Model aliran dan penggunaan software UPFLOW untuk evaluasi irigasi evaporatif untuk tanaman padi  dengan perbedaan tekstur tanah

Ardiansyah; Afik Hardanto; Satyanto Saptomo; Chusnul Arif

doi:10.31028/ji.v17.i2.12-21

The usage water flow model and UPFLOW software for evaporative irrigation evaluation of rice crops with different soil texture

Authors

Ardiansyah Program Studi Teknik Pertanian, Universitas Jenderal Soedirman https://orcid.org/0000-0003-4285-5480
Afik Hardanto Program Studi Teknik Pertanian, Universitas Jenderal Soedirman https://orcid.org/0000-0002-4673-7345
Satyanto Saptomo Departemen Teknik Sipil dan Lingkungan, IPB University
Chusnul Arif Departemen Teknik Sipil dan Lingkungan, IPB University

DOI:

https://doi.org/10.31028/ji.v17.i2.12-21

Keywords:

water flow model, UPFLOW software, Evaporative Irrigation, ET Demand

Abstract

Subsurface irrigation using sheet-pipe requires determining the depth of sheet-pipe installation. The aim of this research is to determine the profile of groundwater rise in an evaporative irrigation system for three types of soil with different textures (at different locations), determine the capillary rise flux at these locations, and design the laying of the water supply pipe (water table) for the evaporative irrigation system effective. The locations chosen were Malang, Samosir and Lampung. Soil texture profiles from each of the three locations; silt loam-clay loam, clay-clay loam-clay, and silt loam-silt-loam-clay loam. Evaporative irrigation by providing water from below the root zone with a drainage pipe called sheet-pipe. The first stage was simulating capillarity water flow using a flow model. Simulation was carried out on existing texture, namely clay, clay loam and silt loam. The next stage was to use UPFLOW to determine the flux and determine the sheet-pipe position. At this stage, the ET demand for each phase of plant development was determined to be 1.2 mm/day (early stage), 2.6 mm/day (vegetative or development), 2.7 mm/day (fertilization), and 1.6 mm/day (seed maturation). Simulation shows that capillarity cannot keep up with ET demand, so the soil surface to a depth of around 5 cm shows low water content. The low water content was less than the critical water content. UPFLOW result shows that sheet pipes must be installed at different depths at the three locations to meet ET demand and sufficient aeration for rooting. The soil texture profile determines this depth.

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References

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The usage water flow model and UPFLOW software for evaporative irrigation evaluation of rice crops with different soil texture

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