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Lookup NU author(s): Dr Evangelos Petropoulos
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© 2022, The Author(s) under exclusive licence to Sociedad Chilena de la Ciencia del Suelo.Clarifying the contribution of soil and fertilizer nitrogen (N) to rice N uptake is crucial to understand the synergistic mechanism of nitrification inhibitors (NI) and formulate the application strategy. Herein, four typical hydromorphic paddy soils, two origins with two soil fertilites for each origin, were selected for the pot experiment, with two treatments: (a) conventional split fertilization with 15 N-labeled urea and (b) combined with NI (2-chloro-6-(trichloromethyl)-pyridine (CP)). We found that CP addition significantly increased 16.92% rice yield and 19.86% N uptake than the control, which was not affected by soil type. The variables of inorganic N in paddy water, soil inorganic N, and soil microbial functional genes (AOA, AOB, nirK, nirS, and nosZ) explained together ~ 75% of the total variation between samples. Meaningfully, soil NOX−-N content at the heading stage and NOX−-N concentration in paddy water at tillering fertilization stage were the two most important contributors; the earlier contributed more (23.2%, P < 0.05) than the latter (18.4%, P < 0.05). As a result, the increased N uptake of CP treatment from urea (12.83%) was lower than that from soil (23.92%). Also, the soil bacterial community showed a definite response to CP addition. Proteobacteria, acidobacteria, and chloroflexi were the dominant bacteria in paddies for the tested soils at the phylum level, but their response to CP addition varied with soil type. The results confirm the increasing effect of NI on N utilization, and soils contribute more than urea. The response of soil bacterial community to CP addition also deserves attention.
Author(s): Hou P, Zhao S, He S, Zhou Y, Petropoulos E, Willett I, Xue L, Yang L, Chen D
Publication type: Article
Publication status: Published
Journal: Journal of Soil Science and Plant Nutrition
Year: 2023
Volume: 23
Pages: 1019-1029
Online publication date: 27/12/2022
Acceptance date: 12/12/2022
ISSN (print): 0718-9508
ISSN (electronic): 0718-9516
Publisher: Springer Science and Business Media Deutschland GmbH
URL: https://doi.org/10.1007/s42729-022-01100-7
DOI: 10.1007/s42729-022-01100-7
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