The accumulative moisture stress of potato crop was detected using Field Spectroradiometer data. Different degree of stress was created by manipulating the amount and interval between two consecutive irrigations. The daily soil moisture was simulated using Hydrus-1D and validated (r = 0.805 and RMSE = 0.015). The ambient soil moisture <65 % of available soil moisture was considered as moisture stress which was further integrated over period to estimate the accumulative moisture stress. The accumulated stress was regressed with several linear moisture indices and band-depth-maxima at both weak (914–1095 and 1091–1303 nm) and strong (1250–1674 and 1851–2301 nm) water absorption regions. Although there was high correlation between stress and band-depth-maxima (r > 0.9), at higher level of accumulative stress beyond 5.0, the values get saturated except for 1091–1303 nm. Hence, the band-depth-maxima at 1091–1303 nm is sensitive to wider range of stress and may be used for targeted irrigation technique to maintain safe irrigation zone.