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PRIHASTO SETYANTO
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METHANE EMISSION FROM PADDY FIELDS AS INFLUENCED BY DIFFERENT WATER REGIMES IN CENTRAL JAVA Setyanto, Prihasto; Bakar, Rosenani Abu
Indonesian Journal of Agricultural Science Vol 6, No 1 (2005): April 2005
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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The concentration of methane (CH4) in the atmosphere is increasing at 1% per annum and rice fields are one of the sources that contribute to about 10-15% of the atmospheric CH4. One of the options to reduce greenhouse gas emission from rice fields is probably through water management. A field study was conducted to investigate the effects of water management practices on CH4 emission from rice field plots on a silty sand Aeric Tropaquept soil at Research Station for AgriculturalEnvironment Preservation, Jakenan, Central Java, Indonesia, during the dry season of March to June 2002. Four water regimes tested were: (1) 5 cm continuous flooding (CF), (2) 0-1 cm continuous flooding (ST), (3) intermittent irrigation (IR) where plots received continuously 5 cm of flooding with two times of draining at 15-20 and 25-30 days after transplanting (DAT), and (4) pulse irrigation (PI) where plots were watered until 5 cm level and left to dry by itself until the water table reached30 cm beneath soil surface then watered again. The total CH4 emissions of the four water treatments were 254, 185, 136 and 96 kg CH4 ha-1 for CF, ST, IR and PI, respectively. Methane emission increased during the early growing season, which coincided with the low redox potential of -100 to -150 mV in all treatments. Dry matter weight of straw and filled grainamong the water treatments did not show significant differences. Likewise, total grain yield at 14% moisture content was not significantly different among treatments. However, this result should be carefully interpreted because the rice plants in all water treatments were infested by stem borer, which reduced the total grain yield of IR64 between 11% and 16%. This study suggests that intermittent and pulse irrigation practices will beimportant not only for water use efficiency, but also for CH4 emission reduction.
Pemanfaatan Pupuk Organik untuk Meningkatkan Populasi Bakteri dan Produksi Tanaman Padi Gogorancah Wahyuni, Sri; Rianto, Slamet; Muanisah, Ukhwatul; Setyanto, Prihasto
Proceeding Biology Education Conference: Biology, Science, Enviromental, and Learning Vol 13, No 1 (2016): Prosiding Seminar Nasional XII Biologi
Publisher : Universitas Sebelas Maret

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Kecenderungan petani menggunakan bahan agrokimia untuk  budidaya tanaman, terutama pupuk anorganik dan pestisida dalam jangka panjang dapat menimbulkan penurunan kualitas tanah. Penggunaan pupuk organik sangat diperlukan untuk memperbaiki kualitas tanah, terutama yang terkait dengan jumlah bakteri yang bermanfaat bagi pertumbuhan tanaman dan peningkatan produksi tanaman. Penelitian ini dilaksanakan di Kebun Percobaan Jakenan dari bulan Nopember 2015 - Maret 2016, menggunakan rancangan acak kelompok lengkap (RAKL) dengan 6 perlakuan 3 ulangan. Tanaman yang digunakan adalah padi varietas Ciherang. Jarak tanam yang digunakan jajar legowo 2:1 dengan jarak dalam baris (20 x 20) cm. Ukuran plot yang digunakan adalah (10 x 5) m. Populasi bakteri dihitung menggunakan test kid bacterial SANICHECK. Dosis pupuk organik yang gunakan 10 ton dan 20 ton ha-1. Tujuan penelitian adalah untuk mengetahui peningkatan populasi bakteri dan produksi tanaman padi. Hasil penelitian menunjukkan bahwa penggunaan pupuk organik meningkatkan populasi bakteri tanah dari 102 menjadi 107. Produksi padi tertinggi terdapat pada perlakuan penggunaan pupuk organik 20 ton ha-1 yang ditambah dengan pupuk NPK gabah kering panen sebesar 7,3 ton/ha diikuti penggunaan pupuk organik 10 ton/ha + NPK produksi mencapai 7,0 ton/ha. Kata Kunci        : pupuk organik, populasi bakteri, produksi padi
Bioremediasi untuk Menurunkan Kadar Insektisida Klordan di Lahan Sawah Indratin, Indratin; Wahyuni, Sri; Setyanto, Prihasto
Proceeding Biology Education Conference: Biology, Science, Enviromental, and Learning Vol 13, No 1 (2016): Prosiding Seminar Nasional XII Biologi
Publisher : Universitas Sebelas Maret

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Bioremediation   is   one   of the effective   ways   to   remediate   pesticide-contaminated   land,   in order to   reduce environmental pollution problems. Bacillus substillis, Heliothrix oregonensis, Catenococcus thiocycli,and Achoromobacter sp are soil microbes which are capable of lowering the levels of chlordanein the fields. These microbes derived from preliminary research results indigenous soil insulation in the Laboratory of Microbiology LIPI Cibinong. This research is aimed to determine the decrease levels of chlordane in paddy fields cultivated with rice Ciherang variety using bioremediation treatment. The soil used for the planting medium is taken from Cilamaya village, District CilamayaWetan,   Karawang.  This research   is conducted   at   Jakenan Research Station from January to December 2013. This research uses  activated carbon coated urea and biochar enriched by   indigenous  microbes with  a dose 250 kg/ha. This research is designed by using  complete   randomized   block  design  which   is   repeated   three times with for 40 ml microbial concorcia populations 109 in 1 kg of urea coated by biochar or activated carbon. The microplot size 1 x 1 m with spacing of 20 x 20 cm. Insecticide residue analyzes carried out in Balingtan Laboratory in Bogor by gas chromatography, using the SNI 06-6991.1-2004method. The result shows  biochar coconutshell-coated  urea   enriched   with  microbes   in  rice   farming   can  reduce   pesticide  residues   chlordane amountedto 27.10%
Co-Authors A. Wihardjaka Adriani, Terry Ayu Ali Pramono Eni Yulianingsing, Eni HL Susilawati, HL Indratin Indratin Muanisah, Ukhwatul Rosenani Abu Bakar Slamet Rianto Sri Wahyuni