As bio-integrated systems that link both plants and fish culture, inside aquaponic
systems, the processes of ammonia-oxidizing and nitrification in nitrite and nitrate
are essential for growth and development of both fish and plants culture biomass.
Plants with nearly the same nutritional requirements during their life cycle, like
spinach in our case, are recommended to be grown under aquaponic conditions.
Although nitrates concentrations up to 200 – 250mg/l are reported to be acceptable
for fish growth, in the last years the toxic effect of long term exposure to high
nitrate levels on fish and plants cultured biomass were highlighted. The main goal
of the present study is to compare the nitrate level of spinach, grown in an
aquaponic system, under three plant densities (V1 - 59 plants/m2, V2 - 48plants/m2
and V3 – 39 plants/m2). The second objective is to compare the results obtained,
in term of nitrate content, for spinach grown in the integrated rainbow trout –
spinach aquaponic system with those of marketable spinach, grown under
conventional condition, in the field. The experimental design consists in a
recirculating aquaculture system with 12 growing units, mechanical and biological
water treatment units and four aquaponic units. Fish were fed with two types of
feed with 41% and 50% protein, using 3 different feeding regimes. The results
show a higher nitrate level on spinach grown in aquaponic system, compared to
the one derived from field culture. Differences were observed also among the
three variants grown in aquaponic conditions, under different plant densities. As a
conclusion, it can be said that considering the nitrate level, spinach grown in
aquaponic system is marketable
As bio-integrated systems that link both plants and fish culture, inside aquaponic
systems, the processes of ammonia-oxidizing and nitrification in nitrite and nitrate
are essential for growth and development of both fish and plants culture biomass.
Plants with nearly the same nutritional requirements during their life cycle, like
spinach in our case, are recommended to be grown under aquaponic conditions.
Although nitrates concentrations up to 200 – 250mg/l are reported to be acceptable
for fish growth, in the last years the toxic effect of long term exposure to high
nitrate levels on fish and plants cultured biomass were highlighted. The main goal
of the present study is to compare the nitrate level of spinach, grown in an
aquaponic system, under three plant densities (V1 - 59 plants/m2, V2 - 48plants/m2
and V3 – 39 plants/m2). The second objective is to compare the results obtained,
in term of nitrate content, for spinach grown in the integrated rainbow trout –
spinach aquaponic system with those of marketable spinach, grown under
conventional condition, in the field. The experimental design consists in a
recirculating aquaculture system with 12 growing units, mechanical and biological
water treatment units and four aquaponic units. Fish were fed with two types of
feed with 41% and 50% protein, using 3 different feeding regimes. The results
show a higher nitrate level on spinach grown in aquaponic system, compared to
the one derived from field culture. Differences were observed also among the
three variants grown in aquaponic conditions, under different plant densities. As a
conclusion, it can be said that considering the nitrate level, spinach grown in
aquaponic system is marketable
การแปล กรุณารอสักครู่..
