soils and soil nutrients management

why does organic matter matter?

• can help with aggregate stability

• helps retain water

• increases nutrient exchange

• none of the above

• all the above

A 2-dimensional vertical section of soil is called a _________

• rachet

• pedon

• order

• series

________ is chemically the most reactive particle and provides the most nutrients for plants to grow.

• silt

• clay

• sand

• all the above

soils that are dry more than 50% of the year ( with no Mollic Epipedon) are considered _____.

• inceptisols

• Ultisols

• Aridisols

• Vertisols

where is the greatest deposit of eroded nutrients found?

• the great lakes

• colorado river

• lake meredith

• mississippi river

Oxisols are predominantly what color?

• red

• yellow

• gray

• brown

The ____ horizon is usually structureless and undeveloped.

• A

• B

• C

• E

Approximately ___% of a plants dry weight is phosphorus.

• 0.2

• 0.3

• 2

• 3

soils that exhibit shrink and swell characteristics.

• Andisols

• Aridisols

• Inceptisols

• Vertisols

soils is considered a biotic factor

• True

• False