spring frost risk in orchards - forecast and protection methods cnr-institute of biometeorology...
TRANSCRIPT
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SPRING FROST RISK IN SPRING FROST RISK IN ORCHARDS - FORECAST ORCHARDS - FORECAST AND PROTECTION AND PROTECTION METHODSMETHODS
CNR-Institute of Biometeorology Bologna
Meteorological Service Regione Emilia Romagna
Federica Rossi, Franco Zinoni
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Scarring, distortion, russet
Spring frosts: when temperature falls below the melting point (0°c) sensitive crops can be injured
Style, ovary, petals necrosis Dehydration, brown tissues
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Whether or not there is frost damage at a particular minimum temperature
plant species, crop variety, hardening, cultural practices (pruning, fertilization, irrigation), presence of INA bacteria, weather conditions.
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Most countries with temperate climates experience frost damage to crops and even tropical countries can have frost damage at high elevations.
Coffee region
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Farmers have been always Farmers have been always cohabiting with such a cohabiting with such a meteorological hazardmeteorological hazard
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More sensibile cvs
Cultural practices
Climate change: higher winter temperatures early blooming. Increase of low-temperature episodes in spring
Now….
Needs to protect local and traditional crops (sustainable- GAP)
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Average economic losses due to the occurrence of late frosts - Emilia Romagna
300 M Euros
38% Gross Production Value
65 M Euros
50 % Gross Production Value
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Define meteo & micrometeorological conditions during frost events
Develop knowledge and instruments able to evaluate the risk
Define the more appropriate methods for protection in relation to the climatic hazard and sustainable resources management
Communicate to farmers how to avoid or mitigate the detrimental effects (active-passive protection)
How to improve frost protection ?
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Passive protection (low-cost – high-benefits)
Awareness of the meteorological risk
Selection of low-risk sites
Avoid low-spots, select slope orientation
Planting species and cvs blooming later in the spring
Maintain soil water content to obtain high thermal diffusitivity
Minimizing or removing cover crops
Proper pruning, nutritional management
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Active protection (high costs)
Awareness of the meteorological risk
Selection of the appropriate protection method:
•Crop
•Location
•Climate
•Costs
Effectiveness
Efficiency
Risk
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High effectiveness (all kind of freezing)
Low efficiency
Active protection
High consumption rates (50 % of efficiency)
Expensive to operate (2000 €/ha/night)
Total efficiency is proportional to the number of heaters and depending on the air temperature
Heaters
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Active protectionBreak up of b.l. – mixing of warm air aloft with surface colder air
Effectiveness: radiative frosts
Efficiency:
low labour requirement, low operational costs (10 €/ha/h) but high capital cost and high ‘standby’ charges. Possible in every location. Environmental friend, but noise pollution
Wind machines
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Active protection
Water freezing: when 1 Kg of water freezes at 0°C, the phase change converts 334 kJ of latent to sensible heat
Efficiency:
Low operational costs. High installation costs but sprinklers can be used for irrigation, fertilizer applications, evaporative cooling…Disadvantages: large amounts of water needed
Over-plant sprinklers
Under-plant sprinklers
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Uniform application, continuous and adequate water amounts. Problems under windy conditions. Errors in operating (late starting, early stopping, accidental interruptions) can induce major damages
Over-plant sprinklers
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Under-plant sprinklers
The goal is to maintain the wetted cover crop temperature near 0°C
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Efficiency:
Intermittency low amounts of water (higher sustainability, lower costs).
The same sprinklers can be used for irrigation.
Useful to protect large surfaces
Effectiveness: Radiation frosts
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Meteorological Base S.Pietro Capofiume 44°65’N – 11° 62’E 11 m a.s.l.
Test- site for microclimatic characterization to identify the atmospheric features correlated to frost events
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26 January 2000 23:00 GMT
0
100
200
300
400
500
600
700
800
900
-5 -4 -3 -2 -1 0 1 2
Temperature (°C)
Hei
gh
t (m
)
22.5 cm
50 cm
100 cm
200 cm
400 cm
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Radiation frosts: calm wind - clear sky: heat is lost in form of radiant energy. Temperature falls faster near the surface causing a temperature inversion
ATMOSPHERE STATUS - CLOUD COVER ARE THE MAIN FACTORS CONDITIONING SPRING FROSTS
To optimize orchard protection, it is important to understand the interaction between radiation and turbulent processes in complex canopies.
