用系统工程的观点和方法研究农业科学试验是一引人注目的问题,特别对加速我国农业现代化进程,这一问题更有现实意义。系统科学研究所简济斌在“关于正交选优法的一些观点”中提出了联合正交试验方案,本文是利用这一思想,安排了防治干热风的联合试验方案,并给出了联合正交试验的统计分析方法。干热风一般发生在五月中旬到六月上旬,是一种危害小麦的灾害性气象因子。从山 It is a conspicuous issue to study agro-science experiments from the perspectives and methods of systems engineering, especially for accelerating the process of agricultural modernization in our country. In his article “Some Opinions on Orthogonal Optimization Method”, Jian-Bin Institute of Systems Science put forward a joint orthogonal experimental scheme. This article is to use this idea to arrange a joint experimental scheme for preventing and curing dry-hot wind, and give the joint orthogonal Test statistical analysis. Dry hot air usually occurs in mid-May to early June, is a disastrous meteorological factor that endangers wheat. From the mountain