Dryland cropping is possible with. ⢠low plant density. ⢠low plant density. ⢠low soil cover â low ET. ⢠deep rooting systems in deep soils â high water storage ...
Climate change: Are you ready? Breakout session 2 Horticulture and plants Pedro Aguiar Pinto Technical University of Lisbon
England and Portugal London: 51 32 N
Lisbon 38 44 N
Main climate differences Average monthly air temperature
25
London Lisbon 20
15
10
longer growing season 5
0 January
February
March
April
May
June
July
August
September
October
November December
ry
ar ch
ay
be r
t
De ce m
be r be r
No ve m
O ct ob er
Se pt em
Au gu s
Ju ly
Ju ne
M
Ap ril
M
100
Fe br ua ry
Ja nu a
Rainfall (mm)
Rainfall
120
• Annual rainfall Lisbon London
– Lisbon 752 mm – London 754 mm
80
60
40
20
0
Seasonal rainfall pattern Mora (617 mm)
20%
39% 6%
Spring Summer Fall Winter
35%
Water deficit during the growing season Rainfall
ETo
Soil water
mm
180 155 Soil moisture utilization
130 105
Rainfall surplus Rainfall deficit
80 55 30 5 -20
J
F
M
A
M
J
J
A
-45 -70 -95 -120
Mean soil water balance (ETo Penman)
S
O
N
D
High annual variability (Mora 80 km from Lisbon ) 925 Annual rainfall variability 850
775
700
30 year average = 617 mm
625
550
475
400
325 1955
1960
1965
1970
1975
1980
1985
Mediterranean climate
Dryland cropping is possible with • low plant density • low soil cover
low ET
• deep rooting systems in deep soils high water storage capacity
Surface water storage
Environmental conditions Mean air temperature: 7.5 - 17.5 C
Actual ET: 400 - 800 mm
Rainfall: 400 - 2800 mm Solar radiation: 140-170 kcal/cm2
