Drought is a deplorable event that has great impact on human, communities, plantations, and ecology. The destructive effects resulting from drought appear gradually with the result of decreased agricultural crops, food as well as economics, social, and environmental ramifications.
This study aims at quantify drought and achieving a rational policy, using a normal Z index in Bushehr province. since, the accurate investigation of drought impacts on agricultural crops and finagling the preventive strategies accordingly may reduce the economic ,social, and environmental pressure Using normal Z index, this study analysis annual, seasonal, and monthly precipitation data in stations based in Bushehr province during statistical period 1973-2000. Consequently, the general characteristics of drought including frequency, intensity and continuation period will be obtained. The findings show that there is a a high probability of annual, seasonal, and monthly drought in different regions of the province. The most frequent type of drought is moderate drought (in Bushehr and Borazjan station) and the intense drought (Kaki and Kangan stations). one-year drought period is the most frequent period of drought the drought in winter is the worst drought and jun has the worst drought. To investigate the impacts of drought on wheat crops,77-78. 78-79(Persian year ) were selected due to available on crops in than year.