Effect of Salinity on Moisture Flow and Root Water Uptake in Sandy Loam Soil

Kumar, S and Sonkar, I and Gupta, V and Hari Prasad, Suryafce and Ojha, CSP (2021) Effect of Salinity on Moisture Flow and Root Water Uptake in Sandy Loam Soil. In: Journal of Hazardous, Toxic, and Radioactive Waste, 25 (3).

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Abstract

The present study analyzes the effect of salinity on crop growth and root zone soil moisture dynamics. A newly developed root water uptake (RWU) model was used for simulation of soil moisture and RWU for irrigation field experiments where paddy was grown with irrigation water with varying salinity concentrations (0.5, 7.9, 14.7, and 21.2 dS/m). The growth of the crop was monitored regularly, and crop parameters such as leaf area index (LAI) and root depth along with the soil moisture profile were measured during the crop growth period. The nonlinear parameter for the RWU model was estimated using an empirical relation in terms of observed crop variables (LAI and root depth) for each saline irrigation condition. Root zone soil moisture and RWU for the prevailing hydrometeorological conditions during the crop period and soil-crop parameters were simulated for the analysis. The irrigation experiments show that the growth of the crop is significantly affected by the salt concentration in soil-water, resulting in a decrease in the crop canopy (LAI) and root depth decreases with an increase in the salt concentration. The model simulation results show that an increase in salt concentration in irrigation water results in reduced root water extraction and reduced moisture content in the soil profile. © 2021 American Society of Civil Engineers.

Item Type:	Journal Article
Publication:	Journal of Hazardous, Toxic, and Radioactive Waste
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright for this article belongs to American Society of Civil Engineers (ASCE)
Keywords:	Crops; Irrigation, Empirical relations; Hydrometeorological conditions; Irrigation waters; Non-linear parameters; Root zone soil moistures; Saline irrigation; Salt concentration; Soil moisture profiles, Soil moisture
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	03 Aug 2021 06:33
Last Modified:	03 Aug 2021 06:33
URI:	http://eprints.iisc.ac.in/id/eprint/68913

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