They put three different substances on the fields:chemical fertilize,manure from swine fed traditional corn diets and manure from swine fed low-phytate corn diets.

• 他们在那放了三种不同的物质：化肥，以传统谷物为饲料的猪的粪肥和以低植酸作物为饲料的猪的粪肥。