Effects of Oxygen-Increasing Patterns in Paddy Fields on Rice Grain-Filling
Year: 2011
Type: article
Abstract: The effects of oxygen-increasing patterns in paddy fields on rice yield formation and grain-filling dynamics were investigated in a two-year field experiment(2008-2009) under three oxygen-increasing patterns,including application of urea peroxide as topdressing(T1),application of calcium peroxide as topdressing(T2) and dry-wet 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 oxygen-increasing 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 grain-filling process fitted well with the Richards equation(R20.989),and the main effects of oxygen-increasing patterns on rice grain-filling 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 grain-filling synchronism;2) Inferior grains of the two rice genotypes had a full grain filling process.The oxygen-increasing patterns extended the grain-filling duration of inferior grains of Guodao 1,and increased the grain-filling rate of inferior grains of Xiushui 09.3) Full grain-filling of the inferior grains was mainly contributed to higher seed setting rate and yield of the genotypes under the increasing-oxygen patterns in paddy fields.
Source: Zhongguo shuidao kexue
Author: Chunmei Xu
Institution: China National Rice Research Institute
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2381189957