Nitrogen placement at sowing affects root growth, grain yield formation, N use efficiency in maize
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Nitrogen placement at sowing affects root growth, grain yield formation, N use efficiency in maize Yi Cheng & Hui-Qin Wang & Peng Liu & Shu-Ting Dong & Ji-Wang Zhang & Bin Zhao & Bai-Zhao Ren
Received: 9 August 2020 / Accepted: 18 October 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Grain yields of summer maize are significantly affected by different nitrogen (N) rates and depths through regulating root growth and distribution in soil. Understanding of effects of the deep placement of N on the root and shoot growth, grain yield and N use efficiency in summer maize are limited. Methods In this study, four N rates: 225, 191.25, 157.5 and 0 kg ha−1 applied at four depths: 5, 10, 15, and 20 cm were studied. Soil N content, root dry weight, root length density, biomass, grain yield and N use efficiency of maize were measured. Results Compared to 225 kg N ha−1 applied at a depth of 5 cm, a 15% reduction in the N application rate at a depth of 15 cm induced a larger root length density in the subsoil, as well as a larger rooting depth. It also facilitated maintaining a higher level of biomass and N Yi Cheng and Hui-Qin Wang contributed equally to this work. Responsible Editor: Anton Wasson Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007 /s11104-020-04747-2. Y. Cheng : H.
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