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。

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Urea and ammonium nitrate are common fertilizers.

动物粪是良好的肥料。

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General Barbero has worked hard with other federal agencies to curb the availability of ammonium-nitrate fertilizers made in Pakistan, since traces of the agricultural chemical have shown up repeatedly in the aftermath of Taliban bombings.

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