土壤科学家Sharon B Hornick发现施给植物过量的氮肥,会使蔬菜叶内维生素C含量减少。该问题是在研究有机肥和无机肥对食物营养价值影响过程中发现的。 Hornick把瑞士的牛皮菜和青豆栽种于花房内,给一部分植株施以氮、磷、钾比例为3:1:1的 Sharon B Hornick, a soil scientist, found that applying too much nitrogen fertilizer to plants would reduce the amount of vitamin C in the vegetable leaves. The problem is found in the study of the impact of organic and inorganic fertilizers on the nutritional value of food. Hornick planted Switzerland’s cabbage and green beans in a greenhouse and applied nitrogen, phosphorus and potassium to some plants at a 3: 1: 1 ratio