ISSN:
1432-0789
Keywords:
Manures
;
N mineralisation
;
N uptake
;
15N
;
Added nitrogen interactions
;
Priming effect
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Field and laboratory experiments were used to examine the efficiency of N uptake from various manure forms, and at different rates of application. In a field experiment, wheat was grown on soils with different amounts of 15N-labelled legume residues. The amount of N taken up by the crop was directly proportional to the amount applied, with a recovery of between 15% and 23% of the legume N. In a second field experiment, inorganic N was applied at rates varying from 0 to 120 kg N ha-1 in the presence and absence of poultry manure. The uptake of N by barley was 11 kg ha-1 greater in the manured plots when no inorganic N was applied, and 23 kg ha-1 greater when N was applied at the top rate. N uptake in a pot experiment was again shown to be directly proportional to the rate of manure application, but the amount of N taken up was strongly related to the N content of the manure. An incubation experiment demonstrated that net N mineralisation reached a maximum where residue concentrations were 1,5%. The significance of added nitrogen interactions in the context of manure-N additions is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00337214
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