Effect of Irrigation to Winter Wheat on the Radiation Use Efficiency and Yield of Summer Maize in a Double Cropping System

Table 2

Effect of irrigation during the winter wheat growing season on the PAR reflection ratio, PAR penetration ratio, and PAR capture ratio in summer maize canopy (%).

Treatments	PAR reflection ratio	PAR penetration ratio	PAR capture ratio
T0	3.8^a	20.4^a	75.8^d
T1	3.7^a	16.1^b	80.2^c
T2	3.3^a b	14.5^c	82.2^b
T3	2.9^c	11.7^d	85.4^a

The data was the average values on August 20, Aug 27, and Septemper 5, 2002; and Aug 24, and Sep 9, 2003; and Aug 19, Aug 20, and Aug 22, 2005. Values followed by a different letter are significantly different at 5% probability level.