Agro climatic requirement

Climatic requirement

• Climate of Karnataka - humid to sub-humid.
• Rice heat and water loving plant, requiring high temperature and adequate moisture supply.
• Temperature                                                                                          
  • Germination - minimum of 10^oC                                                                  
  • Flowering - 22-25^oC                                                                                                      
  • Grain formation - 20-21^oC.                                                                                       
  • At ripening - 20-25^oC.
  • Low temperature particularly during 10-11 days before heading causes considerable loss in grain yield because of sterile spikelets.
• Radiation                                                                                                                   
  • Rice is a short day, thermosensitive plant but now many thermoinsensitive varieties have been developed.
• Rainfall                                                                                                                      
  • Grown in areas receiving 1000-1500 mm rain.                                        
  • Crop needs heavy rains (125 mm) during vegetative phase and 200 mm monthly rain for low land and 100 mm for upland.
• In India - grown from 8^o to 35^o north latitude from sea level to mountainous regions up to 3000 meters.
• Heavy winds especially after heavy rainfall or heavy irrigation results in severe lodging.