Table 2 Test factor code. The experimental plan was generated using the Box-Behnken method in Design-Expert software. Following the generated plan, 27 simulation runs were carried out with plug seedling integrity ratio as the response; the design included fifteen center-point replicates to provide an effective estimate of experimental error. This arrangement also facilitates subsequent analysis and data handling; the full experimental scheme and results are presented in Table 3.

From: Design and experiment of an automatic seedling pick-up device for strawberry transplanter