IJASEIT

International Journal on Advanced Science, Engineering and Information Technology, Vol. 10 (2020) No. 4, pages: 1682-1687, DOI:10.18517/ijaseit.10.4.5068

Quality of Enriched Liquid Organic Fertilizer from Dairy Cattle Wastes on Closed Agriculture System

Zainal Muktamar, Fahrurrozi Fahrurrozi, Sigit Sudjatmiko, Mohammad Chozin, Nanik Setyowati

Abstract

Liquid organic fertilizer (LOF) supplementation for solid organic fertilizer can accelerate the availability of plant nutrients. However, the nutrient content of LOF is highly dependent on its sources. The objective of the experiment was to examine the nutrient content of enriched liquid organic fertilizer from dairy cattle wastes. The experiment was conducted at Closed Agriculture Production System Research Station located in Air Duku Village, Bengkulu, Indonesia, at 1054 m above sea level. The experiment was laid out in a Completely Randomized Design with ten treatments and three replications. The treatments consisted of LOF from dairy cattle wastes enriched with Tithonia diversifolia, Ageratum conyzoides, Leucaena leucocephala, and Gliricidia sepium, their combination with phosphate rock, the combination of Tithonia diversifolia, and Ageratum conyzoides, and control. The LOF solution was anaerobically incubated for six weeks. The experiment indicated that during the incubation, solution pH declined for the first two weeks, gradually increased up to week 6. At the end of incubation, control exhibited the highest pH as compared to those with enrichment, indicating that decomposition of green biomass released a considerable amount of hydrogen. Enrichment of LOF considerably increased the contents of C, N, P, K, Ca, and Mg. The addition of phosphate rock to biomasses did not contribute a prominent increase in phosphorus content, possibly due to its low solubility at high pH. LOF enrichment with Tithonia diversifolia and Ageratum conyzoides had the highest N, P, and Mg contents. Therefore, the enrichment is the most potential for LOF production in closed agriculture system.