KANDUNGAN NITROGEN, PHOSPOR, KALIUM DAN SULFUR PADA PUPUK ORGANIK CAIR (Poe) KOTORAN SAP! SETELAH MELALUI PROSES DIGESTER Dl DESA TAMANAN KECAMATAN SUKOMORO KABUPATEN MAGETAN

Abstract

ABSTRAKTreatment of cattle wastes is one effort that is quite beneficial and can reduce the negative impacts on the environment. One way of utilizing livestock manures or organic materials is through the use of biogas. This is rather appropriate since majority of the population reside in rural areas. Meanwhile, the waste generated out of the biogas digester can be used as liquid organic fertilizer (LOF) with high nutrient contents suitable for plants .Thisexperimental studywasaimedtodeterminethecontentofnitrogen(N),phosphorus(P), potassium(K),andsulphur(S)asaLiquidOrganicfertilizer(LOF).Thisinvestigationwasrunusing one group pretest posttest design. Raw cow dung was processed in biogas digesters ( max 3 m3 ; with detentiontime(t4)of7days,14daysand21 days,andthecontentofN,P,K,Swill bemeasured before and after the process in the digester.In the examination before the process, the N content ( 0.10 o/o ), P content ( 1.13 7o ), content of K ( 0.59 % ) content of S ( 1.19 o/o ). After theT ,14 and 21 days the N content increased from its original state. Thehighestincrementwasatday2t,withalargeincreaseof(41.2%).TheelementP(td)7,!4and 21 days have shown a continuous decline and the highest was on day 2t that reached ( 30.08 o/o ). For elements of K and S for ( td )7 , t4 and 21 days have continuously increased. The highest generation rate of the element K on day 21 reached ( t5.7 o/o ) and S reached ( 43.6 o/o ). It appeared that the longer the process in the digester, the N, K and S contents is increasing although it remained below the standard designated in Permentan 28 / Permentan / OT.140 / 212009. While the P element on the contrary was decreasing and there were indications of the longer the process in the digester the greater the decline.This indicated that the P element much needed by the bacteria in the fermentation process. An increase in the content of N, K and S as a nutrient for plant growth as generated by the biogas digester using raw manure in this study have met the LOF requirements. Effectiveness in lmproving N, P , K and S contents required futher research on the type of starter bacteria to be used, duration of the process ( td ) and the ratio of water and cow dung in order to obtain the most effective and efficient results.