PROBLEM TO BE SOLVED: To provide a fertilizer spreader designed to spread a fertilizer in amounts ranging from a small to large levels in high accuracy with shutters divergence control alone regardless of the fertilizers physical properties.SOLUTION: The fertilizer spreader includes: ports 10, 11 and 12 via which a fertilizer falls, respectively fertilizer adjustment ports 20, 21 and 22, wherein one or more thereof are opened so as to be switchable to a communicating mode or non-communicating mode for the ports 10, 11 and 12 in accordance with the turning of a shutter plate E. In the fertilizer spreader, one or more of the ports 10, 11 and 12 and/or fertilizer adjustment ports 20, 21 and 22 has such a profile that the width along the radial direction of the shutter plate E becomes larger along the turning direction of the shutter plate E.COPYRIGHT: (C)2010,JPO&INPIT【課題】肥料の物性にかかわらず、シャッタ部の開度調節のみで、微量の肥料から大量の肥料まで高精度に散布する。【解決手段】肥料が落下する肥料落下口10、11、12と、シャッタプレートEの回動に伴って肥料落下口10、11、12に対して連通状態と非連通状態とに切替わるように1個以上開口された肥料調整口20、21、22と、を備え、肥料落下口10、11、12及び/又は肥料調整口20、21、22の1個以上は、シャッタプレートEの径方向に沿う幅がシャッタプレートEの回動方向に沿って大きくなるように変化する形状である。【選択図】図3
