| Preliminary study on responses of pear jujube saplings growth to nitrogen fertilizer |
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| DOI：10.7606/j.issn.1000-7601.2011.06.26 |
| Key Words: pear jujube saplings shoot root nitrogen fertilizer soil nitrogen soil ammonia volatilization |
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| Abstract: |
| The growth condition of shoot and root， the content of soil available nitrogen and the rate of ammonia
volatilization of potted pear jujube saplings on the cases of no N fertilizer, no N fertilizer around roots and N ferilized uniformly were investigated to explore the responses of the potted pear jujube tree saplings growth to nitrogen fertilizer and the reasons. The results showed that the shoot and root number and the fresh weight of jujube tree saplings on the case of no N fertilizer was significantly greater than the other two treatments，and the growth was in a good condition; The jujube saplings on the case of no N fertilizer around roots were growing well in the early stage of planting， but the growth became slowly and even appeared dead branches deciduous phenomenon in the later stage; The jujube saplings on the case of N fertilized uniformly stopped growth shortly after germination，or even died. The reason for these was that the excessive concentration of nitrogen led to the increase of soil ammonia volatilization, and finally made the roots be poisoned, mean while, the effectiveness of soil moisture were reduced because of the excessive concentration of soil nitrogen. |