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Journal : Sains Tanah

KERAGAMAN DAN LAYANAN EKOLOGI MAKROFAUNA EPIGEIK PADA PERTANAMAN WORTEL (Daucus carota L.) YANG DIBERI BERBAGAI IMBANGAN PUPUK ORGANIK DAN ANORGANIK Dewi, Widyatmani Sih; Handayani, Putri; Sumani, Sumani
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 5, No 2 (2008)
Publisher : Faculty of Agriculture, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v5i2.74

Abstract

Recently ecological services by macrofauna diversity to sustainable production function of agroecosystem got a lot of attention. Epigeic macrofauna is diverse of macrofaunas which their life and activities are on the land surface, act as decomposer, litter transformer, and`predator, so they are important to keep ecosystem stability. Inorganic fertilizer usage continually on carrot crop without organic fertilizer can reduce soil macrofauna diversity. Improvement can be done by the use of organic and inorganic fertilizer equally. The aim of this research was to measure epigeic macrofauna diversity and their ecological services to carrot production by giving some proportions of organic and anorganic fertilizer. The research conducted in the end of December 2007 in a farmer field in Tawangmangu. It use RAKL (Random Completly Block Design) with single factor treatment. The treatment was fertilizer type usage proportion of organic and inorganic fertilizer. They were composed of 9 proporsition composition as follows: control, 50% inorganic fertilizer, 100% inorganic fertilizer, 50% organic fertilizer, 50% organic fertilizer added by 50% inorganic fertilizer, 50% organic fertilizer added by 100% inorganic fertilizer, 100% organic fertilizer, 100% organic fertilizer added by 50% inorganic fertilizer, 100% organic fertilizer added by 100% inorganic fertilizer. 100% inorganic fertilizer were composed of Urea 150 kg ha-1, SP 36 200 kg ha-1, and KCL 100 kg ha-1. 100% dosage organic fertilizer was 20 tons ha-1. To recognize the treatment effect is done by F test and close relationship among variables tested by corelation analysis. The result showed that organic and inorganic fertilizer proportion didn’t significant to diversity, population dencity and biomass epigeic macrofauna, but affected to β caroten content of carrot. Hymenoptera was dominant macrofauna in carrot crop. Macrofauna function to increase β caroten of carrot is indirect. Key words: fertilizer proportion, epigeic macrofauna, β caroten, Hymenoptera, ecological service
POTENSI ISOLAT MIKROBIA ASAL ANDISOL DIENG, JAWA TENGAH SEBAGAI INOKULUM PUPUK HAYATI PENGOKSIDASI SULFUR Sudadi, Sudadi; Ernawati, Ika; Sumarno, Sumarno; Dewi, Widyatmani Sih; Widijanto, Hery
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 10, No 1 (2013)
Publisher : Faculty of Agriculture, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v10i1.130

Abstract

Masalah kekahatan hara cenderung meningkat, termasuk kekahatan sulfur. Penggunaan pupuk NPK berkemurnian tinggi ikut mendorong terjadinya kekahatan hara di lahan pertanian. Masalah kekahatan hara ini dapat diatasi melalui penggunaan sulfur elementer yang disertai denngan pupuk hayati pengoksidasi sulfur. Penelitian bertujuan untuk mengkaji potensi mikrobia pengoksidasi sulfur yang diisolasi dari tanah Andisol Dieng, Jawa Tengah sebagai inokulan untuk pupuk hayati. Tanah Andisol Dieng secara alamiah mengandung sulfur yang cukup tinggi sehingga diperkirakan dihuni oleh banyak mikrobia pengoksidasi sulfur. Penelitian terdiri dari dua percobaan, masing-masing disusun dalam rancangan percobaan acak lengkap dua faktor, yaitu macam isolat mikrobia hasil isolasi dari Andisol Dieng dan lama inkubasi. Percobaan pertama menggunakan medium cair Czapek-dox + sulfur sedangkan percobaan kedua menggunakan medium vermikompos. Tiap-tiap kombinasi perlakuan diulang tiga kali. Variabel yang diamati meliputi jumlah S terlarut, kerapatan sel bakteri atau biomassa jamur dan pH medium. Dari hasil eksplorasi diperoleh satu isolat bakteri I1 dan tiga isolat jamur F1, F2 dan F3 yang menunjukkan kemampuan mengoksidasi sulfur pada medium Czapek-dox+ sulfur elementer agar. Hasil percobaan menunjukkan bahwa proses oksidasi sulfur meningkat seiring dengan bertambahnya waktu inkubasi yang ditunjukkan oleh meningkatnya jumlah S-terlarut, kerapatan sel bakteri atau biomassa jamur dan menurunnya pH medium. Hasil serupa diperoleh dari percobaan kedua. Isolat jamur F2 menunjukkan potensi yang paling tinggi sebagai inokulan pengoksidasi sulfur yang ditunjukkan oleh kemampuannya tumbuh dan mengoksidasi sulfur yang paling tinggi baik pada medium cair Czapek-dox + sulfur maupun pada medium vermikompos.
PENGARUH CACING TANAH DAN BAHAN ORGANIK TERHADAP DINAMIKA POPULASI MIKROBIA BEBERAPA JENIS TANAH Dewi, Widyatmani Sih
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 1, No 2 (2002)
Publisher : Fakultas Pertanian Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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KUALITAS VERMIKOMPOS DIDASARKAN PADA CAMPURAN MEDIA, JENIS CACING TANAN, DAN PAKAN TAMBAHAN Dewi, Widyatmani Sih; Supriyadi, Supriyadi
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 3, No 2 (2003)
Publisher : Faculty of Agriculture, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v3i2.113

Abstract

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PENYUSUNAN MODEL PENGELOLAAN KUALITAS TANAH SAWAH DI KECAMATAN JATIPURO KABUPATEN KARANGANYAR Nugroho, Wahyu Adi; Utomo, Sudjono; Dewi, Widyatmani Sih
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 8, No 1 (2011)
Publisher : Faculty of Agriculture, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v8i1.33

Abstract

The intensive paddy soil management were known caused the soil degradation, thus the proper paddy soil quality management was needed to maintain the sustainability of soil function. The aim of the research was built a model that can be used as the reference of paddy soil quality management in district of Jatipuro, Karanganyar regency. The research was executed on October 2008 until February 2009. The research was descriptive explorative, carried out by collecting secondary data for model building and getting sample based on random sampling method at paddy soil in each Soil Map Unit (SMU), laboratory analysis for each selected soil quality indicator, and field observation for model validation. The results showed that the builded model: SQi = 0,414 + 0,363 pH, can be used as the reference of paddy soil quality management in district of Jatipuro. Based on the model then the recommendation of paddy soil quality management could be determined, through increasing pH by submerged the soil and delay the rice planting about 2 weeks after flooding. Keywords: model, paddy soil quality, district of Jatipuro