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One of the most profitable agricultural commodities is eggplant. Eggplants also need to be large enough to be eaten as vegetables or vegetables. Eggplant farmers in Indonesia often experience crop failure problems due to excessive use of chemical fertilizers, which make the soil acidic and harmful to the environment. Efforts to help the growth and development of eggplants by using compost. The focus of the research is to determine the effectiveness of various compost fertilizers on the growth and production of eggplant plants. It was carried out from July-September 2023 in Sidorejo Village, Langsa Lama District, Langsa City. In this study, a Non-Factorial Group Random Design (RAK) was used. The observed factor is various compost fertilizers, which consist of 11 composts with 1 variety of Mustang F1 eggplant which is repeated 3 times. The results showed that the treatment of various types of compost fertilizers had a real effect on the plant height parameters of 15 HST and stem diameter of 45 HST. However, it had an insignificant effect on the parameters of average fruit weight, fruit weight, number of fruit planted, average fruit size and production per hectare at harvest time. The benefits of this research are improving the quality of soil fertility, plants becoming fertile, and improving plant quality and productivity. The best result was obtained from K8 (gamal leaf compost), but it was as good as K7 (petai leaf compost). The application of compost fertilizer is effective for all parameters of eggplant plants, except for the treatment of K5 (bagasse compost) because the average value is below 100%, the most effective compost fertilizer is obtained in the treatment of K8 (gamal leaf compost), but it is as good as K4 (straw compost) and K7 (petai leaf compost). To cultivate eggplant plants, it is recommended to use gamal leaf compost, straw compost, petai leaf compost.

Adsorption is a separation process on a particular substance based on the affinity of a compound to a solid. The adsorption process requires an adsorbent as an absorbent material and an adsorbate as an absorbed component. The adsorbent that is often used to absorb Cu2+ ions is silica gel. Silica gel is a rigid gel that is amorphous. In silica gel there are two main bonding groups, namely siloxane and silanol groups which cause silica gel to easily absorb polar molecules, especially water. The purpose of this research is to get the best mass of silica and the effect of the initial concentration of Cu ions on the final concentration of Cu metal. In this study, two operating conditions were varied, namely the mass of silica gel adsorbent 0.4 grams; 0.6 grams; 0.8 grams; 1 gram; 1.2 grams and the initial concentration of Cu metal 3 ppm; 4 ppm; 5 ppm; 6 ppm; 7 ppm. The results of this study showed that the silica content of bagasse ash was 70.97% with a surface area of 283.802 m2/g. The best result of this study reduced the content of copper metal (Cu) by 88% in the condition of silica gel mass of 1.2 grams. The adsorption isotherm shows that the data is more in line with the Freundlich equation. The resulting equation is y = 0.4268x + 0.4969 with an R2 value of 0.9837.