Soil contamination by pesticides should be controlled by using soil microbes with the ability to degrade pesticide residues. Microorganisms that have adapted to a particular pesticide could accelerate the degradation process. The present study aimed to select bacteria in soil that could potentially degrade cypermethrin residues. Experiments were carried out in a laboratory and employed soil samples collected from the districts of Demak, Magelang, and Brebes. Each soil sample was initially tested for the presence of bacteria and pesticide residues. Indigenous microbes capable of living in contaminated environments were adapted to cypermethryn and cultured in the laboratory. Experiment was carried out in several stages, namely, (1) isolation and identification of microbes that could degrade cypermethrin, (2) testing of the growth characteristics of isolates in cypermethrin, and (3) determination of cypermethrin residues in cultures. Three isolates, namely Pseudomonas alcaligenes, Bacillus amyloliquenfaciens, and Pseudomonas aeruginosa, were found to decrease cypermethrin residues by up to 95% with fast half-lives and good growth capability. The results demonstrate the potential applications of the isolates in biodegradation processes and remediation of cultivation fields.
Green onion is one of the vegetable commodities that have high economic value and high preferable by the community. Green onion has been exported to the other countries. To increase production it is necessary to use technology to fulfill market demand. The One of technology is adding bacteria in the cultivation of the plant. Bacillus aryabhattai is a bacterium that rapidly colonizes the roots of host plants, promotes plant growth, increases the availability of good nutrition, and has antagonistic effects on plant pathogens. The aim of this research is to know the effect of Bacillus aryabhattai in increasing the population of symbiotic N-stimulating bacteria and to increase crop production. The research was carried out at screen house and laboratory of Agricultural Environment Research Center. The soil was andosol soil from Kaliangkrik Subdistrict of Magelang district. The study was conducted from December 2016 to March 2017. The study design was a randomized block design with 4 treatments and 6 replications. The treatments include control (D1), Bacillus aryabhattai (D2), POC (D3), Trichoderma (D4). The results showed that D2 treatment had a high bacterial population and positively affected plant height, root length, root weight and leaf production. The conclusion of Bacillus aryabhattai giving great influence in multiplying the population of symbiotic N binding bacteria, thus increasing the production of green onion.
Endrin residues are still remain in the land field these compounds are no longer used by farmers and have been banned by the government. This residue can stay in the soil longer and persistant. Microbial enrichment is expected to accelerate the degradation of pesticide residues. Microbes stretcher are Bacillus substillis, Heliothrix oregonensis, Catenococcus thiocycli, and Achoromobacter sp obtained from the preliminary research results from soil isolation of idegenus in LIPI Cibinong Microbiology Laboratory. Soil for the planting medium obtained from the village of Karawang, Regency Cilamaya Wetan, Cilamaya District. The experiment was conducted in the field by using lysimeter at the Experiment Jakenan station from July 2013 to December 2013. The objective of the was to obtain technology of activated carboncoated urea and biochar which enriched microbial indegenus. The experiment was used randomized block design (RCBD) with 3 replications. Plant used are rice. Insecticide residue analysis was carried out in the laboratory in Bogor Balingtan using gas wchromatography (GC), with the SNI method 06-6991.1-2004. The purpose of this study knowing the capabilities of urea coating with activated carbon enrichment microbia in reducing the concentration of residues endrin. The objective were urrea coated activated carbon from coconut shell were enriched with microbes on paddy field can lower pesticide residues of endrin until 33.65%. This carbon as the preferred home. Enrichmentwith microbial indegenuscan improve theeffectivenessof ureacoating biochar andureacoatingactivated carbon coconut shell todecrease concentration of endrin.Keywords: Activated carbon, microbes, decrease residue, paddy field PENDAHULUAN Laju pertumbuhan penduduk Indonesia semakin lama semakin meningkat. Sensus jumlah penduduk Indonesia Desember 2012 mencapai 259 juta jiwa (BPS, 2012), sehingga kebutuhan panganpun semakin meningkat. Berbagai upaya telah dilakukan pemerintah untuk pemenuhan pangan, yaitu melalui program ekstensifikasi, intensifikasi, dan diversifikasi. Salah satu program intensifikasi adalah penggunaan pestisida untuk pengendalian organisme pengganggu tanaman.Akhir-akhir ini ketahanan pangan dihadapkan pada permasalahan lingkungan yang mendapat perhatian serius, antara lain: pencemaran bahan beracun berbahaya di lahan pertanian seperti bahan agrokimia (pestisida). Inovasi teknologi menjadi prioritas dalam upaya mitigasi penyebab permasalahan lingkungan melalui kajian ekologis, dan dengan mempertimbangkan peningkatan tuntutan konsumen terhadap keamanan produk pertanian yang sehat.Perkembangan sektor pertanian telah mengakibatkan peningkatan pencemaran lingkungan oleh bahan kimia buatan manusia. Di antara polutan-polutan tersebut, terdapat polutan organik yang disebut organoklorin. Organoklorin merupakan polutan yang bersifat persisten dan dapat terbioakumulasi di alam serta bersifat toksik terhadap manusia dan makhluk hidup lainnya. Organoklorin tidak reaktif, stabil, memiliki kelarutan yang sangat tinggi di dalam lemak, dan me...
ABSTRAK Lindan dan aldrin merupakan insektisida organoklorin yang residunya masih ditemukan di lahan sayuran. Lindan dan aldrin merupakan senyawa cemaran organic persisten (Persistent Organic Pollutants atau POPs) yang memiliki toksisitas dan persistensi yang tinggi di dalam tanah. Salah satu mitigasi residu insektisida POPs dalam tanah adalah remediasi dengan menggunakan arang aktif dengan memanfaatkan mikroba konsorsia. Percobaan lapang dilaksanakan di lahan sayuran di Magelang selama musim penghujan 2010. Tujuan penelitian adalah mengetahui efektivitas arang aktif diperkaya mikroba konsorsia terhadap degradasi residu lindan dan aldrin di lahan sayuran. Percobaan lapang disusun menggunakan rancangan acak kelompok dengan tiga ulangan dan tujuh perlakuan. Parameter yang diamati yaitu karakteristik tanah, residu insektisida lindan dan aldrin dalam tanah dan air, tinggi dan hasil biomassa sawi. Arang aktif efektif menurunkan residu lindan dan aldrin dalam tanah hingga lebih dari 50 % saat 7 hari setelah aplikasi insektisida pada tanaman sawi. Arang aktif yang diperkaya mikroba konsorsia cennderung menurunkan residu lindan dan aldrin lebih tinggi daripada arang aktif tanpa diperkaya mikroba konsorsia. Kadar pestisida lindan dan aldrin dalam tanaman pada perlakuan arang aktif dari tempurung kelapa lebih tinggi daripada arang aktif tongkol jagung dengan inokulasi mikroba. Pemberian arang aktif cenderung memberikan hasil biomassa tanaman sawi lebih tinggi daripada tanpa arang aktif.
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