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. 2018 Feb 8;8(1):2679.
doi: 10.1038/s41598-018-20968-z.

Soil salinity and matric potential interaction on water use, water use efficiency and yield response factor of bean and wheat

Mahnaz Khataar  1 , Mohammad Hossien Mohammadi  2 , Farzin Shabani  3
Affiliations

Soil salinity and matric potential interaction on water use, water use efficiency and yield response factor of bean and wheat

Mahnaz Khataar et al. Sci Rep. .

Erratum in

Abstract

We studied the effects of soil matric potential and salinity on the water use (WU), water use efficiency (WUE) and yield response factor (Ky), for wheat (Triticum aestivum cv. Mahdavi) and bean (Phaseoulus vulgaris cv. COS16) in sandy loam and clay loam soils under greenhouse conditions. Results showed that aeration porosity is the predominant factor controlling WU, WUE, Ky and shoot biomass (Bs) at high soil water potentials. As matric potential was decreased, soil aeration improved, with Bs, WU and Ky reaching maximum value at -6 to -10 kPa, under all salinities. Wheat WUE remained almost unchanged by reduction of matric potential under low salinities (EC ≤ 8 dSm-1), but increased under higher salinities (EC ≥ 8 dSm-1), as did bean WUE at all salinities, as matric potential decreased to -33 kPa. Wheat WUE exceeds that of bean in both sandy loam and clay loam soils. WUE of both plants increased with higher shoot/root ratio and a high correlation coefficient exists between them. Results showed that salinity decreases all parameters, particularly at high potentials (h = -2 kPa), and amplifies the effects of waterlogging. Further, we observed a strong relationship between transpiration (T) and root respiration (Rr) for all experiments.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Shoot biomass of wheat and bean as a function of soil salinity under different soil salinities (EC) in study soils. Error bars show one standard deviation around the mean.
Figure 2
Figure 2
Volume of water use of wheat and bean as a function of matric potential under different soil salinities (EC), in sandy loam and clay loam soils. Error bars show one standard deviation around the mean.
Figure 3
Figure 3
Water use efficiency of wheat and bean as a function of soil matric potential (kPa) under different salinities (EC), in sandy loam and clay loam soils. Error bars show one standard deviation around the mean.
Figure 4
Figure 4
Water use efficiency of wheat and bean as a function of shoot/root ratio, in sandy loam and clay loam soils.
Figure 5
Figure 5
Yield response factor of wheat and bean as a function of soil salinity (EC). Error bars show one standard deviation around the mean.
Figure 6
Figure 6
Yield response factor of wheat and bean as a function of soil matric potential (kPa). Error bars show one standard deviation around the mean.
Figure 7
Figure 7
Wheat transpiration rate (m3/pot) as a function of root respiration rate (μ mol m−3 s−1) and soil matric potential (kPa), under EC = 2 dSm−1 and 20 dSm−1, in sandy loam and clay loam soils.
Figure 8
Figure 8
Bean transpiration rate (m3/pot) as a function of root respiration rate (μ mol m−3 s−1) and soil matric potential (kPa), under EC = 0.7 dSm−1 and 8 dSm−1, in sandy loam and clay loam soils.
See this image and copyright information in PMC

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