Explain “Soil is the medium for plant growth”
Answers
Answer:
Soils support roots and keep them upright for growth. Soils provide plants with essential minerals and nutrients. Soils provide air for gaseous exchange between roots and atmosphere. Soils protect plants from erosion and any other destructive physical, biological and chemical activity.
Explanation:
Explanation:
We tend to take the soil around us for granted. It is much more than mud, clay or dirt. All the food that we consume depends ultimately upon soil. Plants grow and depend on the soil. We either eat plants that grow directly in the soil or the animals that eat the plants.
Soils are the part of the lithosphere where life processes and soil forming processes both take place.
In this unit we will look at the soil system, soil water, soil formation and the consequences of soil degradation.
This unit is a minimum of 3 hours
Significant Ideas
The soil system is a dynamic ecosystem that has inputs, outputs, storages and flows.
The quality of soil influences the primary productivity of an area..
Big questions:
What strengths and weaknesses of the systems approach and the use of models have been revealed through this topic?
To what extent have the solutions emerging from this topic been directed at preventing environmental impacts, limiting the extend of the environmental impacts, or restoring systems in which environmental impacts have already occurred:
What value systems can you identify at play in the cases and approaches to resolving the issues addressed in this topic?
In what ways might the solutions explored in this topic alter your predictions for the state of human societies and the biosphere some decades from now?
How does the systems approach help our understanding of soils and soil processes?
With respect to soils, how might the environmental value systems of a large scale commercial farmer differ from that of a traditional subsistence farmer?
How might the pressure on soils change over the next 20 years? Give reasons to support your answer.