Comparison of leaf transpiration rate in Red Fuji apple measured by two methods

In order to understand the law of leaf transpiration rate in Red Fuji apple and offer a empirical correction coefficient,using porometer method and in-vitro shoots weighing method,continuous located observation of leaf transpiration rate of Red Fuji apple was carried out in Shangzhai Village(36°15′N,117°06′E),Chaoquan Town,Tai'an City,Shandong Province,during 2008 to 2009,the two methods were compared,and the correction coefficient of leaf transpiration rate of Red Fuji apple was obtained by using porometer method.The results show that value obtained by using porometer method is constantly larger(0.03-3.00 times with a mean as 1.02 times) than that obtained by using in-vitro shoots weighing method,and the correction coefficient of the whole growing phase is 0.495.Leaf transpiration rate of in-vitro shoots(supplied with sufficient water) measured by porometer method is 1.07-3.44 times(with a mean as 1.45 times) as large as the leaf transpiration rate of living tree.