roots and soil

Question 1

physical restraints of roots

Answer 1

mechanical/strength
hydro-logical
aeration; root respiration & microbes

Question 2

losses of nutrients from soil

Answer 2

absorption from solids
locked up in organic matter
gaseous
leaching

Question 3

what can cause immobilisation of nutrients?

Answer 3

Hay bales

Question 4

root stresses

Answer 4

compaction
toxins
water
pressure

Question 5

loss of anions from soils _________ pH

Answer 5

increases (high)

Question 6

loss of cations from soils _________ pH

Answer 6

decreases (low)

Question 7

abiotic factors affecting growth

Answer 7

low nitrogen
high salinity
drought
heavy metals