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Evaluation of the effectiveness in orchards:
Micrometeorological observations - energy and radiation balances
Air and plant tissue temperatures
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+ 3°C
Irrigated Non irrigated
Temperature °C
He
igh
t (c
m)
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-4
-3
-2
-1
0
1
2
3
4
5
22:3023:3000:3001:3002:3003:3004:3005:3006:30
Ora solare
T (°
C)
T air at ground
T air 2 m
h= 2m
h= 1m
Under-canopy irrigation: the temperature of the lower part of the canopy becomes higher because of the release of latent heat.
-4
-3
-2
-1
0
1
2
3
4
5
22:3023:3000:3001:3002:3003:3004:3005:3006:30
Ora solare
T (
°C)
T air at ground
T air 2 m
h= 2m
h= 1m
Bud t (under-canopy irrigation
Bud t (over-canopy irrigation)
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WHY FARMERS NEED PREVISIONS ?
Sensibilità al gelo - danno del 10 %
-16
-14
-12
-10
-8
-6
-4
-2
0
germogliamento fioritura allegagione frutticini
fase di sviluppo
T (
°C)
Actinidia
Albicocco
Pesco
Pero
10% damage
kiwi
apricotpeachi
peari
apricot
Awareness of the risk
Active protection
What a probability for a frost occuring tonight? Can the thermal levels predicted compromize my crops at this stage ? Shall I activate my protection devices? What will be the ratio cost sustained/cost of the possible damage?
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Frost forecasting target
7 – 2 days forecast EPS
2 – 1 day EPS-Kf
< 12 hrs Nowcasting
Reclamation consortiums to make
water available
Farmers to dispose protection devices
Alert to activate and optimize protection
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Rischio gelo nelle prossime nottiRiceviamo dall'ARPA-SMR e diffondiamo il seguente bollettinoARPA - Servizio MeteorologicoVenerdì 4 aprile 2003Speciale Bollettino Agrometeorologico per Rischio Gelate. A seguito della perturbazione che ha interessato la regione a partire da Mercoledì 2 Aprile e prodotto piogge diffuse ed un notevole calo delle temperature massime, è previsto l’arrivo di aria fredda e secca da nord-est che apporterà condizioni di cielo sereno o poco nuvoloso . Queste condizioni sono favorevoli a forti abbassamenti termici dovuti sia all’arrivo di aria fredda (avvezione) che alla perdita di calore dal terreno durante la notte (irraggiamento).Nei prossimi giorni sono quindi previste intense gelate. La temperatura dovrebbe scendere al di sotto dello zero nella notte tra Domenica 6 e Lunedì 7, ma i valori potrebbero essere ancora più bassi nella notte successiva, tra Lunedì 7 e Martedì 8
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Awareness of the risk
Passive protection
Selection of low-risk sites !!!!
WHY FARMERS NEED PREVISIONS ?
Crop selection
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A regional topoclimatic model including phenological and growth models is under
development to be used operationally
•Definition of the risk maps for the
different crops •Weekly agrometeorological bullettins•Climatic regional data-base for land
capability
seaznrelmin IbHaT
valley top
valley bottom
computation pointH c
H f
D c
D f
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Topoclimatic analysis to create frost risk maps as a tool for agricultural land planning and site selections
Climatologic component Geographical component
Spatial interpolations of previsional data from meteo
models
Frost index values for the different species
Generation of DEM:
Plan & hill domains
Correlation analysis between orography and climatic variables
Minimum temperature prediction maps
Correlation between frost indexes and minimum temperatures
Biological component
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Needs:
•to improve accuracy and resolution of DEM
•take into account other meteo variables affecting frost
•more and proper distributed meteo stations
•remote sensing imagery to retrieve night surface temperature maps
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Thank you