以中浙优1号和甬优1540为材料，采用栽培池培养试验，研究缩二脲对水稻出苗率及叶片白化特性的影响。结果表明，缩二脲含量在0～2.0%时对水稻的出苗率和秧苗生长量影响较小；缩二脲含量高于4.0%时显著降低了出苗率，显著抑制秧苗的生长，中浙优1号和甬优1540干物质量分别降低24%和17%；水稻叶片对缩二脲比较敏感，缩二脲造成叶片发白的叶位主要在第2叶，第3叶叶片发白比例较低，但是当缩二脲含量达到4.0%时，第3叶叶片发白比例也开始上升；当缩二脲含量过量时，显著降低叶绿素含量以及叶绿素a/叶绿素b比值。化肥中的缩二脲是引起直播稻出现白化苗的重要原因，在直播稻和水稻育秧中，应选用缩二脲含量较低的肥料。

In order to study on the effects of biuret on seedling rate and leaf bleaching characteristics of rice, an experiment in cultivation pool was conducted, Zhongzheyou 1 and Yongyou 1540 as materials. The results showed that the effects of biuret on rice seedling rate and seedling growth was less when biuret content in 0～2.0%． The seedling rate significantly decreased and the seedling growth significantly inhibited when biuret content more than 4.0%, the dry matter of Zhongzheyou 1 and Yongyou 1540 were reduced by 24% and 17% respectively. The leaves of rice were more sensitive to biuret and when the application of biuret more than 2.0% caused the leaves white, mainly in the second leaf. The excessive application of biuret significantly decreased the content of total chlorophyll and the ratio of chlorophyll a/chlorophyll b. Biuret is the main cause of albino seedling in direct seedling. In the production, the compound fertilizer with low biuret was recommended.