Effects of cultivation patterns on rice (Oryza sativa L.) growth and yield components in saline-sodic soil in the Songnen Plain

The experiment was conducted to study the effects of two cultivation patterns on rice growth and yield components to clarify which pattern was suitable to saline-sodic soil in Northeast China in 2011. One was organic cultivation pattern, the other was conventional cultivation pattern. The rice varieties grown were Dongdao 4 (D4), Dongdao 2 (D2) and Changbai 9 (C9). Plant height, aboveground biomass, underground biomass, grain yield and yield components were collected at five sampling stages. The results showed that the plant height of D4 with conventional cultivation pattern was higher than those of D2 and C9 at the first sampling stage, and the same tendency showed also on organic cultivation pattern. Under organic cultivation pattern, the general trend of aboveground biomass was D4>D2>C9, but the trend of underground biomass was D2>D4>C9 at the first two sampling stages. On July 26 th and August 10 th , whether aboveground or underground biomass, there were no statistical differences among these three rice varieties. Under conventional cultivation pattern, the aboveground and underground biomass were D4>D2>C9 on June 27 th . The study also found that the biomass of the three rice varieties had the same tendency with organic cultivation pattern on July 26 th and August 10 th . For yield components of rice in our study, 1000-grain weight and kernel weight of D4 were significantly greater than those of D2 and C9 under both cultivation patterns. So the conclusion was that D4 was more suitable to plant than the other two rice varieties in saline-sodic soil whether with organic or conventional cultivation pattern.