目录
摘要 Ⅲ
关键词 Ⅲ
AbstractⅢ
引言
引言
1 材料与方法2
1.1 试验设计2
1.2 测定项目与方法2
1.3 数据处理与分析3
2 结果与分析3
2.1 产量及产量构成因素3
2.2 播期对冬小麦生育进程的影响4
2.3 对拔节期茎蘖数目及成穗率影响5
2.4 对株高和穗下节间长度的影响6
2.5 对开花期氮平衡指数的影响6
2.6 对开花期不同部位叶面积指数的影响7
2.7 对开花期不同部位冠层光截获的影响7
2.8 对群体光合速率和群体呼吸速率影响7
3 讨论8
致谢9
参考文献9
播期和密度对徐麦33冠层结构及产量的影响
摘要
由于江苏优质粳稻的大力推广、水稻小苗机插和直播轻简化技术发展以及气候变化的影响，不同程度推迟了稻茬小麦的播种时间，导致稻茬小麦产量下降。为了适应气候和稻茬小麦生产方式的变化，从小麦的群体特征和冠层结构出发，明确不同播期下适宜的播种密度以增加产量，有利于小麦生产的高产稳产。在睢宁试验基地进行主要栽培措施试验，设置两个播期、三个密度，以构建不同群体，研究稻茬麦不同栽培措施下群体性状差异。研究结果表明，当播期相当于适播推迟21天后，其生育期、产量和穗数下降明显，分别为15.51%和13.47%，下部叶面积指数和冠层光截获率也降低；适当增加密度可以提高总茎数及单位面积上穗数，也增加了叶面积指数和光合作用能力，产量也提高了12.97%。由此可见，晚播减产是由于大幅度降低了穗数，单位群体数目减少，冠层光截获率和光合作用能力减弱；但晚播下适当的增加密度可以构建良好群体从而提高产量。
EFFECTS OF SOWING DATA AND DENSITY ON CANOPY STRUCTURE AND YIELD OF WHEAT FOLLOWING RICE
ABSTRACT
Due to the promotion of highquality *51今日免费论文网|www.51jrft.com +Q: &351916072& 
Japonica Rice in Jiangsu Province, the development of rice seedling transplanting and direct seeding light simplification technology, and the influence of climate change, the sowing time of wheat after rice is delayed to some extent, resulting in the decrease of wheat yield after rice. In order to adapt to the climate and production mode changes of wheat after rice, based on the population characteristics and canopy structure of wheat, the suitable sowing density under different sowing dates is determined to increase the yield, which is conducive to the yield of wheat production highly and stably. The experiment of main cultivation measures was carried out in Suining experimental base. Two sowing dates and three densities were set up to construct different groups. The results showed that the growth period, yield and spike decreased significantly (15.51% and 13.47%, respectively) when the sowing date was 21 days later than that of the suitable sowing, and the lower leaf area index and canopy light interception rate also decreased; the total stem number and spike per unit area, leaf area index and photosynthesis ability were increased, and the yield was also increased by 12.97%. It can be seen that the yield reduction of late sowing is due to the significant reduction of the number of ears, the reduction of the number of unit population, and the decrease of the light interception rate and the photosynthetic capacity of the canopy; however, a proper increase of density under late sowing can build a good population and improve the yield.

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