Lecutre 6 Flashcards
1
Q
two types of drip irrigation
A
flat pipe-temporary
rigid pipe- left for more than one year
2
Q
characteristics of drip (3)
A
low aplication rate
close to plant
pressure reducers
3
Q
componenets of drip system
A
water source pump fertigation unit pipe drippers pressure reducers filtration
4
Q
advantages of drip
A
low et field access low pressure reduce water requirements timing low labour
5
Q
disadvantages of drip irrigation
A
high cost high energy due to pumping high skill salinity short life span
6
Q
what is sub irrigation
A
uses natural capillary rise to irrigate,
7
Q
characteristics of sub irrigation
A
need high water table
often for shallow rooted crops (plants dont like roots in saturated zone)
peat
8
Q
advans of sub (field and greenhouse)
A
field
no skill, labour, cost
greenhouse
timing, amount, bunk beds
9
Q
sub disadvantages (field and greenhouse)
A
FIELD no control maintenance slow can run out high indirect costs
GREENHOUSE high running costgs skills labour investment energy
10
Q
what is sub surface irrigation
A
water applied directly to root zone
pressurised or gravity fed
11
Q
advans of subsurface
A
reduce ET field access diretly to root zone low labour good for plants that dont like water on leaves
12
Q
disadvantages of subsurface
A
access to system cloging field cultivation saliity high cost high skill
