Unit 02- Requirements For Crop Growth Flashcards
(T/F) Soil structure describes the proportion of sand, silt and clay particles present in the soil while soil texture refers to the arrangement of these soil particles into aggregates
False
Top soil is the most productive soil layer because…
It is where most organic matter is found
The process by which organisms can take nitrogen from the atmosphere and convert it to soil nitrogen is..
Biological Nitrogen Fixation
The macronutrient that is difficult to manage because it is very strongly held by most soils is:
Phosphorous
In conservation tillage operations at least _____ of the soil surface is covered with plant residues.
30%
We generally do NOT find nutrient deficiencies associated with the following soil condition:
Soils with high organic matter contents
The Haber-Bosch process is the industrial process used to produce:
Nitrogen fertilizers
The first trophic level of a soil food web consists of:
Plants
Which of the following statements about soil organic matter is NOT true:
a) Soil organic matter is biologically derived
b) Soil organic matter usually constitutes between 1 and 5% of a mineral soil
c) Soil organic matter is a very homogeneous mixture of materials
d) Soil organic matter constitutes approximately 30% of an organic soil
e) Soil organic matter is very important for soil structural stability
C
Nitrification describes the process whereby:
Ammonium is converted into nitrate (the more plant available form of nitrogen)
The following is a broad spectrum herbicide used to kill broad-leaf weeds and grasses
Glyphosate
The following is the commonly used insecticide linked to Honey Bee Colony Collapse Disorder
Neonicotinoids
(T/F) System pesticides are pesticides that kill as a result of direct contact
False
The environmentally sensitive approach to pest control that uses pesticides judiciously is called:
IPM
(T/F) A soil with greater than 30% organic matter is considered to be an organic soil.
True
