种植者通常认为,给植物施肥多多益善。由于化肥成本小,许多种植者往往大量加以使用。科学家最近的研究表明,氮肥过量可导致蔬菜植物维生素C的减少。美国农业部农业研究所的研究人员霍尼克对牛皮菜、青豆和羽衣甘蓝进行了试验,结果发现,这三种绿色植物在施用过量氮肥之后维生素C量都减少了。例 Growers usually think that fertilizing plants is much better. Due to the low cost of fertilizers, many growers often use it in large quantities. Recent studies by scientists have shown that excess nitrogen can lead to a reduction of vitamin C in vegetable plants. Hornick, a researcher at the U.S. Department of Agriculture’s Institute of Agriculture, tested Bees and Green Beans and kale and found that vitamin C levels were reduced in all three green plants after they were given excess nitrogen fertilizer. example