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在鲁伊斯安那州(Louisiana)的条件下栽培红苕的田间技术变化较大而且往往是主观的。变异系数的范围为5—50％。(L. A. Jones和T. P. Hernandez的未公布的资料)在红苕的田间技术工作中,需要降低试验误差。汤姆生(Thompson)发现红苕试验采用方形小区优于长而窄的小区,除非长而窄的小区安排为多行区,而且作出了以下的结论,即长约27.4公尺的小区,重复4或5次,对田间试验将是适合的。如果27.4公尺长的单行区被分成若干短行,可以指望小
Field techniques for cultivating red cress under the conditions of Louisiana vary widely and are often subjective. The coefficient of variation ranges from 5 to 50%. (Unpublished data by L. A. Jones and T. P. Hernandez) There is a need to reduce the experimental error in the field work on red tide. Thompson found that the red tide test used a square cell superior to a long, narrow cell unless the long, narrow cell was arranged in a multi-row region and concluded that a cell of about 27.4 meters in length, repeat 4 or 5 times, will be suitable for field trials. If the 27.4-meter long one-way street is divided into several short lines, one can count on small ones