Agriculture Reference
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Figure 10. Results of 15-d hydroponic cultures of barley using 4-d culture broths of seaweeds, mixture
of seaweeds, mixture of seaweeds and fish wastes, and commercial seaweed fertilizer.
During the 15-d hydroponic cultures, the stems and leaves of both plants grew as the
roots elongated. The 4-d culture broths of seaweeds, except for the brown seaweed, exhibited
better growth (improved stem height and leaf length in the kidney bean hydroponic culture)
than commercial seaweed fertilizer (Figure 9).
The mixture of the culture broths of the three seaweeds and its mixture with fish waste
also exhibited comparable results with those results of the commercial seaweed fertilizer.
Except for the brown seaweed culture broth, this trend was also observed in the result of the
barley hydroponic culture within the significant difference (Figure 10). The brown seaweed
culture broth exhibited better growth for barley than for kidney bean. Consequently, the
fertilizing ability of all the 4-d culture broths of seaweeds was comparable with the
commercial seaweed fertilizer. This result was not surprising not only because seaweed
extracts are non-toxic, non-polluting and non-hazardous to human, animals and birds, unlike
chemical fertilizers (Dhargalkar & Pereira, 2005) but also because seaweeds contain naturally
occurring plant-growth regulators (Gupta et al., 2011).
Zero Emissions
In general, some wastewater is unavoidably generated during the process of fishery waste
reutilization (Yano et al., 2008). As observed in this chapter, however, there were no
additional emissions of waste during the bioconversion for the production of liquid fertilizer
from seaweed waste. Therefore, this process is zero-emissions with perfect resource
recycling. This method can provide the acquisition of a novel resource as the liquid fertilizer
from seaweed wastes and can prevent coastal area pollution or the disruption of the climate.
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