E7 Soil

this image shows the soil and the different horizons that is shown in the image from the root of the ground and the soil sunken into the roots and surrounded by sand also how it builds up into a plant.

this image shows the different layers that soils holds and how its held into different horizons, this shows that each layer and how the sun seeps into the soil and grows up a plant.

(i) State a main constituent of SOM.

A main constituent are decayed plant, non living organic

(ii) Explain with reference to the structure above, how SOM can increase the soil quality, in terms of the following

Provision of nutrients:

It contains amine, amino acid (COOH), it can be interchanged by ions of nutrients, ion exchange of nutrients can occur due to H (COOH)

Water retention

It has OH.NH polar, as it can create hydrogen bonds with water molecules in the soil

(b) Discuss how irrigation can cause soil degradation

Irrigation contains sodium (Salt) when evaporation happens the salts stay, as there will be more build up in salt, which has an effect on plants. As they do not grow on soil that as high amount of salt, with irrigation, water can remove nutrients. (Ca^2+, K^+, etc).

(c) State the name of one source for each of the following organic soil pollutants.

Polyaromatic hydrocarbons (PAHs)

Coal

Organotin compounds

Presticides

this link talks about the soil texture of the environment.

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