| 不同供氮方式和施氮量对烤烟生长和氮素吸收的影响 |
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| 引用本文： | 秦艳青,李春俭,赵正雄,武雪萍,张福锁.不同供氮方式和施氮量对烤烟生长和氮素吸收的影响[J].植物营养与肥料学报,2007,13(3):436-442. |
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| 作者姓名： | 秦艳青 李春俭 赵正雄 武雪萍 张福锁 |
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| 作者单位： | 1.农业部植物营养与养分循环重点开放实验室;教育部植物-土壤相互作用重点实验室;中国农业大学资源与环境学院 北京100094; |
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| 基金项目： | 国家引进国际先进农业科学技术计划(948计划) |
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| 摘 要： | 2005年5月至9月在云南玉溪采用田间试验和微区试验相结合的方法,研究了传统施肥和优化施肥2个施氮水平对烤烟生长和氮素积累的影响。结果表明,施N.120.kg/hm2的烟株在打顶以后以吸收土壤氮为主;施N52.5.kg/hm2的烟株在团棵期以后以吸收土壤氮为主,该施氮量能够保证烟株从移栽至打顶(即移栽后60.d)阶段的生长需要。但与施N.120.kg/hm2相比,植株氮素营养略有不足,烟株各部位及整株的干物重和氮素积累量略有降低;各时期干物重的分配比例没有区别。另外,打顶期和成熟期,两施氮处理植株所吸收的肥料氮绝对量差异达显著水平,施氮量越高,吸收量也越大。同时,施氮量越多,各个时期各部位和整株中肥料氮的比例越大,且均在团棵期达到最大值;之后呈下降趋势,施氮越多,下降幅度越小。两处理植株都呈现肥料氮比例随叶位上升而减少的规律,施氮量越高,部位间差异越小。
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| 关 键 词： | 氮素 烤烟 优化施肥 |
| 文章编号： | 1008-505X（2007）03-0436-07 |
| 收稿时间： | 2006-01-20 |
| 修稿时间： | 2006-05-10 |
Effects of rates and methods of N application on growth and N uptake of flue-cured tobacco |
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| QIN Yan-qing,LI Chun-jian,ZHAO Zheng-xiong,WU Xue-ping,ZHANG Fu-suo.Effects of rates and methods of N application on growth and N uptake of flue-cured tobacco[J].Plant Nutrition and Fertilizer Science,2007,13(3):436-442. |
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| Authors: | QIN Yan-qing LI Chun-jian ZHAO Zheng-xiong WU Xue-ping ZHANG Fu-suo |
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| Affiliation: | 1.Key Laboratory of Plant Nutrition and Nutrient Cycling;MOA;Key Laboratory of Plant-Soil Interactions;MOE;Department of Plant Nutrition;CAU;Beijing 100094;China; |
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| Abstract: | Our previous study showed that both changing N applying method and reducing N application rate to 52.5kg /ha could meet the growth requirement of tobacco plant for N. A field experiment combining with a microplot in Yunnan province was carried out to further study the effects of N fertilization on the growth and N uptake of flue-cured tobacco. Two N application rates of 120 and 52.5 kg /ha were used. The results showed that tobacco supplied N 120 kg/hm2 mainly utilized soil N after topping, while soil N became the dominant N source after rosette for plants with N 52.5kg /ha. Nitrogen application with 52.5kg/ha could assure the growth of plants from the stage of transplanting to topping; but their dry matter gain and N accumulation decreased slightly comparing with the treatment of N 120 kg/ha due to inadequate N supply after topping. Changing N application rates had no effect on dry matter distribution in tobacco plant. The higher the rate of fertilizer N supplied, the more fertilizer N was found in the plant, and the higher the ratio of fertilizer N to total N in different organs and whole plant was. The highest ratio of the fertilizer N to total N in plant was found in rosette stage, and then it declined slowly. In addition, the ratio of the fertilizer N to total N in upper leaves was smaller than that in lower leaves. And the different of the ratio of fertilizer N to total N between the upper and lower leaves was smaller, when more N (120 kg/hm2) was supplied. |
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| Keywords: | N flue-cured tobacco optimized fertilization |
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