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Broccoli residue-derived nitrogen immobilization following amendments of organic carbon: An incubation study

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dc.contributor.author Congreves, K.A.
dc.contributor.author Voroney, R.P.
dc.contributor.author O'Halloran, I.P.
dc.contributor.author Van Eerd, L.L.
dc.date.accessioned 2013-09-17T14:13:29Z
dc.date.available 2013-09-17T14:13:29Z
dc.date.issued 2013
dc.identifier.issn 1918-1833
dc.identifier.uri http://hdl.handle.net/10214/7548
dc.description.abstract Cole crops, compared with many other crops, can pose a high risk of N losses after harvest due to substantial quantities of readily mineralizable N in crop residues. Organic C amendments (OCA) may reduce N losses via immobilization; however, the synchrony of OCA decomposition and cole crop residue N mineralization is crucial. A soil incubation study evaluated net N and C mineralization of broccoli residue-derived N or fertilizer-derived N with three OCAs: wheat straw, yard waste, or used cooking oil, to predict N immobilization and the potential to mitigate post-harvest N losses. By the 56th d of incubation, broccoli residue mineralized 67.0 mg N kg -1. In the broccoli residue-derived N treatments, wheat straw, yard waste, and used cooking oil significantly reduced the quantity of net N mineralization by 16.9, 12.3, and 86.0 mg N kg -1, respectively. The net N mineralization data were fitted to a first-order exponential model, and the overall trend of OCA was negative, indicating immobilization, whether N was derived from broccoli residue or fertilizer. The order of effect from OCAs on N immobilization corresponded to the order of effect on net C mineralization, where wheat straw and yard waste were lower than used cooking oil. In broccoli residue treatments, compared with fertilizer, higher N immobilization occurred for used cooking oil, and higher net C mineralization occurred for used cooking oil and yard waste. The higher N immobilization and net C mineralization suggest that broccoli residue produced a synergistic effect on the decomposition of used cooking oil. Additionally, both broccoli residue and used cooking oil treatments had synchronous peaks of net C mineralization at 4 d. This study provides evidence to warrant field studies to confirm that the application of organic C, especially used cooking oil, after cole crop harvest may be a beneficial management practice to minimize soil N losses. en_US
dc.description.sponsorship Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) New Directions Program en_US
dc.language.iso en en_US
dc.publisher Canadian Journal of Soil Science en_US
dc.subject Post-harvest en_US
dc.subject cole crops en_US
dc.subject wheat straw en_US
dc.subject yard waste en_US
dc.subject used cooking oil en_US
dc.subject nitrogen and carbon dynamics en_US
dc.title Broccoli residue-derived nitrogen immobilization following amendments of organic carbon: An incubation study en_US
dc.type Article en_US
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dcterms.relation Congreves, K.A., Voroney, R. P. , O'Halloran, I. P. , and Van Eerd, L. L. 2013. Broccoli residue-derived nitrogen immobilization following amendments of organic carbon: An incubation study. Canadian Journal of Soil Science. 93: 23-31


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