Development of a Critical Nitrogen Dilution Curve of Double Cropping Rice in South China

Frontiers in Plant Science
Zhiyuan HeLiang Tang

Abstract

The concept of critical nitrogen (Nc) concentration can be implemented to diagnose in-season plant nitrogen (N) status for optimizing N fertilizer management. The Nc dilution curves have been established for rice (Oryza sativa L.) grown in different climatic regions, yet no attempt has been made to develop the Nc dilution curve for double cropping rice regions. This study was undertaken to develop the Nc dilution curves for double cropping rice in south China for assessment of in-season N status and to establish the relationships N nutrition index (NNI) and relative yield (RY) for in-season prediction of rice grain yield. Three different N application rate field experiments using six Indica rice varieties, including two early rice hybrids and four late rice hybrids were carried out in east China. The Nc dilution curves based on whole plant N concentration were determined and described as, Nc = 3.37 W(-0.44) for early rice and Nc = 3.69 W(-0.34) for late rice. The constant N concentration at early growth stage was 3.31 and 3.15% DM for early and late rice, respectively. Late rice showed a higher capacity of N accumulation and a lower rate of N decline per unit shoot biomass as compared to early rice. The curves for present study...Continue Reading

References

Feb 19, 2009·Proceedings of the National Academy of Sciences of the United States of America·Xiao-Tang JuFu-Suo Zhang
Feb 13, 2010·Science·J H GuoF S Zhang
Dec 27, 2016·Frontiers in Plant Science·Syed Tahir Ata-Ul-KarimWeixing Cao
Mar 7, 2017·Scientific Reports·Syed Tahir Ata-Ul-KarimWeixing Cao

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