The Utilization of Leachate as a Nutrient Source for Ixora Plants

Abstract Leachate, water originating from waste piles, is rich in organic content, making it appropriate for use as liquid organic fertilizer. However, raw leachate contains heavy metals that may harm plants and soil. To address this, the leachate is treated through fermentation using EM4 microorganisms and wastewater, which acts as a nutrient source for the microorganisms. This study explored the potential of treated leachate for plant growth, particularly for Ixora or Asoka plants, which are valued for their ornamental and fragrant qualities. Leachate samples from Batuan landfill were diluted to lower their concentration and tested in 9 reactors, each duplicated. Different concentrations of leachate and volumes of wastewater were applied as variables. Observations included Ixora plant growth (height, number of leaves, and flowering time), soil pH, soil moisture, heavy metal content, and Cation Exchange Capacity (CEC). Results indicated that treated leachate meets the Ministry of Agriculture’s standards in Indonesia (No. 70/2011), rendering it viable as a liquid organic fertilizer. The treatment combination A2 (300 mL leachate at 1.33% concentration with 600 mL wastewater) yielded the most significant results, with plant height increasing by 2.5 cm and leaf count increasing by 18. Treatment A1 (300 mL leachate at 1% concentration with 600 mL wastewater) was the most effective for flowering, with plants blooming 9 days after application. The study demonstrates that treated leachate, when combined with appropriate fermentation processes, can be an effective, sustainable organic fertilizer. It—promotes plant growth while improving soil quality, offering a practical solution for waste management and agricultural productivity.