晋单35等四个玉米品种光合特性的比较

比较了晋单35、恒丰1号、农大3138和晋单34的叶面积指数、光合势、净同化率、干物质积累。结果表明：在整个生育期内，四个品种的叶面积指数和光合势变化均呈现先升高而后逐渐下降的变化趋势。不同生育阶段，晋单35的叶面积指数、光合势均高于其它三个品种；四个品种净同化率变化为，先下降后升高然后又逐渐下降。平均净同化率恒丰1号最大，晋单35的最小；在整个生育期内干物质积累为，恒丰1号最多，晋单35、农大3138次之，晋单34最少。

Research on Comparison of Photosynthetic Characteristics of Four Maize Varieties such as Jindan 35 etc.

In this study, data of four maize varieties such as indexes of leaf area, photosynthetic potential，net assimilating rate and accumulation of dry matter were com pared. These four maize varieties were Jindan 35, Hengfeng 1, Nongda 3138 and JIndan 34.The results showed: in the whole breeding periods, change of indexes of leaf area, photosynthetic potential of four varieties possessed the trend that prior rose and then gradually dropped. In different breeding periods, Jindan 35's data such as indexes of leaf area, photosynthetic potential were higher than those of other three varieties; the changes of net assimilating rate of the four varieties were prior decline then rise and then gradual descending. In terms of net assimilating rate, Hengfeng 1's was highest and Jindan35 's lowest. The order of accumulation of dry matter was Hengfeng 1, then Jndan 35, Nongda 3138, the last one was Jindan 34.