Soil water Flashcards
1
Q
importance of soil water
A
- crop requirement
- solvent
- chemical reactions
- transport
- air and temp regulator
- microbial activity
- environmental implications
2
Q
saturated water content
A
all the soil pres are water filled
3
Q
gravitational water
A
the water held in a saturated soil which will drain away under gravity
4
Q
field capacity
A
when all the gravitational water has drained away after heavy rain
5
Q
permanent wilting point
A
when the plant can no longer obtain water rapidly enough to recover turgidity overnight
6
Q
available water
A
the amount of water held in the soil between the limits capacity and wilting point
7
Q
unavailable water
A
the amount of water held in the soil beyond permanent wilting point
8
Q
soil water tension
A
- prevents soil from draining under gravitational force to dryness
- prevents plants from utilising water at permanent wilting point
- largely explain water retention
9
Q
Relationship between soil water tension and pore size
A
d = 3/h
d (mm) - diameter of the tube
h (cm) - height of capillary rise
