Effects of liquid hog manure on soil available nitrogen status, nitrogen leaching losses and wheat yield on a sandy loam soil of western Canada

(ProQuest: Formulae and/or non-USASCII text omitted)Manure can improve soil quality and enhance crop yields. However, excessive manure use may contribute to nitrate ... leaching, particularly on coarse-textured soils. The objective of this study was to evaluate the effects of liquid hog manure (LHM) on wheat yield, soil available N and ... leaching on a sandy soil in Manitoba. Manure treatments included three rates of LHM applied to supply 64 (low), 128 (medium) and 192 kg N ha super(-1) (high) in 3 consecutive years (2002-2004). Unamended plots were used as a control. Available nitrogen was measured three times during each growing season at soil depths of 0-15, 15-30, 30-60, 60-90, and 90-120 cm. Undisturbed soil core lysimeters were used to measure ... leaching. Crop yields (grain and straw), N-uptake and N use efficiency were assessed at the end of each growing season. In 2002 and 2003, LHM had little effect on wheat yield, N nutrition and ... leaching due to below-normal rainfall in both years. In contrast, in 2004 when precipitation was above normal, LHM amendment increased grain yield and plant N-uptake. Relative to the control, grain yield was 20, 30 and 50% greater in the low, medium and high manure-N plots, respectively. Manure increased soil available N concentration 1.2-, 1.3- and 1.7-fold and induced additional ... leaching of 4.7, 28.4 and 54.5 kg ha super(-1) in the low, medium and high manure-N plots, respectively. Results suggest that LHM should be used with caution on sandy soils due to leaching potential in years of high precipitation and low crop yields in years of low precipitation.Original Abstract: (ProQuest: Formulae and/or non-USASCII text omitted)Le fumier peut rehausser la qualite du sol et accroitre le rendement des cultures. Neanmoins, en quantite excessive, il peut aussi conduirea la lixiviation des nitrates ..., surtout dans les sols a texture grossiere. Cette etude devait evaluer les consequences de l'epandage de lisier de porc sur le rendement du ble, sur la quantite de N disponible et sur la lixiviation du ... dans un sol sablonneux du Manitoba. Les traitements consistaient en trois taux d'application du lisier de porc, a savoir 64 (faible), 128 (moyen) et 192 kg de N par hectare (eleve), pendant trois annees consecutives (2002-2004). Des parcelles non bonifiees ont servi de temoin. La concentration d'azote disponible a ete etablie a trois reprises, durant chaque periode vegetative, a une profondeur de 0-15, 15-30, 30-60, 6