本文中作者对研发的一种保水缓释包膜尿素肥料的包膜物理化学特征，养分缓释机制进行了研究。
A study was conducted on the physical and chemical characteristics of coatings and mechanism of nutrient slow release of water-absorbent coated urea (WACU).
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。
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.
尿素很少用于农业肥料，但是常常用作花肥。
Urea isn't commonly found in agricultural fertilizers, but it is present in many garden products.
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