Nitrogen recovery in soils amended with organic manures combined with inorganic fertilisers

Issue		Agron. Sustain. Dev. Volume 22, Number 7-8, November-December 2002 11th Nitrogen Workshop (Reims 2001)


Page(s)		739 - 746
DOI		10.1051/agro:2002061

Agronomie 22 (2002) 739-746
DOI: 10.1051/agro:2002061

Nitrogen recovery in soils amended with organic manures combined with inorganic fertilisers

Robert Rees and Katrina Castle

Scottish Agricultural College (SAC), Environment Division, Bush Estate, Edinburgh EH26 OPH, UK
(Received 3 September 2001; revised 29 April 2002; accepted 20 August 2002)

Abstract
Studies of N uptake by barley were carried out in SE Scotland between 1994 and 1996. Sites were planted in April of each year with spring barley (Hordeum vulgare) and treatments (control (no N), ammonium sulphate (60 kg N $\cdot$ ha ^-1), pig manure, sheep manure, cattle slurry (1994 and 1995 only), poultry manure) were applied to the soil surface at a rate which contained 120 kg total N $\cdot$ ha ^-1. Manure treatments also received ¹⁵N labelled ammonium sulphate at a rate of 60 kg N $\cdot$ ha ^-1. In all cases the yields of barley were increased significantly ( P < 0.001) by applications of manure or inorganic N fertiliser. The poultry manure increased yields significantly more than other treatments in all three years and also caused a short-term increase in biomass N concentrations. There was a significant correlation ( P < 0.001) between the water soluble organic carbon concentration of the manure at the time of application, and the total crop uptake of N at harvest. The proportion of labelled N recovered in the barley varied significantly ( P < 0.01) between treatments (ammonium sulphate 0.296, sheep manure 0.286, poultry manure 0.166, cattle slurry 0.229 and pig manure 0.227), demonstrating an interaction between the nitrogen and manure inputs.

Résumé
Prélèvement d'azote dans des sols amendés avec des fumiers organiques combinés avec des fertilisants inorganiques. Des études du prélèvement d'azote par l'orge ont été menées au sud-est de l'Écosse entre 1994 et 1996. Les sites ont été semés en avril de chaque année avec de l'orge de printemps (Hordeum vulgare) et des traitements (témoin sans azote, sulfate d'ammonium (60 kg N $\cdot$ ha ^-1), fumier de porcins, d'ovins, lisier de bovins (en 1994 et 1995 seulement), et fumier de volailles) ont été appliqués à la surface du sol à un taux qui contenait 120 kg N $\cdot$ ha ^-1. Les traitements aux fumiers ont été accompagnés de sulfate d'ammonium marqué ¹⁵N à un taux de 60 kg N $\cdot$ ha ^-1. Dans tous les cas, les rendements d'orge ont été augmenté significativement ( P < 0,001) par des applications de fumiers ou de fertilisants azotés inorganiques. Le fumier de volaille, plus que tout autre traitement, a augmenté les rendements significativement pendant les 3 années, et de plus a provoqué une augmentation à court terme des concentrations de N dans la biomasse. Il existait une corrélation significative ( P < 0,001) entre la concentration de carbone organique soluble du fumier au moment de l'application, et le prélèvement total de N par la culture à la récolte. La proportion de N marqué retrouvée dans l'orge a varié significativement ( P < 0,01) entre les traitements (sulfate d'ammonium 0,296 ; fumier d'ovin 0,286 ; de volailles 0,166, lisier de bovins 0,229 et fumier de porcins 0,227) démontrant une interaction entre l'azote et les apports de fumiers.

Key words: manures / nitrogen uptake / mineralisation / ¹⁵N

Mots clés : fumiers / prélèvement d'azote / minéralisation / ¹⁵N

Correspondence and reprints: Robert Rees
e-mail: b.rees@ed.sac.ac.uk

Communicated by Sylvie Recous (Laon, France), Bernard Nicolardot (Reims, France)

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