This test was not done on soil, however it showed students how salt levels can effect soil's productivity. Seven different bags were filled with 5 white beans wrapped in a paper towel. Solutions of regular table salt (NaCl) were created so that each solution had a different concentration. They were: 0g NaCl/100mL H2O, .5g NaCl/100mL H2O, 1g NaCl/100mL H2O, 2g NaCl/100mL H2O, 3g NaCl/100mL H2O, 4g NaCl/100mL H2O, and 5g NaCl/100mL H2O. Each bag was given 20mL of the salt solution of varying concentrations.
The bags were sealed to prevent evaporation. After a week, the bags were examined to assess the beans' growth.
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| 0g NaCl showed the most growth |
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| .5g NaCl showed the second most growth |
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| 2g NaCl had few sprouting beans |
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| 3g NaCl had no growth |
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| 4g NaCl had no growth |
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| Not visible, but 5g had no growth |
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1g NaCl had one sprouting bean
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From this test, it can be concluded that high salinity levels halts soil production. To remediate salty soil, calcium ions must be added to balance the sodium ions. A good source of this is gypsum. It is not recommended to water down over salted soil because the salt particles may be carried into runoff and cause the same problem in fields elsewhere.
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