一、引言我国从五十年代初就开始对小麦合理密植进行研究。随着生产的发展,利用分蘖成穗的合理指标,都在不断的进行探讨。从单株穗部性状来看,主茎穗具有优势现象,因而有人提出了培育单杆大穗的设想;也有试验报道,单株成穗数的多少与穗部性状呈正相关,从而提出了精量播种栽培理论。在北京地区目前生产条件下,应采纳何种方案呢?冬小麦的产量性状与单株成穗数的相关性到底如何?大面积生产上利用多少分蘖成穗、种植多少基本苗为最佳?尤其对这次品种更新中的一些品种的研究报道甚少。我们在1981-1984年度做了这方面的工作。总结如下,以供参考。 I. INTRODUCTION Since the early 1950s, China began to study the rational and close planting of wheat. With the development of production, the rational use of tillers to spike, are constantly being explored. From the panicle character traits, the main stem spike has the advantage of the phenomenon, so some people put forward the idea of ​​cultivating a single big spike; also reported in the experiment, the number of single plant spikes and ear traits was positively correlated, thus proposed the fine Quantity sowing cultivation theory. In the current production conditions in Beijing, which program should be adopted? The correlation between the yield traits of winter wheat and the number of spike per plant in the end? How many tillering spikes to be used in large-scale production, and how many basic seedlings should be planted? Especially There are few reports on some species in this breed update. We did this work in 1981-1984. To summarize below, for reference.