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This long\u2010term study monitored water percolation as well as nitrate (NO<jats:sub>3<\/jats:sub>\u2013N) and total phosphorus (TP) leaching from liquid swine manure and chemical fertilizer applied to intact core lysimeters in a sandy loam soil in Manitoba, Canada. Water percolation, NO<jats:sub>3<\/jats:sub>\u2013N, and TP leaching were monitored from 2005 to 2016. Chemical fertilizer showed greater average annual mean water percolation (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.01), annual flow\u2010weighted mean concentration (FWMC) of NO<jats:sub>3<\/jats:sub>\u2013N (22\u00a0mg L<jats:sup>\u20131<\/jats:sup>; <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.001), and annual NO<jats:sub>3<\/jats:sub>\u2013N leaching (36\u00a0kg N ha<jats:sup>\u20131<\/jats:sup>; <jats:italic>p<\/jats:italic>\u00a0=\u00a0.002) compared with the manure treatment (FWMC NO<jats:sub>3<\/jats:sub>\u2013N, 15\u00a0mg L<jats:sup>\u20131<\/jats:sup>; NO<jats:sub>3<\/jats:sub>\u2013N leaching load, 22\u00a0kg N ha<jats:sup>\u20131<\/jats:sup>). Average annual mean TP loss did not differ between treatments (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.86). Spring (April\u2013June) was the most sensitive season, when\u00a0&gt;75% of annual percolation,\u00a0&gt;80% of annual NO<jats:sub>3<\/jats:sub>\u2013N, and\u00a0&gt;68% of annual TP leaching losses occurred from both manure and chemical fertilizer. Annual NO<jats:sub>3<\/jats:sub>\u2013N and TP leaching increased exponentially with cumulative winter and spring precipitation (control, <jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>\u00a0=\u00a0.69; manure, <jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>\u00a0=\u00a0.79; chemical fertilizer, <jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>\u00a0=\u00a0.63) and decreased with winter and spring air temperatures. The largest spring NO<jats:sub>3<\/jats:sub>\u2013N and TP leaching losses were observed in 2013, which followed the dry year of 2012, indicating the potential for nutrient flushing. The findings emphasize the need for environmentally sound N and P management strategies in cold North American regions underlain by coarse\u2010textured soils, particularly during the spring season.<\/jats:p>","DOI":"10.1002\/jeq2.20399","type":"journal-article","created":{"date-parts":[[2022,7,27]],"date-time":"2022-07-27T20:25:29Z","timestamp":1658953529000},"page":"1259-1269","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["The seasonality of nitrate and phosphorus leaching from manure and chemical fertilizer added to a chernozemic soil in Canada"],"prefix":"10.1002","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1413-9885","authenticated-orcid":false,"given":"Vivekananthan","family":"Kokulan","sequence":"first","affiliation":[{"name":"Dep. of Soil Science Univ. of Manitoba  Winnipeg MB R3T 2N2 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"O. 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