摘要
用^(15)N 示踪法进行盆栽试验,研究稻草和稻根对于尿素肥效的作用.结果表明:在水稻和小麦上,稻草处理都有增加尿素^(15)N 在土壤中的生物固持作用和减少其损失的效果.分析植株上谷/草的 dff 比值,表明稻草处理提高尿素^(15)N 运转到稻谷和麦粒的相对比率.当水稻迟栽情况下,植株对肥料的依赖性增强,因而稻草和稻根处理更明显地促进植株对尿素^(15)N 的吸收量和转化率.试验得出的“激发效应”,在水稻上为正的而在小麦上为负的.
The ^(15)N tracer method was used to study the effect of rice straw and stubbles plowed under insoil on the crop response to urea in pot experiments.The results are as fallows:treatment with straw increasedthe amount of immobilized ^(15)N and thus reduced the ^(15)N loss in both rice and wheat experiments.On the ba-sis of the specific dff of the grain and straw showed the rice straw treatment was the increase in the proportionof ^(15)N transferred into rice and wheat grains.When the rice seedlings were planted later the plants'depen-dence on the fetilizer was increased.The treatments with both straws and roots increased the absorption ofurea- ^(15)N and thus the rate of recovered ^(15)N was more significant.The“priming effect”of fertilizer on soilN was positive in paddy soil while it was negative in wheat cropping.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1992年第3期45-52,共8页
Journal of Nanjing Agricultural University
关键词
稻草
稻根
尿素
肥效
^(15)N tracer method
fertilizer response
specific dff
priming effect
