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.
他和同事们研究了肥料中的一系列化学物质，包括硝酸盐，铵和尿素，观察他们对海藻的影响。
Urea and ammonium nitrate are common fertilizers.
动物粪是良好的肥料。
Urea and ammonium nitrate are common fertilizers.
动物粪是良好的肥料。
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