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晴天，田间水稻顶部完全展开叶最大的Ｐｎ出现在上午８时半左右。低钾营养加剧了“午睡”。８：３０～１４：３０高光强期间Ｐｎ与气孔导度和Ｃｉ分别呈显著直线正相关。Ｈｉｌｌ反应活力午后最低，但该时低钾水稻的Ｈｉｌｌ反应活力较钾充足水稻高。ＳＯＤ活力早晨最低，中午该酶活力增加程度在低钾水稻中更为明显。上述各项均存在着品种间的差异。因此，低钾下水稻“午睡”的加剧由低气孔导度所致，较长时间的低Ｃｉ会诱发低的Ｈｉｌｌ反应活力。
On sunny days, the largest Pn of the rice leaves on the top of the rice field in the field appeared at about 8.30 a.m. Hypokalemia aggravates “nap.” There was a significant linear positive correlation between Pn and stomatal conductance and Ci at 8:30 ~ 14:30 during high light intensity. Hill reactive vitality lowest in the afternoon, but at this time low-potassium rice Hill reaction activity than potassium sufficient rice. SOD activity in the morning minimum, noon increase in the degree of enzyme activity in low-potassium rice is more obvious. All the above are the differences between varieties. Therefore, the hypnosis of low-K under rice was aggravated by the low stomatal conductance, and the lower Ci of low K would induce low Hill reaction activity.