| 氮素对棉花氮素利用率和产量的影响 |
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| 作者姓名： | 薛晓萍 郭文琦 周治国 |
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| 作者单位： | [1]南京农业大学／农业部作物生长调控重点开放试验室,南京210095 [2]山东省气候中心,济南250031 |
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| 基金项目： | 农业部农业结构调整技术研究专项基金，国家自然科学基金，江苏省自然科学基金 |
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| 摘 要： | 目的]研究氮素对棉花氮素利用率、产量及产量构成的影响,为棉花生产施氮量的合理调控提供依据.方法]在大田栽培条件下,分别在长江流域下游棉区(江苏南京)和黄河流域黄淮棉区(河南安阳)设置棉花氮素水平试验.结果]棉株氮素利用率随初花后棉花生育进程的推进,呈现为不规则的S型曲线的变化趋势;氮素对棉花产量形成有一定的调控作用,氮素水平过低或过高均导致产量降低.结论]安阳试点以360kg/ha的施氮量为最优,南京以240kg/ha最高;棉花单铃重、单株铃数是产量的主要决定因素.
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| 关 键 词： | 棉花 氮素水平 氮素利用率 产量 |
Effects of nitrogen rate applied on nitrogen use efficiency and lint yield of cotton |
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| Authors: | Xiao-Ping Xue |
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| Abstract: | In order to studying the effects of nitrogen (N) level on nitrogen use efficiency and lint yield of cotton, Several field experiments with different levels of N application were carried out in Nanjing and Anyang, standing for the ecological conditions in the middle lower reaches of Yangtze River Valley and Yellow River Valley in China, respectively. The results indicate that the dynamic developments of nitrogen use efficiency (NUE) with time during plant-growing period presented with S curve. The NUE and momentary NUE registered their highest value at the nitrogen application level of 360kg·ha-1 in Anyang and 240kg·ha-1 in Nanjing. The lint yield increased with the increasing N rate of supply, and registered its highest value at 360 kg·ha-1 and 240 kg·ha-1 for Anyang and Nanjing, respectively. The weight per boll and boll number per plant were the most important contributors to yield, and received theirs highest values with 240 kg·ha-1 and 360 kg·ha-1 N rate of application respectively. |
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| Keywords: | Cottonzz Nitrogen level of supplyzz nitrogen use efficiencyzz Yieldzz |
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