PROBLEM TO BE SOLVED: To provide a chemical spraying work vehicle obtainable of vehicle speed even when speed information from GPS is hardly obtained due to effects of weather and a geographical feature and controllable of the chemical spray amount based on the obtained vehicle speed.SOLUTION: There is provided the chemical spraying work vehicle equipped with a GPS receiver 81 receiving position information and speed information from GPS, a vehicle speed sensor 4 detecting the rotation number of a wheel 12 or 13, and a pesticide applicator B controlling the chemical spray amount based on chemical ejecting pressure by a pest control pump 65 ejecting the chemical, and equipped with controllers 100 and 101 calculating the ejecting pressure of the pest control pump 65 from a relation between the vehicle speed and the predetermined chemical spray amount A per unit area, in which the vehicle speed is a vehicle speed VG based on the information from GPS and/or a vehicle speed Vs by the vehicle speed sensor 4 or the averaged vehicle speed of the vehicle speed VG and the vehicle speed Vs, and adjusting the opening of a chemical flow amount control valve 73 to agree with the ejection pressure calculated value so as to control the chemical spray amount A per unit area to be uniform.COPYRIGHT: (C)2012,JPO&INPIT【課題】GPSからの速度情報が気象、地形などの影響を受けて得難い場合にも車速を知ることができ、得られた車速に基づき薬液散布量が制御可能な薬液散布作業車両を提供すること。【解決手段】位置情報と速度情報をGPSから受信できるGPS受信機81と車輪12又は13の回転数を検出する車速センサ4と薬液を吐出する防除ポンプ65による薬液吐出圧力に応じて薬液散布量を調節する防除機Bを備えており、GPSからの情報に基づき車速VG及び/又は車速センサ4による車速Vs又は車速VGと車速Vsの平均化された車速と、予め設定された単位面積当たりの薬液散布量Aとの関係から防除ポンプ65の吐出圧力を計算し、該吐出圧力計算値に一致するように薬液流量調節弁73の開度の調整をして予め設定された単位面積当たりの薬液散布量Aが均一になるように制御する制御装置100,101を備えている薬液散布作業車両である。【選択図】図7
