topics 5 and 6 quuiz Flashcards
Organic food is produced without the use of chemical pesticides or fertilizers
true
Dandelions are plants that are native to North America
False
what problem is do to pesticide use
soil residue builds up
Encouraging bluebirds to live on a farm as a means to control grasshoppers is an example of
biological controls
Technology by which plants are grown without soil
hydroponics
Parent material in soil refers to
the mineral matter (rock, clay, sand) from which soil develops
Soil erosion can cause
desertification
Layers in the soil are called
horizons
Most bacteria in soil are dangerous to people and cause illness
false
Healthy growing plants require six nutrients in the soil
nitrogen, phosphorus, potassium, sulphur, calcium, & magnesium
Which of the following does not contribute to salinization
Shelter belts
Which is a method farmers use to help save their soil
Planting shelter belts