淮北稻茬超高产小麦碳氮代谢特征研究

研究了淮北稻茬超高产小麦植株碳、氮代谢特征 ,分析了不同器官的碳、氮变化动态 ,表明超高产小麦氮含量生育前期较低 ,返青～拔节期达峰值 ,开花后较低 ,但碳含量、C/N中后期显著高于高产和中产群体。超高产小麦开花前叶片氮含量变化较小 ,茎鞘中以拔节期高 ,不同蘖位养分量的高低是导致各蘖位分蘖成穗率高低的主要原因。提出了高产小麦不同生育期C、N指标

Carbon-nitrogen Characteristics of Super-high Yielding Wheat after Rice in Huaibei Region

Carbon nitrogen characteristics of super high yielding wheat after rice in Huaibei region were studied during 1992~1995. The results were as follows, N content of super high yielding wheat after rice was lower in early stage and after the anthesis, and higher from the reviving stage to the elongation stage than the middle yielding wheat, but C content and C/N was higher than high and middle yielding wheat in the middle stage and the days to matureity. N content in leaves of super high yielding wheat were changed littler before the anthesis , but N content in stem and leaf sheathes was higher in the elongation stage. The nutrient content greatly affected the rate of spike bearing.