[按]这一讲由于定稿较晚,曾将以后各讲提前发表,现于这期补登。第二讲有交互作用的试验第一节交互作用的概念在多因子试验中,一般地说,某些因子对指标的影响往往有互相制约、互相联系的现象。这时不仅各因子对指标产生作用。而且因子之间还会联合起来对指标产生作用,这个联合作用就叫做交互作用,试看下例。某生产队对土地情况大致相同的四块棉花试验地,用不同方式施用氮肥和磷肥,结果列表如下: [Press] This speech due to the late finalization, have been published in advance after each speech, is now in this period of registration. Lecture 2 Interaction Experiment Section I Concept of Interaction In multi-factor experiments, in general, the influence of some factors on indicators often has the phenomenon of mutual restriction and connection. At this moment not only each factor has an effect on the index. And the factors will also work together on the indicators, the joint effect is called interaction, try the following example. A production team on the land conditions roughly the same four cotton test sites, using different ways of nitrogen and phosphate fertilizer application, the results are as follows: