UTILIZATION OF EFFLUENT FISH FARMS IN LETTUCE PRODUCTION

Document Type : Original Article

Authors

1 PhD Stud., Ag. Eng. Dept., Fac. of Ag., Benha U., Egypt.

2 Assoc. Prof., Ag. Eng. Dept., Fac. of Ag., Benha U., Egypt.

3 Prof., Ag. Eng. Dept., Fac. of Ag., Benha U., Egypt.

4 Prof. and Deputy Director of Central Laboratory for Aquaculture Res., Egypt.

Abstract

The main aim of this work is to investigate to which extent the content of nutrients in water discharged from fish farms is sufficient for growing lettuce plants, in order to reduce the using of chemical fertilizers, save water, improve the plant and fish. To achieve that study the effect of different flow rate (1.0, 1.5 and 2.0 L h-1) and culture system (A shape, gutter and deep water) on root length, fresh and dry weight of shoot and root and nutrients uptake for lettuce plants in hydroponic and aquaponic systems. The obtained results indicated that the highest value of the length of root (26.93 cm) was found with waste fish farm for deep water hydroponic system. The fresh and dry of shoot and root for lettuce plants grown in gutter hydroponic system was better than those grown in different culture system with 1.5 L h-1 plant-1 flow rate. The highest values of N, P, K, Ca and Mg uptake were 2.86, 0.85, 3.20, 1.90 and 0.30 %, respectively, for all treatments. The total weight gain, fish growth rate and specific growth rate were 138.9 g, 2.78 g day­1 and 2.03 %, respectively.

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Main Subjects

References

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