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

Treatment 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 .
This experimental study was aimed to determine the content of nitrogen ( N ) , phosphorus ( P ) ,
potassium ( K ) , and sulphur ( S ) as a liquid Organic fertilizer ( LOF). This investigation was run using
one group pretest posttest design. Raw cow dung was processed in biogas digesters ( max 3 m3 ) with
detention time ( ~ ) of 7 days, 14 days and 21 days, and the content of N r P , K ,Swill be measured
before and after the process in the digester.
In the examination before the process,the N content ( 0.10 % ), Pcontent ( 1.13 % ), content of K ( 0.59
% ) content of 5 ( 1.19 % ). After the 7 , 14 and 21 days the N content increased from its original state.
The highest increment was at day 21, with a large increase of ( 41.2 % ). The element P ( td ) 7 , 14 and
21 days have shown a continuous decline and the highest was on day 21 that reached ( 30.08 % ). For
elements of K and S for ( td ) 7, 14 and 21 days have contmuously increased. The highest generation rate
of the element K on day 21 reached ( 15.7 % ) and 5 reached ( 43.6 % ). 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 I 0T.140 I 2/2009. 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 Pelement 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 LOFrequirements. Effectiveness in improving N, P , K and S
contents required further 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.