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在农田灌排试验中,要比较几种不同处理时,首先要考虑的一个间题是如何获得比较均匀的区组。然而,农田内部各点的土壤肥力、土壤性状、水文地质条件以及小气候条件等是不相同的。包括常用的正交设计法在内的许多方法都无法解决这一实际问题,只有平衡不全完区组(BiB)设计法,把要比较的几种不同的处理,分成若干个组(即区组),只要求组内处理的试验条件基本相同,而允许区组与区组间的较大差异,可以获得合理
In the field of irrigation and drainage test, to compare several different treatments, the first question to consider is how to get a more uniform block. However, soil fertility at various points within the farmland, soil properties, hydrogeological conditions and microclimate conditions are not the same. Many practical methods, including common orthogonal design methods, can not solve this practical problem. Only the design method of the balanced incomplete set (BiB) divides several different processes to be compared into several groups ), As long as the experimental conditions for treatment within the group are basically the same, but allow large differences between block groups and block groups, it is possible to obtain reasonable