晚播的小麦和适时播种的小麦相比,其生长发育有以下几个不同点:一是播期推迟,出苗缓慢,叶片少,单株叶面积小,光合时间短,积累营养物质少。二是分蘖晚,分蘖少,成穗率低。三是次生根短且少,吸肥能力差。四是幼穗分化和籽粒灌浆开始晚,时间短。 根据晚播小麦的生长发育规律,必须因势利导,采用相应的栽培技术措施。实践证明,晚播小麦只要品种对路,科学管理,仍可获得好的收成。 Sowing late wheat and timely sowing wheat compared to its growth and development have the following differences: First, delayed sowing, emergence is slow, less leaves, leaf area per plant, photosynthetic time is short, the accumulation of nutrients less. Second, tillering late, less tillers, into a lower ear rate. Third, secondary root short and less fat absorption ability. Fourth, panicle differentiation and grain filling began late, a short time. According to the law of growth and development of late-sown wheat, we must make the best use of appropriate cultivation techniques and measures. Practice has proved that as long as the late broadcast of wheat varieties, scientific management, can still get a good harvest.