Term
| water is polar, why is this important in soil and how does it affect it? |
|
Definition
water attracted to soil as it is (-)
interacts with surfaces, cohesion and adhesion |
|
|
Term
| what is the difference between adhesion and coheion? |
|
Definition
adhesion: btwn water molecules
cohesion: btwn H2O molecules and surfaces(meniscus) |
|
|
Term
| what happens during capillary rise and how is this associated with soil? |
|
Definition
As the radius increases height decreases!
more surface tension, and gravity working against water.
Soil is like the glass capillary because of the pores in the soil that absorb water. size of pores dictates height of water in soil. |
|
|
Term
|
Definition
| the height for capillary/soil |
|
|
Term
|
Definition
| The larger they are the more aeration is possible. Large/coarse material is optimal for aeration. |
|
|
Term
| which texture would have the largest capillary action? |
|
Definition
clay but it would take the longest
sand least |
|
|
Term
| hydraulic potential is made up of? |
|
Definition
gravitational: can be _/+ depending on reference point! above R.P =+
matric:forces btwn adhesion and cohesion, always (-)
pressure: always(+) only occurs below water table
plant water uptake osmotisis: always(-) |
|
|
Term
|
Definition
=10.2m water
=1020cm water
=100KPa |
|
|
Term
field capacity
Wilting point occurs at?
Available water is ? |
|
Definition
FC:free drainage has stopped: -1/3 bar
WP:-15 bar, plants permanently wilted
AV difference btwn FC and WP |
|
|
Term
| effects of increased OM to water retention? |
|
Definition
WP: small increase
FC: large increase
AW:increase |
|
|
Term
| what is the significance of hydraulic conductivity? |
|
Definition
def: ability for soil to transmit water through pores.
significance: drainage, leaching, septic fields, retention of water in ponds etc. |
|
|
Term
|
Definition
| what is wrong with the flux in darcy's experiment? |
|
|
Term
| what are part of the natural cycle that contribute to water gain/loss? |
|
Definition
precipitation
evapo-transpiration
runoff
groundwater outflow |
|
|
Term
| tile drainage affects and types? |
|
Definition
affects:reduce water logging, increase draiange
types:plastic and stone/clay. |
|
|
Term
|
Definition
trickle
gun
later movement
center pivot |
|
|
