在当代作物栽培中,高产依然是人们努力的目标。决定产量的因素是叶面积的合理发展和群体光合生产能力的提高,尤其是提高抽穗至成熟期的净光合产量。通过栽培措施提高适宜的叶面积指数和合理的动态变化,一直是人们所关注的。另一方面,谷物产量的最终表现是每亩总结实粒数和粒重,也就是产量总库容量的大小决定了产量的高低;群体叶面积的增加能促 In contemporary crop cultivation, high yield is still the goal of people’s efforts. The factors that determine the yield are the reasonable development of leaf area and the improvement of photosynthetic capacity of population, especially the increase of net photosynthesis yield from heading to maturity. It has always been a concern that increasing suitable leaf area index and reasonable dynamic change through cultivation measures. On the other hand, the final performance of cereal production is the total number of grains and grain weight per acre, that is, the size of the total output of the production determines the level of output; the increase of leaf area can promote