田间试验上,如果是栽培试验,经常要有几个处理相互进行比较;品种试验时,也是有几个品种相互进行比较。在几个处理或品种比较时,要用方差分析法,而测验这种多个处理或品种平均数的差异时,要用F测验。前面已经讲到,方差是标准差的平方值,也是测定变数变异程度的。我们进行的试验,各小区间一定会有些变异。发生的变异有两类,一类是由于某些特定原因引起的变异,例如品种试验上不同品种的遗传差异引起的产量和其他经济性状的差异;施肥试验上由于施肥量或肥料种类不 Field trials, if it is a cultivation test, often have to deal with each other to compare; variety trials, there are several varieties to compare with each other. In several treatment or variety comparison, the use of analysis of variance, and to test the difference between the average number of multiple treatments or breeds, use the F test. As already mentioned, the variance is the square of the standard deviation and the degree of variation of the variable. The tests we conducted, there will be some variation between the small area. There are two types of variation, one is due to some specific causes of variation, such as varieties of different varieties of genetic differences caused by the yield and other economic traits differences; fertilization test due to the amount of fertilizer or type of fertilizer is not