@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS010 prodottidellaricerca:prodotto prodotto:ID182123 . @prefix pubblicazioni: . @prefix unitaDiPersonaleEsterno: . unitaDiPersonaleEsterno:ID5077 pubblicazioni:autoreCNRDi prodotto:ID182123 . @prefix rdf: . @prefix retescientifica: . prodotto:ID182123 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID182123 rdfs:label "Efficiency of controlled drainage and subirrigation in reducing nitrogen losses from agricultural fields (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID182123 pubblicazioni:anno "2010-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1016/j.agwat.2010.09.008"^^xsd:string . @prefix skos: . prodotto:ID182123 skos:altLabel "
Gabriele Bonaiti (a); Maurizio Borin (b) (2010)
Efficiency of controlled drainage and subirrigation in reducing nitrogen losses from agricultural fields
in Agricultural water management (Print); Academic Press Elsevier, Amsterdam (Paesi Bassi)
"^^rdf:HTML ; pubblicazioni:autori "Gabriele Bonaiti (a); Maurizio Borin (b)"^^xsd:string ; pubblicazioni:paginaInizio "343"^^xsd:string ; pubblicazioni:paginaFine "352"^^xsd:string ; pubblicazioni:numeroVolume "98"^^xsd:string . @prefix ns10: . prodotto:ID182123 pubblicazioni:rivista ns10:ID350611 ; pubblicazioni:pagineTotali "10"^^xsd:string ; pubblicazioni:numeroFascicolo "2"^^xsd:string ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:affiliazioni "a) Biological and Agricultural Engineering Department, Texas A&M University, 201 Scoates Hall, College Station, TX 77843-2117, USA; \nb) Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Via Romea, 16, 35020 Legnaro, Padova, Italy"^^xsd:string ; pubblicazioni:titolo "Efficiency of controlled drainage and subirrigation in reducing nitrogen losses from agricultural fields"^^xsd:string ; prodottidellaricerca:abstract "In northeast Italy, a regimen of controlled drainage in winter and subirrigation in summer was tested as a strategy for continuous water table management with the benefits of optimizing water use and reducing unnecessary drainage and nitrogen losses from agricultural fields.\nTo study the feasibility and performance of water table management, an experimental facility was set up in 1996 to reproduce a hypothetical 6-ha agricultural basin with different land drainage systems existing in the region. Four treatments were compared: open ditches with free drainage and no irrigation (O), open ditches with controlled drainage and subirrigation (O-CI), subsurface corrugated drains with free drainage and no irrigation (S), subsurface corrugated drains with controlled drainage and subirrigation (S-CI). As typically in the region free drainage ditches were spaced 30 m apart, and subsurface corrugated drains were spaced 8 m apart.\nData were collected from 1997 to 2003 on water table depth, drained volume, nitrate-nitrogen concen- tration in the drainage water, and nitrate-nitrogen concentration in the groundwater at various depths up to 3m.\nSubsurface corrugated drains with free drainage (S) gave the highest measured drainage volume of the four regimes, discharging, on average, more than 50% of annual rainfall, the second-highest concentration of nitrate-nitrogen in the drainage water, and the highest nitrate-nitrogen losses at 236 k ha-1 .\nOpen ditches with free drainage (O) showed 18% drainage return of rainfall, relatively low concentra- tion of nitrate-nitrogen in the drainage water, the highest nitrate-nitrogen concentration in the shallow groundwater, and 51 kg ha-1 nitrate-nitrogen losses.\nBoth treatments with controlled drainage and subirrigation (O-CI and S-CI) showed annual rainfall drainage of approximately 10%. O-CI showed the lowest nitrate-nitrogen concentration in the drainage water, and the lowest nitrogen losses (15 kg ha-1 ). S-CI showed the highest nitrate-nitrogen concentration in the drainage water, and 70 kg ha-1 nitrate-nitrogen losses. Reduced drained volumes resulted from the combined effects of reduced peak flow and reduced number of days with drainage.\nA linear relationship between daily cumulative nitrate-nitrogen losses and daily cumulative drainage volumes was found, with slopes of 0.16, 0.12, 0.07, and 0.04 kg ha-1 of nitrate-nitrogen lost per mm of drained water in S-CI, S, O, and O-CI respectively.\nThese data suggest that controlled drainage and subirrigation can be applied at farm scale in northeast Italy, with advantages for water conservation."@en . @prefix ns11: . prodotto:ID182123 pubblicazioni:editore ns11:ID42 ; prodottidellaricerca:prodottoDi istituto:CDS010 ; pubblicazioni:autoreCNR unitaDiPersonaleEsterno:ID5077 . ns10:ID350611 pubblicazioni:rivistaDi prodotto:ID182123 . ns11:ID42 pubblicazioni:editoreDi prodotto:ID182123 .