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Modeling of Fertilizer Transport for Various Fertigation Scenarios under Drip Irrigation

1
Civil Engineering Department, Faculty of Engineering, Port Said University, Port Fouad 42523, Egypt
2
Division of Water Resources Engineering, Lund University, Box 118, SE-221 00 Lund, Sweden
3
Center for Middle Eastern Studies, Lund University, Box 201, SE-221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 893; https://doi.org/10.3390/w11050893
Received: 1 April 2019 / Revised: 18 April 2019 / Accepted: 20 April 2019 / Published: 28 April 2019
(This article belongs to the Special Issue Study of the Soil Water Movement in Irrigated Agriculture)
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Abstract

Frequent application of nitrogen fertilizers through irrigation is likely to increase the concentration of nitrate in groundwater. In this study, the HYDRUS-2D/3D model was used to simulate fertilizer movement through the soil under surface (DI) and subsurface drip irrigation (SDI) with 10 and 20 cm emitter depths for tomato growing in three different typical and representative Egyptian soil types, namely sand, loamy sand, and sandy loam. Ammonium, nitrate, phosphorus, and potassium fertilizers were considered during simulation. Laboratory experiments were conducted to estimate the soils’ adsorption behavior. The impact of soil hydraulic properties and fertigation strategies on fertilizer distribution and use efficiency were investigated. Results showed that for DI, the percentage of nitrogen accumulated below the zone of maximum root density was 33%, 28%, and 24% for sand, loamy sand, and sandy loam soil, respectively. For SDI with 10 and 20 cm emitter depths, it was 34%, 29%, and 26%, and 44%, 37%, and 35%, respectively. Results showed that shallow emitter depth produced maximum nitrogen use efficiency varying from 27 to 37%, regardless of fertigation strategy. Therefore, subsurface drip irrigation with a shallow emitter depth is recommended for medium-textured soils. Moreover, the study showed that to reduce potential fertilizer leaching, fertilizers should be added at the beginning of irrigation events for SDI and at the end of irrigation events for DI. As nitrate uptake rate and leaching are affected by soil’s adsorption, it is important to determine the adsorption coefficient for nitrate before planting, as it will help to precisely assign application rates. This will lead to improve nutrient uptake and minimize potential leaching. View Full-Text
Keywords: drip irrigation; fertilizer transport; fertigation strategy; adsorption coefficient; HYDRUS-2D/3D drip irrigation; fertilizer transport; fertigation strategy; adsorption coefficient; HYDRUS-2D/3D
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Elasbah, R.; Selim, T.; Mirdan, A.; Berndtsson, R. Modeling of Fertilizer Transport for Various Fertigation Scenarios under Drip Irrigation. Water 2019, 11, 893.

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