ABSTRACT
Nonetheless,muchofthelandinthatareahasbeen incropsfor100yearsormore,indeedsomeofit sincecolonialtimes.WestoftheeasternGreatPlainsexceptforpartsofthePacificNorthwest-moisture, notsoils,istheprincipalfactorlimitingcropproduction.However,whenirrigated,muchofthatland isasproductiveasanyinthecountry.
