PROBLEM TO BE SOLVED: To inexpensively provide a working condition computing device for a fertilizer distributor, capable of easily computing working conditions when a fertilizer is distributed, and capable of being used for a conventional fertilizer distributor.SOLUTION: The working condition computing device 5 includes an input part for inputting a working travelling speed, a fertilizer distribution amount per unit area and a specific value of the fertilizer to be distributed. The working condition computing device 5 also includes a display part 51 which computes the opening of a shutter part of the fertilizer distributor 2 based on respective input values from the input part and displays the computed shutter opening. The working condition computing device 5 for the fertilizer distributor is configured as a separate body from the fertilizer distributor 2.【課題】肥料散布時に簡単に作業条件を算出可能であり、従来の肥料散布機にも使用可能な肥料散布装置用の作業条件算出装置を安価に提供する。【解決手段】作業条件算出装置５は、作業走行速度と単位面積当たりの肥料散布量と散布する肥料の特性値の入力部を有し、入力部よりの各入力により肥料散布装置２のシャッタ部の開口量を算出してシャッタ開度を表示する表示部５１を設けて肥料散布装置２とは別体で構成されている肥料散布装置用の作業条件算出装置５による。【選択図】 図４
