PROBLEM TO BE SOLVED: To provide a seedling planter which can plant seedlings, in a state where the amount of the seedlings is as uniform as possible, even if slippage of the seedlings is caused on the longitudinal conveyance of the mat-like seedlings, and which can avoid minimization of the planted seedlings, even if the slippage of the seedlings is abnormal.SOLUTION: This seedling planter includes driving-changing mechanisms 80 for changing the driving quantities of longitudinally conveying conveyers for longitudinally conveying mat-like seedlings on a seedling tray, seedling slippage detection means 101 for detecting the longitudinal slippage quantities of the mat-like seedlings in a state that the longitudinally conveying conveyers are stopped, and further a control means 95 for controlling and operating the driving-changing mechanisms 80. The control means 95 can be freely switched into a correction control mode for setting corrected control target longitudinal conveying quantities obtained by correcting set control target conveying quantities by a longitudinal conveying quantity-setting means 96 on the basis of detected slippage quantities by the seedling slippage detection means 101, and controlling and operating the driving-changing mechanisms 80 so that the mat-like seedlings are longitudinally conveyed in the set corrected control target longitudinal conveying quantities, or a non-correction control mode for controlling and operating the driving-changing mechanisms 80 so that the mat-like seedlings are longitudinally conveyed in the set corrected control target longitudinal conveying quantities, without setting the set corrected control target longitudinal conveying quantities.COPYRIGHT: (C)2009,JPO&INPIT【課題】 マット状苗の横送り時におけるずれ動きが発生しても、苗の使用量を極力均一にした状態で苗植付けをすることができ、苗のずれ動きが異常であっても、植付け苗の極小化を回避することができる苗植付け装置を提供する。【解決手段】 苗載せ台のマット状苗を縦送りする縦送り搬送体の駆動量を変更する駆動変更機構80と、縦送り搬送体が停止された状態でのマット状苗の縦移動量を検出する苗ずれ量検出手段101と、駆動変更機構80を調整操作する制御手段95とを備えてある。制御手段95は、縦送り量設定手段96による設定制御目標縦
