Analysis of Deep Groundwater in the Sambagawa Belt in Relation to Growth of Komatsuna (<I>Brassica rapa</I> var. <I>perviridis</I>)
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概要
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The quality of groundwater is essential to ensuring the sustainable use of water resources for irrigation. Deep groundwater samples were collected from the Sambagawa Belt in southeastern Japan, at 1,180 m (GW<SUB>deep</SUB>) and 50 m (GW<SUB>shallow</SUB>). Groundwater quality was assessed based on analysis of physicochemical parameters. The sodium adsorption ratio of groundwater fell in the range of 1.61–3.13, while electric conductivity of GW<SUB>deep</SUB> was high (›75.0 mS m<SUP>−1</SUP>). Experiments were performed to determine the effects of deep groundwater on germination and early growth of komatsuna (<I>Brassica rapa</I> var. <I>perviridis</I>). Strong inhibition (44% reduction) of root growth was observed with GW<SUB>deep</SUB> compared to the control treatment. In contrast, shoot length increased with increasing depth of the groundwater source. Comparison of the effects of GW<SUB>deep</SUB> and NaCl solution on growth of komatsuna revealed similar patterns at 1×10<SUP>3</SUP> mg L<SUP>−1</SUP> NaCl solution. Our findings suggested that deep groundwater can be used for irrigation of komatsuna, but not during the germination stage of this crop.
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