对比试验是我们目前在农村中进行示范,搜集资料的主要方式。在产量差异不大,或其他性状用目力虽以辨别的情况下,如果单纯依靠一个对比的结果来说明问题是欠妥当的,因为土壤差异或其他因素都可能影响所得的结果。为了较正确的掌握科学资料,在田间试验中必须有重复,以便求得平均数字,同时比较各重复间差异的趋向。但是在农村中一块地上作很多重复是有困难的。建议采用以下两个方法:(一)在对照与试验的两区中各按行,行组或划等面积的几个小区分别收获秤重。如图示 Comparative tests are the main ways we currently demonstrate and collect information in rural areas. In the case of small differences in output or inability to discern other traits, it is inappropriate to rely solely on a comparative result to explain the problem because soil differences or other factors can affect the results obtained. In order to get a better grasp of scientific information, there must be duplication in the field trials in order to find the average and to compare trends in the differences between the repetitions. However, it is difficult to make a lot of repetitions on the ground in a rural area. The following two methods are suggested: (1) Weighing is carried out separately in each of the two districts of the control and test by rows, rows or districts. As shown