| 摘要: |
| 为了给河西走廊灌区春玉米的氮素管理提供理论依据,用田间试验方法于2006--2007年研究了不同氮水平下春玉米干物质积累和氮素吸收利用动态的规律.采用自然风干法和微量凯氏定氮法测定植株干重和氮素含量.结果表明:1)不同氮水平下春玉米干物质积累与其氯素的吸收均可以用logistic方程(y=K/(1+ea+n)拟合;2)施氮肥可显著影响到春玉米干物质最大积累速率和氮素最大吸收速率,前者N在225 kg/hm2处理下最高,为644.6 kg/(hm2·d),后者N在300 kg/hm2处理下最高,为5.1 kg/(hm2·d);3)施氮肥对春玉米干物质最大积累速率和氮素最大吸收速率出现的天数均无规律性变化,前者平均为92.5 d,后者平均为78.1 d,后者比前者出现平均提前了15 d左右;4)随着施氮量增加,春玉米氮素吸收效率增加,于出苗后110 d达到最大吸收率,到成熟期有所下降;而其利用率随着施氮量增加而降低,随着玉米生长而增加,至玉米成熟期达到峰值. |
| 关键词: 春玉米 干物质积累 氮素吸收利用 logistic方程 |
| DOI：10.11841/j.issn.1007-4333.2009.01.011 |
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| 基金项目:国家重点基础研究发展规划(973计划)，国家科技支撑计划? |
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| Impact of nitrogen application on the dynamics of dry matteraccumulation and nitrogen absorption and utilization of spring maize |
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| Abstract: |
| A two-year field experiment was conducted to analyse the dynamics of dry matter yield,nitrogen(N) absorption and utilization by spring maize under different N application rates in Hexi Corridor of Gansu Province in 2006-2007 to provide scientific foundation of N management of spring maize.Plant dry weight and N concentration were analyzed by air-dry method and micro-Kjeldahl method respectively.The results showed that both the dynamic dry matter yield and N absorption of spring maize could be described by L... |
| Key words: spring maize dry matter accumulation nitrogen absorption and utilization efficiency logistic equation |
