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All Journal JTSL (Jurnal Tanah dan Sumberdaya Lahan) AGRIVITA, Journal of Agricultural Science
Widianto Widianto
Soil Science Department, Faculty Of Agriculture, Universitas Brawijaya, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Environmental Science

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Turning Volcanic Ash into Fertile Soil: Farmers’ Options in Coffee Agroforestry After the 2014 Mount Kelud Eruption Rizki Maulana Ishaq; Danny Dwi Saputra; Rika Ratna Sari; Didik Suprayogo; Widianto Widianto; Cahyo Prayogo; Kurniatun Hairiah
AGRIVITA, Journal of Agricultural Science Vol 42, No 1 (2020)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v42i1.2494

Abstract

Post eruption land reclamation consists of hoeing, mixing volcanic ash with soil, adding external organic and/or in-organic fertilizers and making infiltration-pits (‘rorak’). This study, after the 2014 eruption of Kelud volcano, aimed to evaluate: (a) soil physico-chemical fertility post eruption, (b) impact of organic inputs interacting with ash in infiltration pits on soil C and N underneath (1st experiment), (c) biomass loss (decomposition) of local biomass (Trema orientalis and Parasponia andersonii) in a coffee agroforestry system (2nd experiment). Measurements in the ash-affected (+Ash) Tulungrejo-village (Ngantang-Malang district) were contrasted with an area without recent ash deposits (-Ash) in Krisik (Gandusari-Wlingi district). The 1st experiment (-Ash site) treatments did not lead to statistically significant influences on soil conditions just below the infiltration pits during 12 weeks of monitoring. The 2nd experiment quantified rate of biomass loss from litterbags. In +Ash location, litter half-life time (t50) was 19.5 weeks for coffee or Parasponia as single biomass source to 24 weeks for Coffee+Sengon+Durian. In -Ash location decomposition was slower, with t50 of 24 weeks for Parasponia to 27 weeks for Coffee+Sengon+Durian biomass. Concentrations of soil NH4 and NO3 below the litterbags peaked between 4 to 8 weeks, with nitrification lagging behind on ammonium release.
PENGARUH KEMIRINGAN BATAS HORISON TERHADAP WAKTU PELONGSORAN PADA TANAH DOMINAN DEBU DAN LIAT Sandy Budi Wibowo; W Widianto; S Sudarto
Jurnal Tanah dan Sumberdaya Lahan Vol. 1 No. 1 (2014)
Publisher : Departemen Tanah, Fakultas Pertanian, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (265.074 KB)

Abstract

Landsliding duration is the time span between saturated soil condition and landslide in seconds. It is a parameter to describe failure process. Horizon boundary declivity is a broad in horizon boundary formed an angle toward the horizontal and assumed parallel with slope surface.Landsliding duration can be measured by way of landslide simulation to saturated soil sample through artificial rain with 50 mm hour-1 intensity up to landslide. Soil sample taken as a whole by pipe. This treatment consisted of 40o and 70o horizon boundary declivity and repeated 10 times. Soil sampling conducted at 4 locations divided by 2 locations with silt domination and 2 locations with clay domination. Beside that, qualitative observation performed of process and mass movement as well.The result of observation has shown that landsliding duration at 40o horizon boundary declivity is slower than 70o. Gravitation forces has characteristic of holding soil mass at 40o horizon boundary declivity, but at 70o horizon boundary declivity it will cause landslide. Medium texture will landslide faster than fine texture at 40o horizon boundary declivity. But at 70o horizon boundary declivity both of medium and fine texture will landslide together. Due to that 70o horizon boundary declivity dominated by gravitation force that pull soil mass to the downslope. While at 40o horizon boundary declivity, soil physics nature is still have a role, where fine texture have characteristic of sticky and medium texture have a quality of slick.Translational slides happen at 70o horizon boundary declivity so many times. While topples usually happen at 40o horizon boundary declivity. This cause of at 40o horizon boundary declivity soil physics nature still have a role of landslide, while at 70o horizon boundary declivity gravitation forces pull soil mass more dominant. But if it related with texture, translational slides usually happen at medium texture and topples happen at fine texture so many times. Landslide process at fine texture is preceded by cracks forming ended by topples. While landslide process at medium texture is preceded by smooth erosion on soil surface and soil liquefaction at upper side of horizon boundary because of the water is not able to penetrate beneath horizon.Key words: lansliding duration, horizon boundary declivity, texture
ESTIMASI DISTRIBUSI SPASIAL KEKERINGAN LAHAN DI KABUPATEN TUBAN MENGGUNAKAN PENGINDERAAN JAUH DAN SISTEM INFORMASI GEOGRAFIS Himawan Adiwicaksono; S Sudarto; W Widianto
Jurnal Tanah dan Sumberdaya Lahan Vol. 1 No. 2 (2014)
Publisher : Departemen Tanah, Fakultas Pertanian, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (578.802 KB)

Abstract

Increase population of people who followed by increasing need for people every year, can indirectly lead to landuse changes and global climate changes. Landuse changes and global climate changes can lead to dryness of the land. Droughts can be analyzed with remote sensing and GIS (Geographic Information Systems). This research is to predict spatial distribution of land droughts and its area using remote sensing and GIS technology based on soil moisture. The research was conducted in Tuban, East Java in January 2013 - April 2013. Method used in this research is a statistical approach using nonlinear regression analysis between index (NDSI, NDVI, NDWI) with a water content of soil moisture estimation models to get the land area of Tuban which is then used as a basis for spatial interpolation. Estimation the distribution of land drought is analyzed based on validation data from soil moisture imagery with pF 2.5 and pF 4.2. Extrapolation of the data is carried out by Land Unit Map pF, then classified into three classes, namely class dry (wilting point condition), humid class (available water content), and wet grade (water saturated). Results show the Permanent wilting point condition is most commonly found in almost all districts with an area of Tuban 109,111.05 ha or 55% of the total area of Tuban. Water conditions are available are found in the west as in the district of Tuban regency Kenduran and Jatirogo and has an area of 20861.82 ha or 11% of the total area of Tuban. While the water saturated conditions are found in the District Plumpang, Widang, and Cross and has extensive 8951.22 ha or 4% of the overall total of Tuban.Keyword: water content, remote sensing, GIS
Co-Authors Cahyo Prayogo, Cahyo Danny Dwi Saputra Didik Suprayogo Himawan Adiwicaksono Kurniatun Hairiah Rika Ratna Sari Rizki Maulana Ishaq S Sudarto S Sudarto Sandy Budi Wibowo