The effects of oxygenincreasing patterns in paddy fields on rice yield formation and grainfilling dynamics were investigated in a twoyear field experiment (2008-2009) under three oxygenincreasing patterns, including application of urea peroxide as topdressing (T1), application of calcium peroxide as topdressing (T2) and drywet alternate irrigation (T3), with continuous submerged irrigation as control (CK). The Richards equation was used to simulate grain filling processes of two rice genotypes (Guodao 1 and Xiushui 09) under different oxygenincreasing patterns. Compared with the control (CK), the yields of Guodao 1 (indica) under T1, T2 and T3 were increased by 11.6%, 8.5% and 13.6% in 2008 and 16.8%, 14.4% and 23.0% in 2009; Similarly, the yields of Xiushui 09 (japonica)under T1, T2 and T3 were increased by 6.6%, 9.2% and 9.4% in 2008， and 14.6%， 17.2% and 17.4% in 2009, respectively. Rice grainfilling process fitted well with the Richards equation(R2>0.989), and the main effects of oxygenincreasing patterns on rice grainfilling were as follows: 1) Maximum grain weight of inferior and superior grains were both increased with smaller difference in grain weight between the two genotypes and improved grainfilling synchronism; 2) Inferior grains of the two rice genotypes had a full grain filling process. The oxygenincreasing patterns extended the grainfilling duration of inferior grains of Guodao 1, and increased the grainfilling rate of inferior grains of Xiushui 09. 3) Full grainfilling of the inferior grains was mainly contributed to higher seed setting rate and yield of the genotypes under the increasingoxygen patterns in paddy fields .
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