Single crops, multiple impacts The availability of chemical fertilizers plus continual improvement of strains led to an explosion in corn harvests, just in time to provide the main source of feed to the rapidly expanding operation of animal husbandry on an industrialized basis.
單一農作，眾多後遺症化肥問世，加上品種不斷翻新改良，讓玉米收成暴增，正好成為新興工業化畜牧業的最佳飼料來源。