| 应用~(15)N研究金丝小枣的吸氮规律 |
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| 引用本文： | 武之新.应用~(15)N研究金丝小枣的吸氮规律[J].中国农业大学学报,1997(Z2). |
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| 作者姓名： | 武之新 |
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| 作者单位： | 河北省沧州市农林科学院; |
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| 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。
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| 关 键 词： | 金丝小枣 ~(15)N 示踪 吸氮规律 |
Application of ~(15)N Isotope in the Research of Jujube Tree N Uptake Behavior |
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| Wu Zhixin.Application of ~(15)N Isotope in the Research of Jujube Tree N Uptake Behavior[J].Journal of China Agricultural University,1997(Z2). |
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| Authors: | Wu Zhixin |
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| Institution: | Wu Zhixin (Agricultural Academy of Chuanzhou,Hebei,China) |
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| Abstract: | ~(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. |
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| Keywords: | jujube tree ~(15)N N uptake |
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