Phosphorus Flashcards
There are _ nutrients essential for plant growth and crop production
17
Micronutrients include (bcc)
Boron
Chloride
Copper
Molybdenum, zinc, nickel are _ nutrients
Micro
Carbon, hydrogen, oxygen are obtained from (2)
Air
Water
Phosphorous is essential for plants to
Harvest suns energy and convert it into growth and reproduction
Without an adequate supply of P, plant growth is
Diminished
Without an adequate supply of P, plant maturity is
Delayed
Without an adequate supply of P, yields are
Reduced
Phosphorus is returned to soil when
Plants die
When P is returned to soil, it can be used by (2)
Soil microorganisms
Other plants
P cycle continues until it becomes fixed in
Sedimentary rocks at the bottom of the sea
P is released from sedimentary rocks at the bottom of the sea when
Rock surfaces and is weathered
Nutrient uptake by crops depends on
Nutrient supply in soil
Nutrient uptake by crops depends on root _ area
Surface
Nutrient uptake by crops depends on root _
Activity
Roots are able to absorb only nutrients that
Come into contact with living or active cells
P uptake is dependent on
Condition of plant’s root system
Nutrients contact root system by three mechanisms (3)
Diffusion
Mass flow/bulk flow
Root interception
Diffusion is the
Movement of molecules through the soil
(Diffusion) _ determines how long it takes for nutrients to reach the roots (2)
Size of particles
Moisture levels
_ provide a more direct path to the roots surface (2) (diffusion)
Higher water content
Smaller soil particle size
