Table 5.

Dynamics of net photosynthetic rate in the second leaf from the top under the treatment of nitrogen deficiency and compensation in 2015.

Treatments	5 days after compensation (mmol m-2 s-1)	10 days after compensation (mmol m-2 s-1)	15 days after compensation (mmol m-2 s-1)	20 days after compensation (mmol m-2 s-1)	Heading stage (mmol m-2 s-1)
CK0	23.20b	22.20c	20.57b	19.23c	21.93b
CK1	30.77a	32.47a	29.70a	26.53b	28.13a
CK2	30.50a	29.70a	29.73a	29.57a	29.23a
T1	30.26a	32.30a	31.50a	29.80a	29.10a

CK0, N fertilizer was not supplied during all stages of growth (blank control); CK1, constant supply of N throughout different stages of growth; CK2, constant N compensation at young panicle differentiation stage, after N deficiency at tillering stage; T1, double N compensation at young panicle differentiation stage, after N deficiency at tillering stage. In 2015, values in the same column show means of the Tukey’s multiple range test, and different letters indicate that the means were statistically different (P < 0.05), n = 4. Data are averages observed for the study year of 2015 (n = 3, 1 year × 3 replicates).