Peningkatan Produktivitas Indigofera sp. Sebagai Pakan Berkualitas Tinggi Melalui Aplikasi Pupuk Organik Cair dari Limbah Industri Penyedap Masakan:

Abstract

The food flavor manufacture waste (called sipramin) have a great potential to used as liquid organic fertilizer due to the nutrition contents that needed by plants. The objectives of this research were to evaluate the effect of sipramin as liquid organic fertilizer on soil fertility, re-growth, and herbage productivity of Indigofera sp. for ruminants. This experiment used factorial completely randomized design, the first factor was fertilizer dosages (0, 10, 20 and 40%) and the second factor was fertilization times (30 and 15 days before harvested [dbh]). The observed variables were soil chemical and biological characteristic, re-growth and forage production, and nutritive value of Indigofera sp. for ruminants. An in vitro experiment was carried out to examine the dry matter digestibility (IVDMD), organic matter digestibility (IVOMD), crude protein digestibility (IVCPD), solubility of calcium and phosphorus of Indigofera sp. in rumen liquor. The data were analyzed by analysis of variance. The results showed that the soil nitrogen, number of phosphate resolvability bacteria and Rhizobium sp. were significantly different (P<0.05) on 40% fertilizer dosage than the other treatment. The phosphate resolvability bacteria and available phosphate (P available) of 15 dbh were higher than 30 dbh. Sipramin fertilizer of 40% dosage improved Corganic content and carbon to nitrogen (C/N) ratio value of soil and significantly (P<0,01) increased forage production (leaf and stem). The number of stem and stem weight of 40% sipramin and 15 dbh were higher than the others. The leaf and stem ratio of 15 dbh were higher than 30 dbh. There were no significantly different (P>0.05) on stem diameter, chlorophyll content, neutral detergent fiber and acid detergent fiber, however dry crude protein content (CP) and root nodule were significantly different (P<0.01) on 40% fertilizer dosage than the others. There were interaction between dosage and fertilization time on crude protein and phosphorus content. Crude protein and phosphorus content of 40% sipramin at 15 dbh were higher than the others. IVDMD, IVOMD and IVCPD of 40% were significantly (P<0.05) higher than 0% fertilizer dosage. The quantity of soluble calcium and phosphorus were significantly different (P<0.01) on 40% than 0% fertilizer dosage. The addition of 40% sipramin at 15 dbh fertilization time showed the best result to chemical and biological soil characteristic, re-growth and productivity of Indigofera sp.