Effects of nitrogen application stage on grain yield and nitrogen use efficiency of high-yield summer maize

P. Lü, J.W. Zhang, L.B. Jin, W. Liu, S.T. Dong and P. Liu
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P. Lü: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China
J.W. Zhang: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China
L.B. Jin: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China
W. Liu: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China
S.T. Dong: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China
P. Liu: State Key Laboratory of Crop Biology and College of Agronomy, Shandong Agricultural University, Tai'an, Shandong, P.R. China

Plant, Soil and Environment, 2012, vol. 58, issue 5, 211-216

Abstract: This study aims to explore the optimum nitrogen (N) application method by analyzing effects of variable N application stages and ratios on the N absorption and translocation of high-yield summer maize (DH661). The study included field experiments and 15N isotopic dilutions for pot experiments. Results showed that the yield was not increased in a one-off N application at the jointing stage. The uptake of fertilizer-derived N in the grain increased with the increasing of N applied times. Compared to a single or double application, total N uptake (Nup) and biomass increased significantly by supplying N at the six-leaf stage (V6), ten-leaf stage (V10) and 10 days after anthesis in ratios of 3:5:2 and 2:4:4. The fertilizer-derived recovery rates were 67.5% and 78.1%, respectively. The uptake and utilization of fertilizer-derived N was enhanced by increasing the recovery rate of N supplied after anthesis, and reducing the absorption of soil-derived N. Therefore, the 2:4:4 application ratios was the optimal N application method.

Keywords: N application method; 15N isotope tracer; N uptake and translocation; soil N; N fertilizer (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:58:y:2012:i:5:id:531-2011-pse

DOI: 10.17221/531/2011-PSE

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