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Titolo:
Effects of bottom soil management practices on water quality improvement in channel catfish Ictalurus punctatus ponds
Autore:
Seo, JW; Boyd, CE;
Indirizzi:
Auburn Univ, Dept Fisheries & Allied Aquacultures, Auburn, AL 36849 USA Auburn Univ Auburn AL USA 36849 Allied Aquacultures, Auburn, AL 36849 USA
Titolo Testata:
AQUACULTURAL ENGINEERING
fascicolo: 2, volume: 25, anno: 2001,
pagine: 83 - 97
SICI:
0144-8609(200109)25:2<83:EOBSMP>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOTAL NITROGEN;
Keywords:
bottom soils; nutrients; pond aquaculture; catfish; phosphorus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Boyd, CE Auburn Univ, Dept Fisheries & Allied Aquacultures, Auburn, AL 36849 USA Auburn Univ Auburn AL USA 36849 uacultures, Auburn, AL 36849 USA
Citazione:
J.W. Seo e C.E. Boyd, "Effects of bottom soil management practices on water quality improvement in channel catfish Ictalurus punctatus ponds", AQUACULT EN, 25(2), 2001, pp. 83-97

Abstract

The bottoms of four ponds on the Auburn University Fisheries Research Unit, Auburn, AL, were dried for 1 month and tilled with a roto-tiller (dry-till treatment). Four other ponds were dried and tilled, sodium nitrate (200 kg ha(-1)) was applied to oxidize bottom soil, and soils were tilled again to mix bottom soil with sodium nitrate (dry-till with sodium nitrate treatment). Four ponds were not subjected to bottom drying, tilling or sodium nitrate treatment (controls). Channel catfish (Ictalurus punctatus) fingerings were stocked at 15,000 ha(-1). Selected water quality variables were measured at 1-2-week intervals during the,growing season. Concentrations of most variables increased over time because feeding rates were progressively increased as fish grew. Compared to controls, both treatments had lower concentrations of soluble reactive phosphorus, nitrate nitrogen, nitrite nitrogen,total ammonia nitrogen, total suspended solids and turbidity, and higher values of pH, Secchi disk visibility, total alkalinity, total hardness, and calcium hardness (P < 0.01). Ponds of the dry-till treatment had in addition lower concentrations (P < 0.01) of total phosphorus and total nitrogen than control ponds. Concentrations of dissolved oxygen and chemical oxygen demand did not differ significantly among the treatments (P > 0.05). Comparedto the control, both treatments had lower concentration of chlorophyll a from June to July (P = 0.004), but controls had lower concentrations of chlorophyll a from August to September than both treatments (P < 0.001). Organic carbon, total phosphorus, and dry pH in soil samples did not differ amongthe treatments (P > 0.05). The findings suggest that water quality improvement can be achieved by drying and tilling pond bottoms between crops. Applying sodium nitrate to dry, tilled pond bottoms did not increase the degreeof water quality improvement. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:22:54