The process of flower bud differentiation of radish was observed and carbon-nitrogen ratio in leaf and growing point of the radish were tested,after 5℃vernalization treatment of radish seeds.The results showed that the morphological characteristics of shoot-tip growth cone changed,the description of 0~5grades.This could supply parameter for the research of physiological-biochemical changes during the radish flower bud differentiation process.The carbon-nitrogen ratio in growing point reached the maximum at ...