田间系统观测表明，春大麦不同叶位叶片的最高光合速率、平均光合速率、光合持续时间和叶面积大小均有差别，基部叶片的较低。单株总叶面积和单株总光合速率在生育期间均呈单峰曲线，挑旗－抽穗期最高。单株平均光合速率在生育期间变化相对平稳，挑旗－－抽穗期相对高些。单株总光合速率、单株日增重与单株叶面积关系较大。单株干重与单株总光合速率相关性较大。产量与经济系数有很大关系。 Field observations showed that the maximum photosynthetic rate, average photosynthetic rate, photosynthetic duration and leaf area of ​​different leaf positions of spring barley were different, while the base leaves were lower. The total leaf area per plant and the total photosynthetic rate of single plant during the growth period showed a single peak curve, flag - heading the highest. The average photosynthetic rate of single plant during the growth period was relatively stable, and the flag-flagging stage was relatively higher. Total photosynthetic rate of plant, plant daily gain and leaf area of ​​a larger relationship. The dry weight per plant and the total photosynthesis rate of a large correlation. Production and economic factors have a great relationship.