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田间试验准备过程中,在试验设计上可能存在两个问题,即:是增加重复次数还是扩大小区面积?根据过去的经验,通常是在固定小区面积的基础上增加重复次数.但从大量的文献资料看,对于某种特殊作物或特殊地区有其适宜的小区面积.然而,Pearce(1955)指出,这些资料有时可能使人误入岐途,因为适当的小区面积应决定于当地的土壤条件.Smith(1938)曾提出过估算任一田间土壤异质性指标(b)的经验法则,用以预测田间小区面积的变异.虽然这一法则缺乏理论依据,却从未引起争议(Pearce,1976).应用这一法则所需的田间指标b,通常是未知的,必须通过
In the field trial preparation, there may be two problems in the experimental design: whether to increase the number of repetitions or to enlarge the area of a cell? Based on past experience, it is common to increase the number of repetitions on the basis of a fixed cell area. However, However, Pearce (1955) pointed out that such information can sometimes be misleading as the appropriate plot size should depend on the local soil conditions. Smith (1938) proposed a rule of thumb for estimating soil heterogeneity in any field (b) to predict variations in the area of a field plot that has not been controversial, even though it lacks theoretical evidence (Pearce 1976) The field indicators required for the application of this law, b, are usually unknown and must be adopted