Shahab Sarfarazi - Expert of Agronomy in Agri-Gahad Management- Darab
Sohrab Ashoori - Expert of weeds in Agri-Gahad Management- Darab

Drought phenomenon is one of hydrological and Climatology phenomenal in world.Drought stress although is contiguous and stable period. Descending from heaven is very low in this period and temperature, evaporation and transpiration are height. Also water amount in water sources decrease too much. Each crops need to sufficient water for reproductive and vegetative growth. There for decrease of water and drought stress caused to decreased growth and yield in plants. There effects deliberated in sociality humanistic and political sciences. Recent estimates showed that world population will be9 milliard in A.D.2050. Earth temperature will be height between 1 to 2 C. Drought stress effects on crops deferent's don’t similar to. They showed deferent reaction to drought stress too. For example Drought stress decreased seed number in wheat and rice. Also pollination Different factors effective on aggravation of water exterior in world. Therefore they are very important and they should be studies.

water crisis, Agriculture, Drought