ISSN:
1439-0426
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
,
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Based upon a detailed study carried out 20 years ao on the sediment nitrogen content in the commercial carp ponds of Horvȧthpuszta intensive farm and upon the reexamination of the same 19 ponds, we found an average annual rate of nitrogen accumulation of 174 pg N g-' dry sediment. Nitrogen budgeting for the 20 years (1970–1990) was completed for input nitrogen sources of inorganic fertilization, duck feed, fish feed, manure, atmosphere deposition, filling water and nitrogen fixation, as well as for output sources of alfalfa, fish, rice, duck yield, drainage water and denitrification. The average annual nitrogen retention of 93 kg ha-1 corresponded well to the 174 μg Ng-1 measured value of nitrogen accumulation. During the 20 years of nitrogen accumulation on industrialized agricultural land of Hungary, the intensive fish farm received altogether 1246 tonnes of nitrogen and released only 686 tonnes to the environment. Therefore removing, processing and accumulating most of the available nitrogen while minimizing the pollution to the environment is one of the challenges for the future for both aquacultural and agricultural activities.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1439-0426.1994.tb00174.x
Permalink
