Question

Which of the following environmental factors influence soil structure?

total precipitation

dominant vegetation

topography

average temperature

latitude

bedrock type

longitude

At 50% of field capacity, the matric potential of clay soils is:

more negative than loam and sand

more negative than sand and less negative than loam

matric potential is equivalent for all soils at the same water content

less negative than sand and more negative than loam less negative than loam and sand

Factors that affect percentage base saturation of soil include (choose any/all that apply):

clay content

parent material
soil microbial respiration

soil water content
Total precipitation

depth of O horizon

soil pH

Answer 1

1.All of these factors will affect the structure of soil.

...Climate is one of the most important factors affecting the formation of soil with important implications for their development, use and management perspective with reference to soil structure, stability, topsoil water holding capacity, nutrient availability and erosion. Climate is influenced by the longitude and latitude.

..The soil remains above thebedrock that weathered to form the soil.

2.Soil matric potential (SMP) is realistic criterion for measuring soil water availability to plants as it constitutes the force with which water is held by soil matrix (soil particles and pore space) and is measured by tensiometer.

3.clay contentSoil texture: The negatively charged clay colloids attracts positively charged cations and holds them. Therefore, the cation exchange capacity of soils increases with increase in per centage of clay content.