Abstract: [Objective] The purpose of this study is to determine the effects of potassium application and foliar application of gibberellin on grain filling and yield of spring wheat.[Method]The wheat variety Xinchun-31 was selected and applied with potassium fertilizer at jointing stage, and gibberellin was sprayed at the flowering stage to study its effect on grain dry matter accumulation, yield composition and yield.[Result]The results showed that the grain filling process of wheat presented the "S" curve trend.The dry matter accumulation of the seeds showed that K180> K360> K0.And they both reached its maximum 30 days after its anthesis.Under the same level of potassium fertilizer application, with the increase of gibberellin concentration, theoretical maximum grain weight, average grain filling rate, maximum grain filling rate and grain yield increased, and reached its maximum at GA4 level.With the increase of the potassium fertilizer application, the yield of the wheat increased significantly, which presented K180> K360> K0, and reached its highest at K180.[Conclusion]In the combination of 180 kg/hm2 of potassium fertilizer and foliar spraying gibberellin concentration of about 24 g/hm2, it was most beneficial to the efficient production of Wheat.

摘要： [目的]明确钾肥用量和叶面喷施赤霉素对春小麦籽粒灌浆及产量的影响.[方法]选用新春31号小麦品种,于拔节期追施钾肥,开花期叶面喷施赤霉素,研究其对籽粒干物质积累、产量构成及产量的影响.[结果]小麦灌浆过程呈"S"型曲线变化.其中籽粒干物质积累表现为K180>K360>K0,且均在花后30 d达到最大值;在同一施钾水平下,随着喷施赤霉素浓度的增大,籽粒最高理论粒重、平均灌浆速率、最大灌浆速率和产量均增大,并在GA4水平下达到最大值.随着钾肥用量的增加,小麦产量显著增加,表现为K180>K360>K0,且于K180时达到最大.[结论]在施钾量180 kg/hm2、叶面喷施赤霉素浓度24 g/hm2的组合下,最有利于小麦的高效生产.