Responses of rice (Oryza sativa L.) nitrogen status indicators to nitrogen rates during the different rice growth stages

文献类型： 外文期刊

第一作者： Zhang, Qingwen

作者： Zhang, Qingwen;Yang, Zhengli;Zhang, Aiping;Wang, Ming

作者机构：

关键词： Rice (Oryza sativa L.);N nutrition status;SPAD;N uptake rate

期刊名称：ADVANCES IN ENVIRONMENTAL TECHNOLOGIES, PTS 1-6

ISSN： 1022-6680

年卷期： 2013 年 726-731 卷

页码：

收录情况： SCI

摘要： The SPAD was shown as a diagnostic tool to assess the nitrogen (N) nutrition status. The objective of this study is to evaluate the performance of SPAD as N nutrition status for rice. We conducted two years field experiment in the Ningxia irrigation area. Five N application rates were applied to rice to obtain contrasting conditions of N availability. The leaves N concentrations, SPAD and N uptake by rice were assessed. The results showed that response of SPAD to N uptake rate depends on the developmental stage of the rice. The peak periods for N uptake by rice were the jointing-booting stage to the flowering stage. Significant regression equations were established between SPAD and N uptake. The SPAD meter was demonstrated to be a useful nondestructive system to aid in the evaluation of N nutrition status in rice. However, consistency in sample seasonal timing may necessitate to correlate SPAD values.

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