WORK VEHICLE

PROBLEM TO BE SOLVED: To perform the estimate operation of the residual days of ammonia nitrogen (days required in the change to nitrate nitrogen) from the measuring results of the content of ammonia nitrogen in soil of a field or the like to analyze a deficient soil component on the basis of the measuring results and the operation results and to apply fertilizer containing the deficient soil component to soil. SOLUTION: In this work vehicle 100 loaded with a diffused reflection measuring instrument 22 for measuring the amount of an effective component in soil by irradiating soil with infrared rays and subjecting collected diffused reflected light to spectral analysis, a data base selected to the reduction degree of ammonia nitrogen with the elapse of time corresponding to the applying amount of nitrogen fertilizer per a unit area of the field is provided and the soil component deficient in the field is calculated at every measuring region on the basis of the data base 10 and the measuring results of the ammonia nitrogen component to be displayed. COPYRIGHT: (C)2008,JPO&INPIT