Crop Coefficients for: Sunflower
Temperature Limits for Growing Degree Day Estimation
Upper Limit = 99.0 F
Lower Limit = 50.0 F

Coefficient and GDD accumulation at the beginning 
of each growth stage for various maturity groups:

STAGE	    	  KC
Early veg.	0.10	0.0	0.0	0.0
Bud format	1.00  680.0   680.0   680.0
Flower ini	1.10  800.0   800.0   800.0
50% Disk F	1.15 1035.7  1100.0  1164.3
Early Seed	1.15 1350.0  1500.0  1650.0
Late Seed	1.15 1664.3  1900.0  2135.7
Mature		0.20 1900.0  2200.0  2500.0