Articles
DEVELOPMENT OF VEGETABLE PRODUCTION SYSTEM BY PURIFICATION OF EUTHROPHIC TEGA-LAKE WATER
Article number
644_8
Pages
85 – 90
Language
English
Abstract
An efficiency of hydroponic systems aiming for high productivity and the purification of euthrophic Tega-lake water by growing water convolvulus was evaluated.
Three systems were set up inside and at lakeside.
A Raft system was constructed inside the lake, whilst DFT and NFT systems were constructed on the lakeside.
Water convolvulus (Ipomea aquatica) was used as plant material throughout the experiment.
Harvesting was performed repeatedly by cutting machine newly modified from tea cutting machine at 30 cm above the growing panels.
Plants were grown from the end of June 2000 to the end of October.
The productivity of lakeside system was higher than that of the raft system.
In the lakeside systems, as the water flow was inhibited by too thick root mat development in NFT, DFT seemed to be the better system for water convolvulus culture.
The total yield of DFT resulted even higher value than that of conventional greenhouse hydroponic culture.
These results suggested that water convolvulus could be grown using only the lake water as nutrient solution.
On the other hand, the absorbed ratio of N and P, water convolvulus in DFT showed higher value than annual grass.
The lakeside growing systems are expected to be one of applicable methods not only for the vegetable production but also for the purification of euthrophic lake water.
Three systems were set up inside and at lakeside.
A Raft system was constructed inside the lake, whilst DFT and NFT systems were constructed on the lakeside.
Water convolvulus (Ipomea aquatica) was used as plant material throughout the experiment.
Harvesting was performed repeatedly by cutting machine newly modified from tea cutting machine at 30 cm above the growing panels.
Plants were grown from the end of June 2000 to the end of October.
The productivity of lakeside system was higher than that of the raft system.
In the lakeside systems, as the water flow was inhibited by too thick root mat development in NFT, DFT seemed to be the better system for water convolvulus culture.
The total yield of DFT resulted even higher value than that of conventional greenhouse hydroponic culture.
These results suggested that water convolvulus could be grown using only the lake water as nutrient solution.
On the other hand, the absorbed ratio of N and P, water convolvulus in DFT showed higher value than annual grass.
The lakeside growing systems are expected to be one of applicable methods not only for the vegetable production but also for the purification of euthrophic lake water.
Authors
M. Takagaki, T. Maruo, Y. Shinohara
Keywords
water purification, water convolvulus, Ipomea aquatica, euthrophic, wetland
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