In a sense, the increasing costs of two scarce resources (water and natural gas) are motivating necessary adjustments in water use. Guerrero et al., ( Part of the reduction is due to changes in crop choices (2.3%), and leaving land fallow (4.1%), while part is due also to smaller applications of irrigation water (11.4%). Much of the increase has been motivated by increasing demand for agricultural products in Georgia and by the increasing use of center pivot irrigation systems, beginning in the late 1970s.