一、前言在1977年初,结合从1972年开始的育种工作,对60多个小麦品种的生育、形态等特征以及北京地区的有关生态条件进行调查分析的基础上,我们发表了北京地区冬麦育种的三类“模式”。十年来,按照其中<中间型>模式,选育适于中上等以上肥力水平种植,能稳产约800斤/亩以上品种的工作,现已初步得到丰产性和稳产性都表现较为突出的“京双14号”(原名“双79鉴59”)。分析、总结它的特点,不仅能证实原有“模式”设想符合实际,而且更进一步加深了对这类“模式”的认识。二、对中间型模式的初步认识 I. INTRODUCTION At the beginning of 1977, based on the breeding work since 1972, based on the survey of the characteristics of fertility and morphology of more than 60 wheat varieties and the relevant ecological conditions in Beijing, we published the winter wheat breeding in Beijing The three types of “mode.” In the past ten years, according to the model of “middle type”, the work of breeding more than middle-superior fertility level and stable yield of more than 800 kg / mu of varieties has now obtained the initial prominence of high yield and stable yield. Beijing double 14 “(formerly known as” double 79 Kam 59 “). Analyzing and summarizing its characteristics not only proves that the original ”model“ concept is realistic, but also deepens the understanding of such ”models." Second, a preliminary understanding of the intermediate model