缩二脲对水稻出苗率及秧苗白化的影响

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。

Effects of Biuret on Seedling Rate and Albino Seedling of Rice

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.