Soil TCA 1 review

  1. What is soil?

Natural material that covers land surfaces.

  1. Which of the following is an agricultural use or uses of soil?

Used for planting crops.

  1. What do earthworms, ants, crawfish, moles, and other organisms improve?

Soil

  1. Acidic soils are considered sulfur, and alkaline soils are said to be lime.

  2. What is the term used to describe soil that has roughly equal amounts of sand, silt, and clay?

Loam

  1. What soil particle is sticky when wet?

Clay

  1. Sandy soils are considered to be

Sandy Loam

  1. What is the vertical cross section of soil?

Soil Profile

  1. The upper most layer of soil consists of an organic layer made up of partially decayed plant and animal debris?

Humus

  1. When a soil profile is exposed, soil horizons or layers  of soil become apparent.

  2. What is the mixture of the composition of the soil particles called?

Soil texture

  1. What is the ease with which air and water may pass through the soil?

Soil permeability

  1. What basic textural class contains clay, silt, and sand?

Loam

  1. What soil particle creates very small pore spaces, resulting in poor aeration and 

poor water drainage?

Clay

  1. What is true of basic or alkaline solution?

Ph greater than 7

  1. What can be added to amend an acidic soil?

Lime

  1. What happens to soil nutrients when pH is very high or very low?

Soil nutrients become less available to plants

  1. What is the best soil pH for nutrient uptake?

6.5

  1. What soil pH would benefit from the addition of lime?

Below 6.0

  1. To which soil horizon does soil erosion caused by deforestation have the biggest impact?

A horizon

  1. To which soil horizon has the highest concentration of humus?

O horizon

  1. What is the movement of organic matter, chemical substances, and mineral particles from the upper horizons of soil to the lower horizons by the downward movement of water?

Leaching

  1. What type of soil would need lime more often?

Acidic soil

  1. What influences soil pH?

Parent material, organic matter, rain, human activity

  1. A change in pH number down 1, means the soil is how much more acidic?

10 times more acidic

  1. Most plants will do well in a soil with a pH of....

6.0-7.0

  1. A soil that is strongly alkaline is…

Ph that's greater than 9

  1. What is the scale used to measure soil acidity?

Ph scale

  1. What can be added to soil to reduce the acidity ( raise the pH)

Lime

  1. What can be added to soil to lower the acidity ( drop the pH)

Sulfur

  1. Which soil particle creates a very small pore space?

Clay