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Table 3 Optimal sampling size for FSL and FNP over different densities (100, 150, 200, 300, 400 and 600 seeds m−2) and precisions (5, 10 and 15%)

From: A method to estimate plant density and plant spacing heterogeneity: application to wheat crops

Sowing density (seeds m−2) Parameters CV = 5% CV = 10% CV = 15%
a b FSL (cm) FNP (Nb. Plt) FSL (cm) FNP (Nb. Plt) FSL (cm) FNP (Nb. Plt)
100 1.11 5.70 2478 363 620 90 250 39
150 1.15 3.01 1406 348 351 88 130 37
200 1.32 3.00 1398 308 350 78 130 33
300 1.10 2.41 1162 363 291 90 110 39
400 1.10 1.44 774 363 194 90 60 39
600 1.16 0.96 584 348 146 85 50 37
  1. This was calculated using the average values of the parameters a and b of the gamma distribution derived for each density over the 14 plots available