关键词: 再生稻[49EJ], 抽穗期, 穗部性状, 相关性[49EH]

Abstract: The heading progress and the relationship between the heading date and the economic characters of rice ratooning were observed. The results were summarized as follows:The heading duration of rice ratooning was nearly one month. The heading speed were slow at the early and late stage, and quick at the middle stage(from Sept. 4 to Sept 13). The ratoon plants origined from the second node of the mother stem would head earler and has shorter heading duration than those origined from the fourth and third node. The early heading panicles had more filled spikelets per panicle, higher percentage of filled spikelets and heavier 1000-grain weight than the late heading ones especially those headed after Sept. 13. Among the economic characters, the filled spikelets per panicle was the one mostly affected by the heading date. The economic characters of the ratoon plants origined from the second node of the mother stem were less affected by the heading date than those origined from the fourth and third node.

Key words: RATOON RICE, HEADING DATE, ECONOMIC CHARACTERS, CORRELATIONS