth of palm oil seedlings in the nurseries. Interaction between boiler ash doses 350-450 g per polybag with tofu wastewater concentration 80-100% per polybag can increase seedling height, shoot diameter, root volume, and dry weight of palm oil seedlings.
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