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Effect of Nitrogen Applied Before Transplanting on NUE in Rice

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Nitrogen (N) application before transplanting, where N fertilizers are applied in seedling-bed and carried to the paddy field with seedlings, is a novel method proposed in this article aiming for improving nitrogen utilization efficiency (NUE) in rice.The effect of this method on mineral N distribution in the rhizosphere soil was investigated in a field experiment with a japonica variety, Ningjing 2, in seasons of 2004 and 2005. There were four levels of N applied 16 h before transplanting:zero N (N0), 207 kg ha-1 (NL), 310.5 kg ha-1 (NM), and 414 kg ha-1 (NH). The result indicated that N fertilizer before transplantation had positive effect of increasing mineral N content in the rhizosphere soil of rice. Generally, N content in the rhizosphere soil of rice tended to increase with the amount of N fertilizer before transplanting, with the NH treatment having the largest effect. Additionally, N fertilizer before transplanting had significant influence on rice NUE and grain yield. Compared with other treatments, the NM treatment showed the largest influence, with basal-tillering NUE, total NUE, and grain yield being 15%, 12%, and 529.5 kg ha-1 higher than those of N0 treatment. This result indicated that N fertilizer before transplantation had positive effect on mineral N distribution in the rhizosphere soil of rice, thus improving NUE and grain yield.

ricenitrogen (N) application before transplantingnitrogen utilization efficiency (NUE)grain yield

ZHENG Yong-mei、DING Yan-feng、WANG Qiang-sheng、LI Gang-hua、WU Hao、YUAN Qi、WANG Hui-zhi、WANG Shao-hua

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Key Laboratory of Crop Growth Regulation, Ministry of Agriculture/Nanjing Agricultural University, Nanjing 210095, P.R. China

National Commissariat Fertility Technologies Program,ChinaNational Commissariat Fertility Technologies Program,China

2004BA520A03BE2004387

2007

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

影响因子：0.576
ISSN：2095-3119
年,卷(期)：2007.6(7)
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