“我再生利用那些被早期加州农民破坏浪费的山坡上的土地,我坚信土壤是我们坚不可摧的财产。通过收集畜禽粪便产生的绿肥、氮肥等有机肥料覆盖作物,轮换翻耕土地,以及排水灌溉系统……这些中国4000千年来的实践成果为我所用。”(杰克·伦敦写于1915年) “I recycle the land on the slopes that were wasted and wrecked by early California farmers, and I firmly believe that the soil is our unbreakable property: organic fertilizers such as green manures and nitrogen fertilizers that cover livestock and poultry manure cover the crops, rotate plowed land, and drain water Irrigation system ... These 4000 years of China’s practical results for my use. ”" (Jack London wrote in 1915)