Unavailability of Water in Saline Soils


-[narrator] There are many different salts in soil
that provide nutrients to plants. However, if there is too much salt in the soil,
this interferes with water uptake. Salty or saline soils can result from various
sources of salt ions. Here we’ll look at sodium chloride as an example of a salt
that interferes with plant roots trying to take up water from soil. This is the
same salt we put on our food. Each molecule of salt is made up of a sodium
ion positively charged, and a chlorine ion negatively charged. Scientists write this as NaCl. Water is made up of the elements hydrogen-H, and
oxygen-O. Two atoms of hydrogen and one atom of oxygen, H2O. Water is a polar molecule positive on one side and negative on the other. Salt is the same way. Due to the polar properties of salt and water, they bind together one molecule of salt binding many molecules of water. Let’s see what happens when
water gets close to a salt molecule. When salt comes into contact with water, as in soil, salts negatively charged ions, such as chloride, attract waters positively
charged hydrogen. Meanwhile, salts positively charged side attracts waters
negatively charged oxygen. So, how do saline soils affect plants. Water is
needed by all living things. Plant roots need to take up water from the soil. When there is a lot of salt and soil, much of the water will be bound by salt. Plant
roots, therefore, aren’t able to use the water. Without plentiful access to water,
plant growth and health are compromised. (light jazz music)

7 thoughts on “Unavailability of Water in Saline Soils

  1. maybe someone can tell me if I'm wrong. But I thought at 45 seconds it should be chloride ion and not chlorine ion. Chlorine is an atom not an ion and has no negative charge, it becomes an ion when it gains or shares an electron becoming stable with 8 outer shell electrons and takes on a charge. Cl-

  2. I think this short video has a good initial intention, but there are some mistakes, because of its vulgarization goal. (excuse my english .. I'm french)

    A salted soil, also called a salsodic one, can be distinguished in two big categories : the saline and alckaline soils. The first ones contain a lot of salts, but are poor in sodium – there are mostly magnesium and calcium salts. The second ones, the alckaline soils, contain a lot of sodium : more than 15% of its exchangeable ions.
    These two kinds of soils show a very different physic comportment, and so a different impact on their biology.

    I hope this comment does not contain mistakes, and that it can help someone to understand the complex domain of geochemistry.

  3. Can any body tell me what to do in this situation?
    Some one told me by mixing sulfer at bigning with first fertilizer shows good result to plant growth.

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