Aiming at the questions such as excess N application,low N utilization rate at the season in the process of rice production,Decision Support System of precise N application in rice in Jiangyan city based on PDA was developed primarily.

This paper discusses the concept and the necessity of the site-specific fertilization on the (background) of precision agriculture and on the basis of analyzing the relationships of soil, crop and crop (nutrition).

Application progress of remote sensing in precision fertilization management;

Based on the technology of computer and the wireless data transmission,the rapid measurement system that integrates GPS,GIS and the quick analysis equipment of soil nutrient and moisture was developed in order to meet the needs of highly-densed and overall farmland soil information collection,the wireless data communication and fertilization decision in the precision fertilization.

Research on the Key Technique of Precision Spraying and Truck-Mounted Spraying Machine;

The research mainly concludes several aspects as follows:1) The design of intelligent weed platform for precise spraying:design the intelligent weed equipment based on the environment of filed.