AllenDasian

A picture of the Murray River. It's saltier than the
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E -Task is so cool! you miss out on boring school work!but I dan't wanna miss out on too much!
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** What is salinity? ** Salinity is the word used to describe the salt content of soil or water. When this salt content is excessive it degrades water quality and land productivity. Soluble salts are often found in water and soil but usually not in sufficient concentrations to affect plant and animal survival. Salinity increases are usually caused by a rise in the level of underground water-tables bringing naturally occurring salt to the surface. This concentrates salt and affects the environment dependent on that soil and water. There are two distinct types of salinity:  ·   dryland salinity  ·   irrigation salinity
 * Dryland salinity ** is caused when the rising water-table brings natural salts in the soil to the surface. The salt remains in the soil and becomes progressively concentrated as the water evaporates or is used by plants. One of the main causes for rising water-tables is the removal of deep rooted plants, perennial trees, shrubs and grasses and their replacement by annual crops and pastures that do not use as much water.

** Irrigation salinity ** occurs when irrigation water soaks through the soil area where the plant roots grow, adding to the existing water. The additional irrigation water causes the underground water-table to rise, bringing salt to the surface. When the irrigated area dries and the underground water-table recedes, salt is left on the surface soil. Each time the area is irrigated this salinity process is repeated.

How Salinity affects plant growth

We conducted an experiment to find out how salt affects plant growth.

We planted radish seeds in 2 cotton balled cups.1 cup had salt in it and the other had no salt. They were both watered daily except on the weekends. We placed the cups in a sunny place in our classrooms. We left them there for about 5 days, and then we observed them. I thought the cup with salt would Grow a little bit and be yellow. But I was wrong! They didn’t grow at all. The plant in the cup with no salt grew perfectly fine.

The radish seeds in the cup with salt didn’t absorb the salty even if it did the salt would absorb the water in the plant cells. The salt could have eventually killed the plant because radish seeds can’t tolerate salt. (Take in)