University of Oulu

Guo, L.; Yu, H.; Kharbach, M.; Wang, J. The Response of Nutrient Uptake, Photosynthesis and Yield of Tomato to Biochar Addition under Reduced Nitrogen Application. Agronomy 2021, 11, 1598.

The response of nutrient uptake, photosynthesis and yield of tomato to biochar addition under reduced nitrogen application

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Author: Guo, Lili1,2,3; Yu, Huiwen4; Kharbach, Mourad5;
Organizations: 1Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Højbakkegaard Alle 13, DK-2630 Taastrup, Denmark
2College of Water Resources and Architectural Engineering, Northwest A&F University, Weihui Road 23, Yangling 712100, China
3Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, China
4Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, DK-1958 Frederiksberg C, Denmark
5Research Unit of Mathematical Sciences, University of Oulu, FI-90014 Oulu, Finland
6College of Resources and Environment, Shanxi University of Finance and Economics, Taiyuan 030000, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2021
Publish Date: 2021-10-27


Tomato is an important economic crop that is widely consumed worldwide. Tomato production is mainly limited by the use of nitrogen fertilizer, sunlight, soil and water conditions. Biochar is one of the soil amendments, and it is recognized as a promising practice for improving crop production in agriculture. The effect of biochar on the photosynthetic traits and tomato yield under reduced nitrogen fertilizer application is still not well understood. The objective of this research is to investigate the influence of biochar application on the photosynthesis and yield of tomato under reduced nitrogen fertilizer application from the perspectives of the nutrient uptake of plants (nitrogen and phosphorus), leaf photosynthetic pigment and leaf gas exchange parameters. Two-year greenhouse experiments containing six biochar levels (0, 10, 30, 50, 70, and 90 t ha⁻¹) and two nitrogen fertilizer application rates (190 and 250 kg ha⁻¹) were conducted. Compared with C0, C50 significantly improved the nitrogen uptake (74–80%) and phosphorus uptake (76–95%) by tomato plants and further enhanced the photosynthetic traits of tomato leaves (net photosynthetic rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and chlorophyll (2–60%), which lead to the highest gains in tomato yield (more than 50%) even when the applied nitrogen fertilizer was significantly reduced (from 250 kg ha⁻¹ to 190 kg ha⁻¹). The photosynthesis rate had a linear correlation with the total nitrogen and phosphorus accumulation and tomato yield. The results will enhance our understandings about the effect of biochar on the photosynthesis and yield of tomato and be of importance for practical agricultural management.

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Series: Agronomy
ISSN: 2073-4395
ISSN-E: 2073-4395
ISSN-L: 2073-4395
Volume: 11
Issue: 8
Article number: 1598
DOI: 10.3390/agronomy11081598
Type of Publication: A1 Journal article – refereed
Field of Science: 4111 Agronomy
Funding: This research was funded by the National Key Research and Development Project (grant number: 2016YFC0400202) and the National Natural Science Foundation Program (grant number: 51679205).
Copyright information: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (