贵州高原夏秋麦与冬播麦生育特性的比较

研究结果表明，由于高温对小麦春性品种生育的促进作用，夏秋麦比冬播麦分蘖少，秆矮叶面积小，干物质积累少，生育期短，产量低。单位面积穗数不足是夏秋麦高产的主要限制因子。多数年份夏秋麦穗粒数和千粒重比冬播麦低，气候生态因素是决定二者大小的主要环境因子。

A Comparison of Growth and Development Characters of Wheat Sown in Latesummer and Early Autumn with Those Sown in Winter in Guizhou Plateau

The experiment conducted showed that, because of the acceleration of higher temperature to growth and development of spring wheat cultivars, the vegetative growth of late summer and early autumn sowing wheat finished rapidly. They produced fewer tillers and smaller leaf area, accumulated less dry matter and had shorter period of duration and lower grain yield as compared with winter sowing wheat . The number of spikes per mu was found to be the main limiting factor to high grain yield of late summer and early autumn sowing wheat. In most of the years, the number of grains and 1000 grain weigh of late summer and early autumn sowing wheat were less than those of winter sowing wheat. Eco climatic conditions were considered as the main factors determining both of the traits.