应用^(15)N研究金丝小枣的吸氮规律  

Application of ^(15)N Isotope in the Research of Jujube Tree N Uptake Behavior

作　　者：武之新[1] 

机构地区：[1]河北省沧州市农林科学院,061001

出　　处：《中国农业大学学报》1997年第S2期124-127,共4页Journal of China Agricultural University

摘　　要：在微区条件下,通过春、夏、秋三个季节对金丝小枣施用^(15)N 标记的尿素,研究发现夏施时枣树能利用25%左右的肥料氮,且吸收速度很快,有利于当年果实的高产。秋施时 N 的利用率只有12%,近一半仍保留在土壤中,而春施约72%的 N 损失掉。春秋枣树的吸氮速度都较低,此时施用氮肥必然导致利用率低,经济效益也低。夏季是金丝小枣的最佳施氮时期。^(15)N-labeled urea was applied in spring,summer and autumn on jujube tree.It was found that about 25% of urea applied in summer time was uptaken by jujube tree.On- ly 12% urea used in autumn was in the plant,half remained in soil.More than 72% of N left in soil when urea was utilized in spring.Application of N in summer was benefit to ju- jube tree growth and resulted in high yield that year.

关 键 词：金丝小枣 ¹⁵N 示踪 吸氮规律 

分 类 号：S665.1[农业科学—果树学]