PENGARUH DEKOMPOSISI BAHAN ORGANIK ECENG GONDOK (Eichhornia crassipes (Mart) Solms, 1824) TERHADAP NITRAT (NO3) DAN TOTAL BAKTERI PADA SKALA LABORATORIUM

Abstract

Eceng gondok (E. crassipes) menjadi salah satu permasalahan yang serius pada kondisi perairan di Rawa Pening. Bahan organik dalam perairan memerlukan proses perombakan melalui dekomposisi. Penelitian ini bertujuan untuk mengetahui pengaruh dekomposisi bahan organik eceng gondok (E. crassipes) terhadap NO₃ dan total bakteri. Penelitian dekomposisi bahan organik eceng gondok ini mengacu pada penelitian eksperimental dengan Rancangan Acak Lengkap (RAL) terhadap perlakuan kadar 80%, 60%, dan 40%. Data dikoleksi dengan 3 pengulangan selama 5 kali dengan periode satu minggu. Data yang diukur meliputi kandungan bahan organik, nitrat (NO₃), total bakteri, suhu, pH air, dan DO pada setiap wadah percobaan penelitian. Penelitian ini dilaksanakan pada bulan Januari 2015 di Laboratorium Pengelolaan Sumberdaya Ikan dan Lingkungan FPIK UNDIP Tembalang, Semarang. Hasil penelitian adalah dekomposisi eceng gondok memberikan pengaruh yang berbeda terhadap bahan organik air, total bakteri, dan NO₃. Pengaruh bahan organik pada kadar 80% lebih dari 60%, lebih dari 40%. Pengaruh terhadap total bakteri pada kadar bahan organik 80% lebih dari 60%, lebih dari 40%. Dekomposisi eceng gondok pada kadar bahan organik 80% menghasilkan kelebihan NO₃, sedangkan dekomposisi eceng gondok dengan kadar bahan organik 60% dan 40% hasil NO₃ cenderung menurun.

Water hyacinth (E. crassipes) became one of the serious problems to the water conditions in the Pening Swamp. Organic matter in the water needs recast process through decomposition. This study aimed to determine the effect of organic matter decomposition hyacinth (E. crassipes) to NO₃ and total bacteria. This research on decomposition of organic matter hyacinths refers to experimental studies with completely randomized design (CRD) of the treatment levels 80%, 60%, and 40%. Data collected by 3 repeated for 5 times with a period of one week. Measured Data includes organic matter content, nitrate (NO₃), total bacteria, temperature, water pH, and DO in each of container experimental research. This study was conducted in January 2015 in the Laboratory of Fisheries Resources Management and Environment FPIK Tembalang Diponegoro, Semarang. The results showed that the decomposition of water hyacinths give a different effect in water organic matter, total bacteria, and NO₃. Effect of organic material at the rate of 80% more than 60%, more than 40%. Effect of total bacterial content on organic matter level of  80% more than 60%, more than 40%. Decomposition of water hyacinth on organic matter level of 80% has excess NO₃, while the decomposition of water hyacinths with organic matter levels of 60% and 40% of the NO₃ tended to decline.