<正>将智能决策支持系统与农药精确对靶喷雾技术有机结合起来，研究并集成了农药精确喷雾智能决策支持系统，为实现农药精确喷霉提供智能决策。在对系统目标、系统功能、系统结构分析的基础上，通过ID3算法对农药喷洒进行归纳。构建了PPSIDSS喷雾决策树。

A five years old provenances testing of Platanus occidentalis L. results was reported in this article, which was planted in Songjiang area of Shanghai, China. Based on the five years performance, the superior families and individual trees were selected according to the data at the end of 2004. The results were shown that 12 families among the provenances were grown faster over the family mean about 6.50%, 12.31%, and 28.54% in height, breast diameter and volume respectively. Sixteen selected individuals among the standing families were 18.05 %, 38.79%, 100.55% over family mean, which the fastest growing individuals increased 44.07%, 62.91%, and 224.92% respectively. Combinating of the selection of superior families and individual tree selection, the author found that the distribution of the families fitting Songjiang area trend toward the more northern latitude and more eastern longitude of midsouth the United States of America.