Recently, various IT technologies are utilized to support crop growth management. In farming field, dynamic data analysis while moving is cost efficient tool to farmer. Unlike previous works that not support dynamic analysis, mobile devices need to acquire the most recent data from nearest sensor for efficient processing in mobile device. In this paper, we designed the dynamic crop field analysis methods using mobile sensor node. Using the mobile sensor node, field analysis such as trend, correlation and summary has become more efficient by using dynamic data search and comparing. We implement mobile sensor node and dynamic field analysis application on Win Mobile 6 PDA and evaluated the usefulness in large scale outdoor test-bed of a vineyard in Napa valley.