Optimum Ratio of Fresh Manure and Grain Size of Phosphate Rock Mixture in a Formulated Compost for Organomineral NP Fertilizer

Abstract

The objective of multi years study was to formulate an alternative organic based fertilizer by mixing a fresh manure
and phosphate rock with several different grain sizes conducted in the Field Experimental Station of the University
of Lampung. Both materials of the fresh manure and phosphate rock were obtained from local sources. Five levels
of mixture of fresh manure and phosphate rock, three levels of grain size of phosphate rock, and two kinds of
composting technique were factorial set up. The mixture materials were aerobically composted for 12 weeks. The
results of the first year study show that (a) the optimum ratio of the mixture of fresh manure and phosphate rock was
80% to 20% with the optimum of grain size of phosphate rock < 3 mm; (b) 6-8 weeks of incubation of the mixture
materials has been optimally composted under aerobic conditions of the complete mixture of batch composted
technique; (c) the quality of the final produced compost was considered to fulfill the requirement of standard criteria
of organic fertilizer; while (d) the quantity of compost recovered up to 75.07% which was a reliable quantity of mass
production of organic fertilizer.

[How to Cite: Nugroho SG, Dermiyati, J Lumbanraja, S Triyono, H Ismono, YT Sari and E Ayuandari. 2012. Optimum Ratio of Fresh Manure and Grain Size of Phosphate Rock Mixture in a Formulated Compost for Organomineral NP Fertilizer. J Trop Soils 17 (2) : 121-128. Doi: 10.5400/jts.2012.17.2.121]

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