Lecture 8

Question 1

effect of salinity

Answer 1

osmotic potential of soil exceeds plant somotic potential

Question 2

effect of sodicity

Answer 2

proportion of na exceeds other cations, reduces inilftration, o2 suplu, water supply to plant

Question 3

effect of toxicity

Answer 3

level of certain solutes high enough to damage plamnt growth directly or undirectly

Question 4

do a water balance for the root zone

Answer 4

I + P + G= Et + Dp

Question 5

6 things you can do for salinity management

Answer 5

irrigation water requirement
irrigation interval
crop type
seed location
plant density
infiltration

Question 6

what is bledning and what is cycling

Answer 6

blending, mixing saline iwth nion salnine water

cycling, using low saline water for initial stages, high saline for end

Question 7

two ways for reclemation, which is faster

Answer 7

ponding-faster, waste of water and can lead to other problems
intermittent flooding, slower, more efficient

Question 8

what is K for boron, and why

Answer 8

K=0.6 because it needs more leaching than na

Question 9

what are the 5 salt balance equations

Answer 9

soluable
dont precipitate
rainfall salt negligible 
fertiliser salt negligible 
salt through crops negligible