Regulation of nitrogen balance and yield on greenhouse eggplant under biochar addition in Mollisol

Yao Wang, Meng Zhou, Meng Hou, Yimin Chen, Yueyu Sui and Xiaoguang Jiao
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Yao Wang: Collegeof Modern Agriculture and Ecological Environment, Heilongjiang University, Harbin, China
Meng Zhou: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China Yao Wang and Meng Zhou have contributed equally to this work and share the first authorship.
Meng Hou: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China Yao Wang and Meng Zhou have contributed equally to this work and share the first authorship.
Yimin Chen: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China Yao Wang and Meng Zhou have contributed equally to this work and share the first authorship.
Yueyu Sui: Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China Yao Wang and Meng Zhou have contributed equally to this work and share the first authorship.
Xiaoguang Jiao: Collegeof Modern Agriculture and Ecological Environment, Heilongjiang University, Harbin, China

Plant, Soil and Environment, 2022, vol. 68, issue 1, 36-48

Abstract: Maintaining nitrogen (N) balance and inhibiting N leaching loss in the soil-crop system is crucial to maintaining yield and reducing the environmental pollution. This study investigated the effects of soil NO3--N content and accumulation, eggplant yield, N leaching and balance response to biochar addition, including regular fertilisation and irrigation (W + F), biochar addition with regular fertilisation and irrigation (W + F + B), and biochar addition with 20% fertilisation and irrigation reduction (0.8W + 0.8F + B) treatments. Compared with W + F, W + F + B and 0.8W + 0.8F + B increased soil NO3--N content in 0-40 cm and soil NO3--N accumulation in 0-20 cm, and raised harvest index, N surplus and balance. Simultaneously, 0.8W + 0.8F + B compared to W + F enhanced N use efficiency and N partial factor productivity, conversely, it decreased N dry matter production efficiency, N surplus and balance. Stepwise regression analysis demonstrated that the effect of NO3--N leaching lasted in 60 cm under biochar addition in the first year, and lasted in 20 cm without biochar application in the next year. Altogether, biochar addition with 20% fertilisation and irrigation reduction is the most suitable management strategy to decrease N surplus and leaching, and maintain eggplant N uptake in a two-year cycle system on greenhouse vegetables in Mollisols.

Keywords: soil profile; soil fertiliser; soil chemical; NH3 volatilisation; nitrification and denitrification loss (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:68:y:2022:i:1:id:393-2021-pse

DOI: 10.17221/393/2021-PSE

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