Table 18.4 (continued)
Organic nutrient
sources
Method of
organic nutrient
solution
preparation
Nutrient content
of solution
Observations and
research gaps
Reference
levels were
87.8% and 92.7%
lower than the
control treatment,
respectively. The
fast depletion of
nutrients within
the organic nutrient sources points
to a need to
investigate influence of frequency
of nutrient change
on growth and
yield.
Fish waste, a
by-product of the
production of
dried bonito fish
flakes, with a
conventional
hydroponic fertilizer being a control treatment.
Oyster shell lime
was also used to
supplement minor
nutrients in all
treatments.
The fish waste
was added at a
rate of 300 g/
200 L of water
and inoculated
with bark compost as a microbial inoculant for
nutrient mineralization. The mixture was then
aerated for
50 days before
use.
The solution
contained
123 mg/L of
nitrates with no
ammonium. The
added oyster
shells provided
11.9 mmol Mg;
9.67 mmol Fe;
2.17 mmol B;
1.53 mmol Mn;
0.077 mmol Zn;
0.0113 mmol Cu;
0.005 mmol Mo;
and 62.7 mmol
Ca.
The tomato fruit
yield, Brix value
and ascorbic acid
content did not
differ significantly between
the organic and
inorganic nutrient
sources. Interestingly, for lettuce,
the organic fertilizer gave a significantly higher
yield and root
weight compared
to the conventional hydroponic
fertilizer. This
study shows that
using a high N
organic material
like fish waste,
can be critical in
developing a
workable organic
hydroponic nutrient solution.
Shinohara
et al. (2011)
Biogas slurry
from an unnamed
organic source.
The biogas slurry
was diluted with
water 5.22 times
with water, then
supplemented
with different P
The biogas slurry
contained the following nutrients:
N—0.73 g/L; P—
0.028 g/L; K—
0.74 g/L; NH 4 —
The biogas slurry
alone showed a
significantly
lower lettuce
shoot biomass
compared to other
Liu et al.
(2011)
(continued)
18 Some Perspectives on Vermicompost Utilization in Organic Agriculture
323
Organic nutrient
sources
Method of
organic nutrient
solution
preparation
Nutrient content
of solution
Observations and
research gaps
Reference
levels were
87.8% and 92.7%
lower than the
control treatment,
respectively. The
fast depletion of
nutrients within
the organic nutrient sources points
to a need to
investigate influence of frequency
of nutrient change
on growth and
yield.
Fish waste, a
by-product of the
production of
dried bonito fish
flakes, with a
conventional
hydroponic fertilizer being a control treatment.
Oyster shell lime
was also used to
supplement minor
nutrients in all
treatments.
The fish waste
was added at a
rate of 300 g/
200 L of water
and inoculated
with bark compost as a microbial inoculant for
nutrient mineralization. The mixture was then
aerated for
50 days before
use.
The solution
contained
123 mg/L of
nitrates with no
ammonium. The
added oyster
shells provided
11.9 mmol Mg;
9.67 mmol Fe;
2.17 mmol B;
1.53 mmol Mn;
0.077 mmol Zn;
0.0113 mmol Cu;
0.005 mmol Mo;
and 62.7 mmol
Ca.
The tomato fruit
yield, Brix value
and ascorbic acid
content did not
differ significantly between
the organic and
inorganic nutrient
sources. Interestingly, for lettuce,
the organic fertilizer gave a significantly higher
yield and root
weight compared
to the conventional hydroponic
fertilizer. This
study shows that
using a high N
organic material
like fish waste,
can be critical in
developing a
workable organic
hydroponic nutrient solution.
Shinohara
et al. (2011)
Biogas slurry
from an unnamed
organic source.
The biogas slurry
was diluted with
water 5.22 times
with water, then
supplemented
with different P
The biogas slurry
contained the following nutrients:
N—0.73 g/L; P—
0.028 g/L; K—
0.74 g/L; NH 4 —
The biogas slurry
alone showed a
significantly
lower lettuce
shoot biomass
compared to other
Liu et al.
(2011)
(continued)
18 Some Perspectives on Vermicompost Utilization in Organic Agriculture
323