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区组划分是提高试验精确性的一个因素.区组内最佳小区大小和小区数之间存在着一定关系,区组因素不能忽略不计.H.F.史密斯考虑了区组划分因素,提出了矫正公式,直观地表达了区组内小区间的相关性.史密斯在调查小区大小变化的作用时,计算了每小区在整个试验区中的方差,发现小区单位面积产量的方差V_x与小区大小x有关,可用下式表示:logVx=logV_1-blog~x(A)式中,V_1——标准单位小区上的方差;b(0≤b≤1)——两小区间的近似值;当相
Block grouping is a factor to improve the test accuracy. There is a certain relationship between the best cell size and the number of cells in the block, and the block factors can not be neglected.HF Smith considered the block division factors, proposed the correction formula, Intuitively expresses the interdependencies among the blocks.When investigating the effect of cell size changes, Smith calculated the variance of each cell in the entire experimental area and found that the variance V_x of cell yield per unit area is related to the cell size x and is available The following formula: logVx = logV_1-blog ~ x (A) Where, V_1 - standard unit cell variance; b (0 ≤ b ≤ 1) - an approximation between two small cells;