describe the factors that contribute to the formation and fertility of soil
Answers
Answer:
Explanation:
Factors Responsible for the Formation of Soil
The relief features, parent material, climate, vegetation and other life-forms as well as time apart from human activities are the major factors responsible for the formation of soil.
1. Parent Material: It is deposited by streams or derived from in-situ weathering. In this stage, soil inherits many properties like the mineral composition, the colour, the particle size and the chemical elements. For example- Black soil derived its colour from lava rock
2. Climate: It is one of the important factors in the formation of soil because it affects the rate of weathering of the parent rock.
3. Role of precipitation: The variability in the precipitation modified the composition of the soil. For Example- Areas with little rainfall with high rate of evaporation led to the accumulation of salts in the soil. The soils underlying tropical rain forests tend to be nutrient-poor because of intensive leaching due to heavy rains.
4. Role of temperature: It is also play important role because fluctuations in temperature causes shrinking and swelling, frost action and general weathering in soils.
5. Biota (Flora, Fauna and Microorganisms): Biota, in conjunction with climate, modifies parent material to produce soil. For Example- Leguminous plants (such as beans, peas, and groundnuts) have nitrogen-fixing bacteria. These plants take the nitrate ions directly from these nitrogen-fixing bacteria. It improves the fertility of soil by fixing atmospheric nitrogen to ammonia or ammonium.
5. Topography (Relief, Altitude and Slope): It is considered as passive factor to modifying the effects of climate because it affects soil processes, soil distribution and the type of vegetation.
6. Time: The formation of the soil is not one day process but requires many years to form. Younger soils have some characteristics from their parent material, but as they age, the addition of organic matter, exposure to moisture and other environmental factors may change its features.
Here are some factors that influence soil fertility; answer from quora
answered by Ezinne Okorie, B. Agric. Tech, M.Sc Soil Science & Soil Chemistry, Federal University of Technology Yola (2015)
soil pH: this determines which nutrient becomes available for plant use.
Presence of organic matter: organic materials have nutrients in them that need to be recycled for the next growing cycle. Increasing soil organic matter content means you are increasing the fertility of the soil.
Moisture content : nutrients available in the soil for plant use are mostly found in the soil solution, not in the solid matrix. Soil with low moisture content are not very fertile.
Antagonistic effect of another nutrient : the presence of certain elements in the soil can make other elements unavailable.
Bulk density: you don't want your soil to be compacted. Because compaction can obstruct root penetration. If the roots cannot penetrate the soil, then they can't reach the nutrients.
Clay content: this factor determines the cation exchange capacity of the soil. Higher CEC means more nutrients would be temporarily reserved for when the plants need them. Low CEC means that nutrients can be easily lost by leaching off to the ground water.
Answer:
The relief features, parent material, climate, vegetation and other life-forms as well as time apart from human activities are the major factors responsible for the formation of soil. 2. Climate: It is one of the important factors in the formation of soil because it affects the rate of weathering of the parent rock.
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