五、水平数不同的试验前一讲所谈的都是水平数相同的试验,即在试验中所要考察的各个因素都选取同样多的水平数。但是,在实际工作中,各因素的水平不可能都是“一刀切”的。比如,有时受试验条件限制,某些因素只能少选几个水平;有时在试验中有意偏重于考察某个(或某几个)因素而多取几个水平。这就提出了水平数不同的试验问题。在配合栽培条件的品种比较试验中,我们时常用到这种方法。 Fifth, the level of a different number of pre-test talk about the same number of tests are the same, that is, in the test to be investigated by the various factors are selected as many as the number of levels. However, in actual work, the level of various factors can not all be “one size fits all”. For example, sometimes limited by the test conditions, some factors can only be less than a few selected levels; sometimes deliberately in the trial emphasis on one (or several) factors to take a few more. This raises the question of different levels of test. In the cultivation of varieties with the comparative test, we often use this method.