摘要
根外施钾对金矮生苹果幼树气孔及光合特性影响的研究表明 ,根外施钾在全天的绝大部分时间里均可增大气孔开张度 ,一天中可使气孔开张度提早达到最大值 ,且午后气孔开张得到较快恢复。根外施钾虽不改变光合速率日变化的总规律 ,但可提早进入光合作用的最高峰 ,且午后恢复较快 ,在一定程度上缓和了“午休”现象。不同时期根外施钾均可提高叶片光合速率。在整个生长季节中 ,根外施钾以 5次较为合理。
Effect of K spray on stomatal conductance were showed,the stomatal conductance increased almost all times in day ,the peak of stomatal conductance emerge earlier and it return its back very fast also.There was no influnce on the photosynthetic rate,but in a day it makes the peak of photosynthetic rate emerge earlier.K spray will improve photosynthetic rate in different period.In all growth period,spring five times are very effect.The photosynthetic rate is positively correlated to the stomatal conductance.
出处
《山西农业科学》
2002年第1期57-60,共4页
Journal of Shanxi Agricultural Sciences
