中文摘要：

以宁麦13号为供试品种,设置播期和密度共16个处理,研究其对小麦生育期、产量及产量结构的影响。结果表明：（1）播期对拔节期、营养生长期和全生育期影响较大,对生殖生长期和成熟期影响较小。（2）穗数随播期推迟而下降,随密度增加而增加;播期在10月26日～11月15日或密度在8万～16万/667m^2,对粒数和粒重影响不大,超过此范围,粒数和粒重明显下降。（3）播期与密度互作明显,10月26日～11月15日播期与基本苗12万～16万/667m^2组合,利于达到适宜穗数;10月26日～11月15日与8万～16万/667m^2组合,利于形成大穗和提高粒重;10月26日～11月15日与12万～16万/667m^2组合,利于获得较高产量。（4）在气候变暖背景下,苏南地区小麦适宜播期为11月1日～10日,适宜基本苗在12万～16万/667m^2。

英文摘要：

In order to study effects of sowing date and planting density on wheat growth period,yield and yield components,taking wheat cultivar Wuyujing 23 as test material,16 treatments of sowing dates and planting densities was studied.The testing variety is Lingmai 13.The test results are as follows：（1）Sowing dates have greater impact on jointing stage,vegetative growth stage and whole growth stage,but have less impact on reproductive growth stage and the maturity stage.（2）Ears decrease with later sowing date and increase with higher density.Grains per ear and 1000 grains weight have been little effect under sowing in October 26 to November 15 or the density from 80,000 to 160,000/667m^2,but the grains and the weight obviously decrease beyond these rang.（3）It is obvious between sowing dates and densities.The combination of sowing in October26 to November 15 with the density from 120,000 to 160,000/667m^2 benefits to get suitable ears,the combination of sowing in October 26 to November 15 with the density from 80,000 to 160,000/667m^2 can get a larger ear and increase grain weight,and the combination of sowing in October 26 to November 15 with the density from 120,000 to 160,000/667m^2 advantages to get a higher yield.（4）Under climate warming,the wheat suitable sowing date is from November 1to November 10 and the wheat planting density is from 120,000 to 160,000/667m^2 in southern Areas of Jiangsu.