ISSN:
1573-5036
Schlagwort(e):
Denitrification
;
Fertilizer application
;
Intermitten flooding
;
NH4
;
volatilization
;
Nitrification Urea Wetland rice
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Summary Wetland rice was cultivated in pots of puddled soil under continuous and intermittent flooding conditions. The soil was either fertilized with the surface application of prilled urea in three split doses or once with urea supergranules applied at different soil levels. The grain yield, fertilizer efficiency and percent nitrogen recovery by the grains were increased by deep placement of urea supergranules independent of the water regime. Grain yield was always lower with intermittent flooding, particularly when the plants were fertilized with the surface application of prilled urea. Nitrogen loss by ammonia volatilization, measured in a closed cuvette system, was reduced from 24% with the surface application of urea prills and 20% with surface application of urea supergranules to approximately 2% with deep placement of urea supergranules. Intermittent flooding created conditions which promoted additional nitrogen loss by nitrification and denitrification processes. The total nitrogen loss, measured in an open cuvette system, was about 38% with the surface application of urea supergranules, whereas this loss was reduced to 10% with deep placement of urea supergranules. Furthermore, deep placement of urea fertilizer reduced the nitrogen loss irrespective of water regime.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02275476
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