This study aims to determine the effectiveness of applying young coconut biochar waste and goat manures to entisol soil on the vegetative growth of tomatoes. The research was conducted at the Biochar Research Center, Agriculture Faculty, Syiah Kuala University, which took place on August to December 2021. This study used a factorial randomized block design consisting of 2 factors. The first factor is treatment of Young Coconut Waste Biochar (B1: control, B2: 18.52 g polybag-1, B3: 37.04 g polybag-1) and the second factor is treatment dose of goat Manure (W), (W1: control, W2: 18.52 g polybag-1, W3: 37.04 g polybag-1 and W4: 55.55 polybag-1). Variables observed in this study were plant height (2, 4, 6, 8 weeks after planting), number of aged branches (2, 4, 6, 8 weeks after planting), net assimilation rate, plant growth rate and relative growth rate. The results showed that the application of young coconut biochar wastes and goat manures had no significant effect on the vegetative growth of tomatoes such as plant height at 4, 6, 8 weeks after planting, number of branches at 4, 6, 8 weeks after planting and net assimilation rate. There was an interaction on plant height at 2 weeks after planting but the application of biochar from young coconut waste and goat manure was not able to increase plant height, while in plant growth rate and relative growth rate the best dose was found in the application of 55.55 g polybag-1 goat manure.

This study aims to determine the effect of young coconut waste biochar and goat manure application on the chemical properties of the entisol. The Biochar Research Station, Universitas Syiah Kuala, conducted the research. This study used a factorial randomized block design consisting of two factors. The first factor was the dose of young coconut waste biochar (0, 5, and 10 t ha-1), and the second was the dose of goat manure (0, 5, 10, and 15 t ha-1). Parameters observed in this study were soil chemical properties analysis of entisol (pH, organic C, total N, available P, and exchangeable K). The results showed that the young coconut waste biochar application could affect the soil’s chemical properties, especially the soil exchangeable K. Young coconut waste biochar application can increase the exchangeable soil K in tomato cultivation land. The application of goat manure did not affect the soil’s chemical properties in tomato cultivation land.