The effects of soil loose on physiological characters and tuber yield formation of potato (Solanum tuberosum L) CVS Kexin 10 and kexin 11 were studied. The results showed that the improved soil loose increased the ATP content and improved the ATP enzyme activity in functional leaves, increased the contents of ATP and ABA in tubers and improved the ATPase activity in tubers. The improved soil loose also accelerated the transportation of 14C- photosynthates from leaves to tubers, increased the ratio of distri...