02 Jan 2018
Fertilizer demand in Indonesia increase for increasing agricultural production.Biofertilizer is organic fertilizer with the addition of specific microorganisms which are expected to reduce the amount of inorganic fertilizer. Carrier material plays an important role in maintaining the viability and storage period. Peat is used as a biofertilizer carrier forÂ a long time. Solid waste of Modified Cassava Flour (Mocaf) which is the remainder of mocaf industry has great potential as a carrier material of good biofertilizers,Â because of its nutrient content. The aim of this study wasÂ determining the potential of mocaf solid waste and its combinations with peat as the carrier in supporting the growth of Nitrogen-fixing Bacteria (NFB) and Phosphate Solubilizing Bacteria (PSB) during the incubationÂ of microorganisms. The experiment was conducted at the Laboratory of Soil Biology and Biotechnology, Faculty of Agriculture of Sebelas Maret University (UNS) using completely randomized design (CRD) with two factors of a carrier and incubation time as the experimental design. ThereÂ wereÂ threeÂ types ofÂ carrierÂ whichÂ have differentÂ combination. The base material were solidÂ wasteÂ ofÂ MocafÂ industryÂ Â andÂ peat.Â All materialsÂ of carrierÂ wereÂ mixed and sterilized, than inoculated by Nitrogen- FixingÂ Bacteria (NFB)Â andÂ Phosphate SolubilizingÂ Bacteria (PSB) and incubatedÂ forÂ 60Â days. TheÂ growth ofÂ bacterias were analyzedÂ every 15Â daysÂ andÂ theÂ chemical compositionÂ ofÂ carrierÂ wereÂ analyzedÂ atÂ the begin and theÂ end ofÂ researchÂ Â (incubation).Â Â Â The results indicated that the incubation time significantlyaffected viability of NFB and PSB. Until 60th day incubation time, still showed the increasing growth of NFB and PSB.
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