Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

In pasture systems of southern Chile, nitrogen (N) fertilization is mostly carried out without considering soil N supply, while seasonal N plant uptake is partially accounted for. These aspects are fundamental to correctly decide N fertilization. The aim of this work was to determine soil N contribu...

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Autores principales:	Lobos Ortega,I, Alfaro,M, Martinez-Lagos,J
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2016
Materias:	Soil available nitrogen fertilization mineralization soil budget
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200012
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spelling	oai:scielo:S0718-951620160002000122016-10-24Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiencyLobos Ortega,IAlfaro,MMartinez-Lagos,J Soil available nitrogen fertilization mineralization soil budget In pasture systems of southern Chile, nitrogen (N) fertilization is mostly carried out without considering soil N supply, while seasonal N plant uptake is partially accounted for. These aspects are fundamental to correctly decide N fertilization. The aim of this work was to determine soil N contribution to grasslands yield in southern Chile and its implication for N use efficiency. Three treatments were distributed in a completely randomized block design with four replicates. A negative control treatment without N application and a positive control without N deficiency (450 kg N ha-1) were considered. An optimized treatment was also used, so that the total amount of mineral N applied as fertilizer was only that necessary to account for the arithmetic difference among plant uptake and N soil supply, resulting in the application of 171 kg N ha-1 only. Soil mineralization was high (241-934 kg N ha-1) and strongly affected by soil available N (VIP > 0.8). The 450 kg N ha-1 treatment produced 1,726 kg DM more than the 171 kg N ha-1 treatment. Nevertheless, this increase was associated to the application of an extra 279 kg N ha-1, so that the extra yield was produced at a 6 kg DM kg-1N efficiency. This value was one third of that showed by the optimized treatment, which was1.8times more efficient in the use of N than the 450 kg N ha-1 treatment, on average. Results suggest that it is possible to adjust pasture’s N fertilization considering soil N contribution via mineralization, and that this improves resources efficiency while maintaining pasture productivity.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.16 n.2 20162016-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200012en10.4067/S0718-95162016005000027
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Soil available nitrogen fertilization mineralization soil budget
spellingShingle	Soil available nitrogen fertilization mineralization soil budget Lobos Ortega,I Alfaro,M Martinez-Lagos,J Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
description	In pasture systems of southern Chile, nitrogen (N) fertilization is mostly carried out without considering soil N supply, while seasonal N plant uptake is partially accounted for. These aspects are fundamental to correctly decide N fertilization. The aim of this work was to determine soil N contribution to grasslands yield in southern Chile and its implication for N use efficiency. Three treatments were distributed in a completely randomized block design with four replicates. A negative control treatment without N application and a positive control without N deficiency (450 kg N ha-1) were considered. An optimized treatment was also used, so that the total amount of mineral N applied as fertilizer was only that necessary to account for the arithmetic difference among plant uptake and N soil supply, resulting in the application of 171 kg N ha-1 only. Soil mineralization was high (241-934 kg N ha-1) and strongly affected by soil available N (VIP > 0.8). The 450 kg N ha-1 treatment produced 1,726 kg DM more than the 171 kg N ha-1 treatment. Nevertheless, this increase was associated to the application of an extra 279 kg N ha-1, so that the extra yield was produced at a 6 kg DM kg-1N efficiency. This value was one third of that showed by the optimized treatment, which was1.8times more efficient in the use of N than the 450 kg N ha-1 treatment, on average. Results suggest that it is possible to adjust pasture’s N fertilization considering soil N contribution via mineralization, and that this improves resources efficiency while maintaining pasture productivity.
author	Lobos Ortega,I Alfaro,M Martinez-Lagos,J
author_facet	Lobos Ortega,I Alfaro,M Martinez-Lagos,J
author_sort	Lobos Ortega,I
title	Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
title_short	Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
title_full	Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
title_fullStr	Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
title_full_unstemmed	Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
title_sort	soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200012
work_keys_str_mv	AT lobosortegai soilnitrogencontributiontograsslandsanditsimplicationfornitrogenuseefficiency AT alfarom soilnitrogencontributiontograsslandsanditsimplicationfornitrogenuseefficiency AT martinezlagosj soilnitrogencontributiontograsslandsanditsimplicationfornitrogenuseefficiency
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Soil nitrogen contribution to grasslands and its implication for nitrogen use efficiency

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