Nutrients from sewage and agricultural fertilizers also help algae grow .
污水和农业肥料中的营养也可以导致海藻大规模增长。
It can also seep in from some pesticides and fertilizers .
同样它们也可以通过杀虫剂和肥料渗透进食物。
But some of the vegetables were grown with chemical pesticides and organic fertilizers . Others complied with danish guidelines for organic farming .
但有的蔬菜在生长中用了化学杀虫剂和有机肥料，另一些则遵循着丹麦有机种植准则。
So food grown without conventional chemical pesticides , fertilizers and lacking additives is popular despite the fact that it costs as much as 50 percent more .
So he and his colleagues tested a range of chemicals found in fertilizers , including nitrate , ammonium and urea , to determine their effects on the algae .
