Effects of the Aqueous Phase of Methane Fermentation on the Growth of Tomato Plants in Soil, Coconut Fiber, Rockwool and Hydroponic Culture

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  • メタン発酵消化液が養液土耕,やしがら耕,ロックウール耕および水耕におけるトマトの生育に及ぼす影響
  • メタン ハッコウ ショウカエキ ガ ヨウエキドコウ ヤ シガラコウ ロックウールコウ オヨビ スイコウ ニ オケル トマト ノ セイイク ニ オヨボス エイキョウ

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Abstract

Effects of the aqueous phase containing much NH_4^+-N and NaCl, produced by methane fermentation on the growth of tomato plants were evaluated in soil, coconut fiber, rockwool and hydroponic culture. Tomato plants were supplied with diluted aqueous phase (DAP), diluted and modified aqueous phase (DMAP), and commercial fertilizer (Otsuka Chemicals) and grown for 53 days in the greenhouse. In all cultural systems except the soil system, tomato plants supplied with the aqueous phase showed ammonium toxicity symptoms and the growth was reduced. In the soil system, tomato plants showed no toxicity symptoms and the growth was comparable to that in commercial fertilizer. As compared with DAP, plant growth was better in DMAP. Analytical data on leaves and the nutrient solution sampled from each medium indicated that NH_4^+-N concentration was low in the soil system. In the soil system, it was estimated that NH_4^+-N was nitrified and/or fixed and its toxic effects reduced. NaCl concentration in leaves was less than a toxic level in DMAP. However NaCl concentration in the nutrient solution sampled from each medium was increased in the latter growing period. And EC also increased with it. From the above results, we have a possibility to use the aqueous phase of methane fermentation as liquid fertilizer in soil system. On the other hand, the possibility that salt injury by accumulation of Na and Cl occurred was suggested when the aqueous phase was supplied for cultivation of a long term.

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