关键词: 粳稻, 水直播, 穗部结构, 产量, 品质, 寒地

Abstract: Direct seeding rice has been expanding in Heilongjiang Province year by year. In order to understand the effects of water direct seeding cultivation techniques on yield and quality of rice in cold area, Hulin City and Fuyuan County, two larger water direct seeding rice producer of Heilongjiang Province were investigated. The results showed that the effect of water direct seeding on panicle length, primary branch number and secondary branch number of Jinhe 1 were less than Longjing 31. The yield of Jinhe 1 and Longjing 31 reached 7.78 t/hm2 and 8.73 t/hm2 under water direct seeding, respectively, significantly lower than transplanted rice. The low yield of water direct seeding was due to the signficant decreased in grain weight. The milled rice rate, head rice rate and protein content of Jinhe 1 and Longjing 31 of water direct seeding rice were lower than transplanted rice. The amylose content was higher than transplanted rice, but the difference were not significant. The chalky rice rate and chalkiness degree of Jinhe 1 under water direct seeding were significantly lower than transplanted rice. The chalky rice rate and chalkiness degree of Longjing 31 were not significant among different cultivation methods. The taste score of two varieties in two cultivation methods were also not significant.

Key words: cold area, japonica rice, water direct seeding, panicle structure, yield, quality