{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,24]],"date-time":"2025-12-24T21:04:31Z","timestamp":1766610271425},"reference-count":25,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2015,1,20]],"date-time":"2015-01-20T00:00:00Z","timestamp":1421712000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Funda\u00c3\u00a7ao para a Cie\u00cb\u2020ncia e a Tecnologia (FCT)","award":["PTDC\/ AGR-PRO\/119428\/2010"],"award-info":[{"award-number":["PTDC\/ AGR-PRO\/119428\/2010"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J. Plant Nutr. Soil Sci."],"published-print":{"date-parts":[[2015,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The characteristics of solid (SF) and liquid (LF) fractions resulting from solid\u2013liquid separation of pig slurry depend on the separation technique used. It can be assumed that the separation technique will also affect the nitrogen (N) availability to plants. A pot experiment was performed with ryegrass to compare the N\u2010recovery efficiency of SFs and LFs obtained with four frequently used separation techniques (centrifugation [Cent], sediment settling during 20 h [Sed], enhanced settling during 20 h by addition of cationic polyacrylamide [Sed+PAM], sieving [Siev], sieving followed by treatment of the resulting liquid fraction by PAM addition [Siev+PAM]) with the untreated slurry (US) and an unfertilized control. Increases (2\u201317%) of ryegrass dry matter yield (DMY) were obtained in LF treatments relative to US. However, this increase was statistically significant only for the Siev+PAM\u2010L treatment. A significant decrease of ryegrass DMY was observed in SF treatments relative to US. All treatments with SFs led to similar values of DMY while only small differences were observed between treatments receiving LFs. A significant correlation (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> = 0.968) was observed between the total DMY and the NH<jats:styled-content>$ _4^+ $<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-ueqn-1.gif\" xlink:title=\"equation image\" \/><\/jats:styled-content> \u2010 N : N<jats:sub>tot<\/jats:sub> ratio of the fraction applied suggesting that this is a major parameter to be considered when comparing separation techniques. Overall, the separation techniques showed only a weak effect on the dry matter yields and on the N \u2010 recovery efficiency from LF and SF although they strongly affected the nutrient concentration and speciation in each fraction.<\/jats:p>","DOI":"10.1002\/jpln.201400261","type":"journal-article","created":{"date-parts":[[2015,1,20]],"date-time":"2015-01-20T10:14:35Z","timestamp":1421748875000},"page":"229-236","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Recovery efficiency of nitrogen from liquid and solid fractions of pig slurry obtained using different separation technologies"],"prefix":"10.1002","volume":"178","author":[{"given":"David","family":"Fangueiro","sequence":"first","affiliation":[]},{"given":"Jo\u00e3o","family":"Coutinho","sequence":"additional","affiliation":[]},{"given":"Leandro","family":"Borges","sequence":"additional","affiliation":[]},{"given":"Ernesto","family":"Vasconcelos","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2015,1,20]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0021859600021572"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anifeedsci.2011.04.036"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.2134\/jeq2007.0083"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.biortech.2009.12.070"},{"key":"e_1_2_7_5_1","first-page":"199","article-title":"Untersuchungen \u00fcber die chemische Bodenanalyse als Grundlage f\u00fcr die Beurteilung des N\u00e4hrstoffzustandes des Bodens. 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