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Muhjidin Mawardi
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Agriculture, Biological Sciences & Forestry

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Perubahan Sifat Themal Tanah Pasiran Akibat Penambahan Limbah Organik Muhjidin Mawardi
agriTECH Vol 24, No 1 (2004)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2701.589 KB) | DOI: 10.22146/agritech.13499

Abstract

Mass and heat transfer in a soil is much governed by its thermal properties. A laboratory experimentation has been done to investigate changes of thermal properties of sandy soil as influenced by organic waste mixed in the soil and the effect of the changes on soil moisture retention and evaporation. The samples of sandy soil is mixed with selected organic waste (i. e: sludge of leather industry, sludge of tapioca industry and composted green manure). The treated soil are then placed in PVC tubes, saturated with water and placed in greenhouse for measuring changes in soil properties during 50 days. Result of the experimentation shows that the organic waste mixed with sandy soil could significantly change its volumetric heat capacity and thermal regimes. The changes significantly affect the rate and amount of soil moisture loss through evaporation. During 50 days, the treated soil has lost 35 % of their soil moisture content. While the untreated (control) soil has lost 75 % of its soil moisture content.
Alternatif Perbaikan Cara Giliran Air dengan Memperhitungkan Waktu Tempuh Aliran Air di Saluran Muhjidin Mawardi
agriTECH Vol 11, No 1 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3076.153 KB) | DOI: 10.22146/agritech.19217

Abstract

Penelitian untuk mengetahui faktor kehilangan waktu (time loss) dalam pembagian air irigasi dengan cara giliran telah dilakukan di Daerah Irigasi (DI) Cikeusik, Cirebon Jawa Barat. Penelitian dilakukan selama musim kemarau 1988 dan 1989, dengan cara melakukan pengukuran dan pengamatan lapangan terhadap waktu tempuh aliran air di saluran pada berbagai debit air. Debit air di saluran diukur pada berbagai titik pengamatan dari hulu sampai ke hilir dengan interval waktu dan jarak tartentu untuk mengetahui sebaran debit terhadap waktu dan jarak, Hasil penelitian menunjukkan bahwa faktor kehilangan waktu dalam pembagian air cara giliran belum dipertimbangkan. Padahal laktor kehilangan waktu ini ikut menentukan tercapainya keadilan dalam pembagian air ingasi cara giliran (retasi). Selanjutnya dengan angka kehilangan waktu yang telah dikelahui ini digunakan untuk perbaikan rencana giliran pembagian air di DI yang bersangkutan serta dilakukan analisis untuk melihat keunggulan cara yang baru dibandingkan dengan cara yang lama dalam hal keadilannya.
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