Crop tolerance to seawater

[1] The government of the Netherlands reports a breakthrough in food security as specific varieties of potatoes, carrots, red onions, white cabbage and broccoli appear to thrive if they are irrigated with salt water.

x) For potato only one comparable value is known in literature, namely for the very sensitive variety white rose having a threshold of 1.7 dS/m [8] +) For barley, in contrast, the U.S. Salinity Laboratory mentions a threshold value of ECe = 8 dS/m, which makes it a tolerant crop [9] The highest tolerance is found for the onion variety "Red" which classifies as slightly sensitive.

In the Texel report, also the Van Genuchten-Gupta model (giving an S-curve) was used to find the soil salinity at the 90% yield point.

The Mediterranean Agronomic Institute, Valenzano, Bari, Italy South coast grew 5 cultivars of lentil irrigated with sea water of different salinity levels.

[10] Some of the results are shown in the following table: Halophytes, or salt-loving plants, can be irrigated with pure seawater with the aim to grow fodder crops.

Liu Shiping's team at Yangzhou University created rice varieties that can be grown in salt water, and achieve yields of 6.5 to 9.3 tons per hectare.

They concluded that certain amounts of seawater can be practically used in hydroponics, allowing freshwater savings and increasing concentrations of certain mineral nutrients.

Maas–Hoffman model fitted to a data set.
In this example the crop has a salt tolerance (threshold) of ECe=7 dS/m beyond which the yield declines.
Data from Salt Farm Brochure. Boundaries (yellow) and error ranges (light brown) have been added. The scatter is quite high. It is not known whether the yield percentages were computed year by year (A), or for all years combined (B). In case B the error ranges are still larger due to annual yield differences. No analysis of variance (Anova) was done to prove that the Maas-Hoffman model really is a statistically significant improvement over a simple, straightforward, downward sloping linear regression model.
The Salt Farm Texel also published a graph of the yield-salinity relation of white cabbage. Boundary lines were added separately in red color. The boundaries suggest that the slope of the ellipse encompassing the confidence area of the breakpoint should be upward to the right instead of to the left. However the Texel document does not give an explanation of the construction of the ellipse.
Lentils
Turtleweed
Barley ( Hordeum vulgare )