| 施氮量对高产早稻氮素利用特征及产量形成的影响 |
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| 引用本文： | 曾勇军,石庆华,潘晓华,韩涛.施氮量对高产早稻氮素利用特征及产量形成的影响[J].作物学报,2008,34(8):1409-1416. |
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| 作者姓名： | 曾勇军 石庆华 潘晓华 韩涛 |
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| 作者单位： | 江西农业大学 / 江西省作物生理生态与遗传育种重点实验室, 江西南昌330045 |
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| 基金项目： | 国家粮食丰产科技工程项目
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超级稻配套栽培技术集成项目 |
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| 摘 要： | 以高产早稻组合陆两优996(两系)和金优463(三系)为材料, 通过不同的氮肥施用量对其氮素吸收特征、群体结构及产量形成进行了研究。结果表明: (1) 施氮有利于增加叶片叶绿素含量以及茎、叶、穗中的氮素含量, 提高叶面积指数, 促进齐穗期以前特别是分蘖盛期至齐穗期的干物质生产和氮素积累。施氮量增加, 分配到茎和叶中氮素的量及比例增加, 干物质生产效率和稻谷生产效率下降。(2) 每穗粒数和有效穗数是影响双季早稻产量的最主要因素, 适量施氮可以提高临界茎重以上的茎蘖比例, 增加每穗粒数。过量施氮会抑制水稻的前期分蘖, 降低临界茎重以上的茎蘖比例, 使每穗粒数降低, 同时影响后期特别是乳熟期以后的物质生产和氮素吸收。本试验条件下, 穗型较大、株型紧凑的组合陆两优996, 施氮量以225 kg hm-2为宜; 而分蘖力较强、穗型较小、株型较松散的组合金优463, 施氮量以180 kg hm-2为宜。
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| 关 键 词： | 施氮 早稻 氮素利用 产量形成 |
| 收稿时间： | 2008-01-02 |
| 修稿时间： | 1900-01-01 |
Effects of Nitrogen Application Amount on Characteristics of Nitrogen Utilization and Yield Formation in High Yielding Early Hybrid Rice |
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| ZENG Yong-Jun,SHI Qing-Hua,PAN Xiao-Hua,HAN Tao.Effects of Nitrogen Application Amount on Characteristics of Nitrogen Utilization and Yield Formation in High Yielding Early Hybrid Rice[J].Acta Agronomica Sinica,2008,34(8):1409-1416. |
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| Authors: | ZENG Yong-Jun SHI Qing-Hua PAN Xiao-Hua HAN Tao |
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| Institution: | ZENG Yong-Jun,SHI Qing-Hua*,PAN Xiao-Hua,HAN Tao |
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| Abstract: | Two early season hybrid rice combinations, Luliangyou 996(two-line) and Jinyou 463(three-line) were used to study the characteristics of nitrogen utilization and yield formation under different N application amounts. The results showed that with the increasing of N amount the contents of chlorophyll in leaf and the nitrogen accumulation in stem, leaf, and spike increased, the leaf area index(LAI) enlarged and the dry matter accumulation before full heading especially from tillering to full heading pro-moted, the amount and the distribution rate of N accumulation in stem and leaf increased, but N dry matter production efficiency (NDMPE) and N production efficiency (NPE) decreased. The yields of the two rice combination were mainly affected by spikelets per panicle and the number of effective panicles. Optimum N rate increased the rate of the tillers with more than the critical stem-weight (a standard dry weight of stem used for judging whether the tiller grew into effective panicle or not) and the spikelets per panicle. But, the excessive N application decreased the rate of the tillers with more than the critical stem-weight and the spikelets per panicle, resulting in the decrease of dry matter production in late growing stages especially after milky ripe. Under the fertile soil condition in this study, optimum N amount was 225 kg per hectare for Luliangyou 996 which has large spike and compact plant and 180 kg per hectare for Jinyou 463 which has smaller spike, relax plant, and strong tillering ability. |
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| Keywords: | Nitrogen fertilizer rate Early season rice Nitrogen utilization Yield formation |
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