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Presented By
Kawsar Ahmad,
Ashiny Chandra Pal
Agricultural Engineering & Technology
Sylhet Agricultural University
Thermoperiodism
Definition :
Thermoperiodism :
A phenomenon in which growth or development is promoted by alternating
day and night temperatures.
Fig : Plant & Temperature
Temperature for plants
Fig : Optimum Temperature for plants
Cold Temperature = <10oC
Optimum Temperature = 11-24oC
High Temperature = >25oC
Effect of Thermoperiodism on
Plants and Animals :
Reproduction
High Temperature favors tuber production
Growth and Development
Morphology
Helps in photosynthesis
Seed germination
Flowering
Productivity
Disadvantages :
 Too high or too low temperature prevent fruit set
 Adverse temperatures also cause poor quality
 Not all plants grow best in the same temperature
range.
 Low temperatures can result in poor growth
 Photosynthesis slows at low temperatures
 Since photosynthesis is slowed, growth is slowed
and this results in lower yields.
Thank You

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Thermoperiodism

  • 1. Presented By Kawsar Ahmad, Ashiny Chandra Pal Agricultural Engineering & Technology Sylhet Agricultural University Thermoperiodism
  • 2. Definition : Thermoperiodism : A phenomenon in which growth or development is promoted by alternating day and night temperatures. Fig : Plant & Temperature
  • 3. Temperature for plants Fig : Optimum Temperature for plants Cold Temperature = <10oC Optimum Temperature = 11-24oC High Temperature = >25oC
  • 4. Effect of Thermoperiodism on Plants and Animals : Reproduction High Temperature favors tuber production Growth and Development Morphology Helps in photosynthesis Seed germination Flowering Productivity
  • 5. Disadvantages :  Too high or too low temperature prevent fruit set  Adverse temperatures also cause poor quality  Not all plants grow best in the same temperature range.  Low temperatures can result in poor growth  Photosynthesis slows at low temperatures  Since photosynthesis is slowed, growth is slowed and this results in lower yields.