Nutrient Profile of Liquid Organic Fertilizer and Compost Derived from Cacabean Weed (Ludwigia octovalvis)

Sebelas Maret University, Doctoral Program of Agricultural Science, Faculty of Agriculture, 57126 Surakarta, Indonesia

^* Corresponding author: yoyonriono353@gmail.com

Abstract

Cacabean (Ludwigia octovalvis) has the potential to be utilized as a biomass source for liquid organic fertilizer (LOF) and compost production. This study analyzed the macro- and micronutrient contents of LOF and compost derived from cacabean weed. Nutrient characterization of the LOF was performed for total-N, total-P₂O₅, total-K₂O, total-B, Cu, and Zn using titrimetry, spectrophotometry, flame photometry, and atomic absorption spectrometry. The results showed nutrient concentrations of 0.006% total-N, 0.040% total-P₂O₅, 0.014% total-K₂O, 3.34% total-B, 0.047% total-Cu, and 0.55% total-Zn, all of which were below the minimum quality standards for liquid organic fertilizers set by the Indonesian Ministry of Agriculture (Permentan No. 70/Permentan/SR.140/10/2011). Compost analysis revealed pH (H₂O) of 5.86, C-organic of 52.7%, total-N of 4.68%, total-P₂O₅ of 0.76%, total-K₂O of 3.05%, and moisture content of 47.8%. Compared with the Indonesian Compost Standard (SNI 7763:2018), the compost met the pH requirement but had a moisture content above the recommended level. These findings indicate that L. octovalvis biomass is more suitable for composting than for LOF production, although further optimization is required to improve its fertilizer quality.