Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC)

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ASADI ZAHRA; MOHAMMADI MOHAMMAD HOSEIN; SHORAFA MEHDI; FARAHBAKHSH MOHSEN

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Journal: Iranian Journal of Soil and Water Research Year:2020 | Volume:51 | Issue:7 Page(s): 1769-1782

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Title

Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC)

Author(s)

ASADI ZAHRA | MOHAMMADI MOHAMMAD HOSEIN | SHORAFA MEHDI | FARAHBAKHSH MOHSEN | Issue Writer Certificate

Keywords

Water UptakeQ2

Salinity StressQ2

Available WaterQ3

CornQ2

Abstract

The purpose of this study is to present a weighting factor for considering limitation of salinity on plant Water Uptake (ω si) for the concept of Integral Water Capacity (IWC). The experiment was conducted under greenhouse conditions and included Corn planting in two soil types, three salinity levels (1. 5, 4, and 8 dS m-1), and three replications. After the plants were fully established, all pots were continuously irrigated with a specific salinity. The transpiration values were obtained from the weight differences of pots considering water mass balance components at different times. Cumulative transpiration was calculated at each time step and they were plotted against the drainage water salinity at the same time. Then, using the numerical derivative of the cumulative transpiration curves, the transpiration intensity curve was calculated. By fitting a logarithmic model and their relativization, the effect of salinity constraint on the transpiration was calculated and a new salinity weighting coefficient was proposed. The results of ω si showed that the relative Water Uptake decreased logarithmically with increasing salinity and the salinity tolerance of Corn varied in soils with different properties and a constant value cannot be reported as salinity tolerance.

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APA: Copy

ASADI, ZAHRA, MOHAMMADI, MOHAMMAD HOSEIN, SHORAFA, MEHDI, & FARAHBAKHSH, MOHSEN. (2020). Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC). IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 51(7 ), 1769-1782. SID. https://sid.ir/paper/369266/en

Vancouver: Copy

ASADI ZAHRA, MOHAMMADI MOHAMMAD HOSEIN, SHORAFA MEHDI, FARAHBAKHSH MOHSEN. Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC). IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2020;51(7 ):1769-1782. Available from: https://sid.ir/paper/369266/en

IEEE: Copy

ZAHRA ASADI, MOHAMMAD HOSEIN MOHAMMADI, MEHDI SHORAFA, and MOHSEN FARAHBAKHSH, “Explanation of the Weighting Factor for Salinity Constraint in the Integral Water Capacity Concept (IWC),” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 51, no. 7 , pp. 1769–1782, 2020, [Online]. Available: https://sid.ir/paper/369266/en

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