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本文在田间种植条件下，比较了需水特性不同的两个冬小麦品种河农８５９ 和河农３２６ 以叶片光合速率为主的光合性能。结果表明，叶片的光合速率一般以河农８５９ 较高，但在刚灌水后的短时间内却以河农３２６ 的光合速率较高；河农８５９ 叶片光合速率受灌水的影响较小，在生育期间的变化较平稳，而河农３２６ 灌水与不灌水的处理间光合速率差别较大，且光合速率波动明显。结合产量性状分析，开花后灌一次水和不灌水的限水条件下以河农８５９ 产量较高，表明其耐旱性较强，而开花后保证充分供水的湿润处理则以河农３２６ 产量较高，且增产幅度较大。因此，河农８５９ 适宜于在供水有限的条件下发挥其耐旱特性，争取较高产量；而河农３２６可用于在供水充足条件下发挥高产潜力。
In this paper, the photosynthetic characteristics of two winter wheat cultivars Henong 859 and HeNong 326 with different water requirements were compared under field planting conditions. The results showed that the photosynthetic rate of leaves was generally higher in HeNan859, but the photosynthetic rate of HeNong326 was higher in the short time just after irrigation. The photosynthetic rate of HeNan859 was less affected by irrigation, The changes during the period were relatively stable, but the differences of photosynthetic rate between HeNong326 irrigation and non-irrigation treatments differed greatly and the photosynthetic rate fluctuated obviously. According to the analysis of yield traits, the yield of HeNong859 was higher under the condition of water-once and no-irrigation after flowering, which indicated that the drought-tolerant was strong and the wet treatment after flowering ensured adequate water supply compared with the yield of HeNong326 High, and a larger yield increase. As a result, HeNan 859 is suitable for exerting its drought tolerant characteristics under limited water supply conditions and striving for higher yields; while HeNan 326 can be used to exert its high yield potential under sufficient water supply conditions.