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作 者 ：谢志坚 涂书新 张嵚 李进平 徐昌旭

期 刊 ：植物营养与肥料学报 2013年 19卷 6期 页码：1477-1482

关键词：烤烟；移栽期；氮肥效应；相关性；

Keywords:flue-cured tobacco, transplanting date, correlation,

摘 要 ：采用田间试验的方法，研究了不同移栽期（5月5日、 15日和25日）对烤烟氮素的响应及其相关性的影响。结果表明，推迟移栽期至5月15~25日，烤烟产量和地上部各器官（烟叶与茎秆）中含氮量分别平均显著增加5.1%~6.1%和19.8%~55.2%，而且其对氮肥的农学利用率、 生理利用率、 土壤氮素依存率和氮素收获指数分别平均增加37.4%~49.8%、 30.4%~54.8%、 26.9%~29.1%和2.9%~5.7%。移栽期与氮肥农学利用率、 氮肥偏生产力和土壤氮素依存率呈现显著或者极显著正相关关系；氮肥农学利用率与氮肥生理利用率和土壤氮素依存率以及氮肥生理利用率与土壤氮素依存率均呈极显著正相关关系。因此，推迟移栽期至5月15~25日有利于提高氮素养分的增产能力。

Abstract: A field experiment was carried out to investigate the effects of different transplanting dates(5th,  15th and 25th of May) on the responses and correlations of flue-cured tobacco(FCT) seedlings to N fertilizer. The results show that when the transplanting date were postponed from 5th of May to 15th and 25th of May, both  the yield and N accumulated  in leaves and stems were remarkably increased by 5.1%-6.1%,  19.8%-55.2%; the corresponding agronomic nitrogen use efficiency,  physiological nitrogen use efficiency,  soil nitrogen dependent rate and nitrogen harvest index were increased by 37.4%-49.8%,  30.4%-54.8%,  26.9%-29.1% and 2.9%-5.7% respectively. Positively significant correlation were existed between postponed transplanting date and the indexes calculated such as agronomic nitrogen use efficiency,  partial factor productivity for nitrogen fertilizer and soil nitrogen dependent rate; and also among these indexes. Therefore,  postponing the transplanting date to 15th-25th in May is an effective way to improve tobacco yields and nitrogen fertilizer efficiency.

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