Agricultural Assignment. Essay

1620 Words Jan 17th, 2014 7 Pages
Done by: D. Singh


Factors that Affect Soil Nutrients
Nutrient availability can be influenced by several factors and these include:
1. Soil Ph: The relative concentration of the hydrogen irons and or hydroxyl irons may either increase or decrease nutrient availability.
2. The Presence of Other Nutrients: The essence of the various mineral salts will either increase or decrease the other mineral salts in the soil.
3. Leaching: This encourages the draining of mineral salts from the topsoil to subsoil thereby depriving plants of such nutrients.
4. Crop Removal: This may be in form of clean clearing, deforestation or cutting down of harvested crops which lead to loss of nutrients in the soil.
5. Oxidation and Reduction: This is
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The two most common ones are the water and wind erosions. Soil erosion by water is the result of rain detaching and transporting vulnerable soil, either directly by means of rain splash or indirectly by rill and gully erosion. Rain splash erosion occurs when rain moves soil directly. Splash is more effective with high intensity rain to detach and move soil for a distance. However, rain splash erosion is not as serious as the others are because although a quite decent amount of soil is moved, it will later be redistributed back over the surface of the soil again. Stormy and rainy tropical areas near the equator are the places suffer more from rain splash because of their high intensity rainfall, which is needed for rain splash.
Rainfall may also move soil indirectly, by means of runoff in rills-small channels or gullies-larger channels, which are too big to be removed by tillage. In many parts of the world, rill and gully erosion is the dominant form of water erosion. A portion of the rainfall, which is not absorbed into the soil, runs down the hill and creates runoff or overland flow as it is under gravity force. Besides that water erosion, wind erosion is also a concerned problem for the soil. It usually occurs when the dry, dusty and sandy soil, which is not adequately taken care and protected by the plants, is blown away by the strong wind. Besides that, human activities cause 10 times more soil erosion than all natural

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