During the Green Revolution, leftover nitrogen from WWII was put on the soil as a fertilizer to increase yields. This produced plants with gigantic heads of wheat that were so heavy they fell over into the soil and made harvesting difficult. To solve this issue, wheat was crossed with a dwarf Japanese goat grass. This hybridization resulted in a plant with a very short, stocky stalk that could support the abnormally large and heavy heads of wheat. Wheat went from over 6 feet tall to a mere 2 feet tall. The long waving wheat fields were no longer a sight to see. This new hybridized wheat lacked a good leaf canopy which  necessitated the use of more chemical herbicides and insecticides. Crops no longer are rotated which depletes soil nutrients. Modern wheat cannot be grown without man and It does not regrow from its own seed, but needs to be replanted each year.