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Agricultural researchers have engineered several —varietiesvarietyvariationvarying of wheat that can survive extended dry spells by conserving soil moisture. These strains are typically —distributeddistributingdistributedistribution to farmers in regions where rainfall has become increasingly unpredictable. Field trials suggest that yields remain —stablestabilitystabilizestabilizing even when irrigation is reduced by half, making the crops especially valuable in areas already —pronepronenessprone to beingpronely to prolonged water shortages.