| 摘要: |
| 同一海拔随播期的推迟，叶面积增长速度加快，最大叶面积指数升高，而最大叶面积出现的生育期推迟，保持较大叶面积的时间缩短，灌浆期叶面积衰亡速度加快，同时，晚播使干物质生产的速度在插秧后至减数分裂期较快，而使灌浆期物质累积速度减慢；分蘖期及孕穗期的作物生长率随播期的推迟变化较平稳略呈上升的趋势，而结实或变化稍大，有下降趋势。结合产量分析认为，低海拔地区宜于4月上旬播种，中海拔地区适宜4月上中旬播种，高海拔区4月中旬播种较合适。 |
| 关键词: 水稻,海拔,播期,物质生产 |
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| Abstract: |
| In the same altitude, with the sowing date postponed, the leaf area increased more rapidly,the maximum leaf area index became to be higher and tended to occur later, but decrease more rapidly. In the early stage the dry matter accumulated more quickly but became slower after heading. The final dry matter were smaller with sowing date postponed. The crop growth rate increased slightly before heading but decreased after heading. Considering the yield result, the suitable sowing date in low altitude area is around the first ten days in April, in middle area 5 days later, and in high area the second ten days. |
| Key words: rice,altitude,sowing date,dry matter, |
