Influence of climate on fruit crops
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Transcript of Influence of climate on fruit crops
Assignment on
“Influence of climate on fruit crops”
Submitted to: Dr. K. Ajith kumar
ProfessorDept. of Pomology & Floriculture
Kerala Agricultural University
Submitted by: Manohar Lal Meghwal
Ph.D I yearDept. of Pomology & Floriculture
Climate factors
Air Temperature
Air Humidity
PrecipitationWind
Solar radiation
1. Solar RadiationPermeability of protoplasm
Intake and loss of water
Enzymatic activity
Respiration
Photosynthesis
Flower initiation
Ripening of fruits
Process Effect of light
Germination Effect of dark and light requiring seeds
Stem extension Etiological effects
Leaf expansion Prolonged illumination is required for full expansion
Chlorophyll synthesis Illumination required for development of green pigment
Flower production Photoperiodism and control of flowering
Bud dormancy Photoperiodic response induced in short days
Major Light controlled process in plants
Solar radiation
Duration(SDP, LDP, DNP)
Quality (wavelength)(UVR,PAR, NIR.LVR)
Intensity (amt. of energy
transmitted)(compensation &light saturation
point)
Effect of solar radiation on fruit crop
Light intensity influence the crop growth through
photosynthesis. Production rate of photosynthates depends on
compensation point and saturation point.
Light intensity a minimum of 500-1000 ft candles is
required for effective rate of photosynthesis.
. Duration of light period influence time of flowering of
many fruit crops.
Quality of light affects the process of photosynthesis,
assimilation of nutrients and dry matter distribution in fruit
crop plants.(PAR- 0.40-0.70 micron)
Temperature
Tropical fruit crops
Subtropical fruit crops
Temperate fruit crops
2.TEMPERATURE
Effect of temperature on fruit crop
Chlorophyll synthesis and leaf area development.
Activity of PGRs are high.
Temperature greater influence germination, leaf initiation
and flowering of all fruit crops.
Seedling development is more rapid as temperature
increases.
Sunburn and sunscaldBurning of leaves and fruits, bark of
trunk may splits in extreme case.
Metabolic disturbance(Higher rate of respiration results in
stunted growth )
Heat and thermal injury(Bleaching of chlorophyll,
necrosis of fruit tissue)
Dessication(wilting of leaves and new
seedlings in tropics)
HIGH TEMPERATURE
STRESS
Effects of high
temperature on
Subtropical fruits
FRUIT LEAF
Impact of High temperature on mandarinSu
nbur
n in
Citr
us
Man
goPsuedo-fruit setting in mango.Frost affected mango plant
G
rape
s Frost and Drought stress
3. Humidity• It directly influences water relations of fruit crops and
indirectly influence leaf growth, photosynthesis,
occurrence of disease and finally economic yield .
• It effects rate of evapotranspiration and water
requirement of the fruit crops.
• High humidity favours leaf enlargement due to high
turgor pressure.
•High humidity favours easy germination of fungal
spores on plant leaves.
4. Precipitation• It is the major source of soil moisture for crop growth
in irrigated and dryland horticulture.
• Cell growth, cell wall and photosynthesis are
adversely affected by the water stress.
• Stomatal closure due to water stress restricts CO2.
•Respiration increases and sugar accumulates under
moisture stress results in reduced crop yield.
Black injury of Pineapple
Chilling injury in
Apple
5. Wind•Direction and velocity have significant influence on fruit
growth.
• Increases transpiration and photosynthesis.
•Hot wind accelerates the desiccation of crop.
•Alters the balance of hormones.
•Increases ethylene production and decreases GA3 of roots and
shoots.
•Hot dry winds causes reduction in plant height – due to cell
cant attain full turgidity.
•Crop lodging, shedding of flower and fruit drop – major injury.
Fig: Crop lodging in fruit crops
Banana Papaya
THANKS